Evaluation of toxicity of five medicinal plant extracts on maize weevil, Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae) on stored maize

Fatematuzzjohora et al. / Int.J.Agr.Sci. & Tech. 1(2) (2021) 40-50 Page 40 of 50
Volume 1, Issue 2, May 2021
Received : 15 December 2020
Accepted : 19 April 2021
Published : 05 May 2021
doi: 10.51483/IJAGST.1.2.2021.40-50
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Abstract
The experiments were conducted in the laboratory of the Department of Entomology and
Department of Agricultural Chemistry, Hajee Mohammad Danesh Science and Technology
University (HSTU), Dinajpur during May-December 2017 to evaluate the toxicity of five
medicinalplant extracts (water hyacinth Eichhornia crassipes, swamp smartweedPolygonum
coccineum, ariach Cassia tora, wild capsicum Croton bonplandianum and hill glory bower
Clerodendrum viscosum) against maize weevil, Sitophilus zeamais (Mots.) on stored maize.
The wild capsicum extract provided the highest average mortality (93.33 ± 3.33), following
the hillglorybower (86.67 ±3.33) and swampsmartweed(86.67 ± 3.33) at 3% concentration.
But it was zero in control. The average numbers of lowest numbers of adult emergence
among the five weed extracts were found in wild capsicum (3.00 ± 0.39) following Swamp
smartweed (5.11 ± 0.95) at 3% concentration; whereas, in control it was (54.00 ± 1.15).
The lowest percent of seed damage were found in wild capsicum (3.00 ± 0.38%) following
Swamp smartweed (4.22 ± 0.58). But in control, it was 44.00 ± 1.15. Repellency class of
different plant extracts at different concentration level varied between I to IV. But the hill
glory bower at 3.0% showed statistically best as it showed the highest repellency rate was
66.0 ± 5.31% and the group were IV. However, the toxicity order was wild capsicum >
swamp smartweed > hill glory bower > water hyacinth >, ariach.
Keywords: Toxicity, Medicinal plant, Extracts, Sitophilus zeamais (Mots.)
* Corresponding author: Md. Abdul Ahad, Department of Entomology, Faculty of Agriculture, Hajee Mohammad Danesh Science and
Technology University, Dinajpur 5200, Bangladesh. E-mail: maahadhstu@gmail.com
2710-3366/© 2021. International Journal of Agricultural Sciences and Technology. All rights reserved.
Evaluation of toxicity of five medicinal plant extractson maize weevil,
Sitophilus zeamais (Mots.) (Coleoptera:Curculionidae)on storedmaize
Fatematuzzjohora1
, Md. Abdul Ahad2*
, Most. Rubiya Khatun3
and M. A. Hossain4
1
MS Student, Department of Entomology. Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur-
5200, Bangladesh. E-mail: fatem.zohora@gmail.com
2
Professor, Dept. of Entomology, Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200,
Bangladesh. E-mail: maahadhstu@gmail.com
3
MS Student, Department of Fisheries University of Rajshahi, Bangladesh. E-mail: rubiyakhatun259@gmail.com
4
Professor, Department of Entomology, Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur-
5200, Bangladesh. E-mail: alamgirhstu@gmail.com
1. Introduction
Among the foods of human being the stored grains are main food (Padin et al., 2002). But stored product insect caused
post harvest losses up to 9% in developed countries to 20% over more in developing countries every year (Phillips and
Throne, 2010). Storage loss is one of the major problems in developing countries like Bangladesh as well as all over the
world. In Bangladesh, the annual grain loss cost as over taka 100 crores (Alam, 1971). It is also reported that more than
70% of cereal production is stored in farms level in developing countries (Kavita, 2004). The infestation of pests creates
a serious problem in grain stocking and its derived industry(Perez et al., 2004).
Several species of insects may infest the grain in storage. There are over 200 major species of insects and mites
infesting important crops and stored products (Das, 1998). However, the principal pests of stored grains that causes
ISSN: 2710-3366
Fatematuzzjohora et al. / Int.J.Agr.Sci. & Tech. 1(2) (2021) 40-50
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damages by the adult and larva stage of the beetles and moths. There is a continuous need to protect the stored
products against deterioration, especiallyloss of qualityand weight during storage. Quantitative and qualitative losses
of stored products may result from the feeding by insects, mites, birds, rodents and or from the development of
microorganisms all of which are influenced by environmental conditions (Mohale et al., 2010).
Maize (Zea mays L: Gramineae) is a major staple crop for manysmallholder farmers over the world. Human maize
consumption has an increasing trend due to global population growth and its alternative uses that include; animal feed,
fiber, and ethanol production. The demand for maize as feed ingredient is growing fast in Bangladesh. It has been
observed that maize production is highly concentrated especially in Dinajpur, Rangpur and Bogra districts (Quasem,
1999). According to Kearney (2010), maize consumption has been increasing and it will reach its peak by 2050 due to
industrial countries and as feedstock for biofuels. Maize, being cheaper than other cereals such as rice and wheat, is
used as a commodityfor food aid in developing countries. However, maize weevil, Sitophilus zeamais (Motsch.) is one
of the most serious cosmopolitan pest of stored cereal grain, especially of maize (Zea mays L.), in tropical and sub-
tropical regions (Throne, 1994). In stored maize, heavyinfestation of this pest maycause weight losses of as much as 30-
40% (Casey, 1994).
Presently, chemical control is the main emphasis tocontrol this weevil. Synthetic chemical insecticides and fumigants
have been applied tocontrol maize weevil in store (Udo, 2005;Abebeet al., 2009; Pereira et al., 2009; Nukenine, 2010).
But chemical control of insect pests in storage has serious drawbacks (Sahayaraj, 1994; Khanam et al., 1990; Haque and
Hussain, 1993). However, the use of insecticides to control of maize weevil is being threatened by development of maize
weevil resistance (Fragoso et al., 2005; Pereira et al., 2009) and the chemical products are also mostly beyond the reach
ofsmallholder farmers (Dhliwayoand Pixley, 2003). To prevail over these problems, alternatives to chemical pesticides
for controlling insect pest ofstorage are necessary. Plant based botanical pesticides can be effective and safe, which are
locally available, less hazardous with low toxicity. In addition, plant-based pesticides are renewable in nature and
cheaper (Heyde et al., 1983). Moreover plant-derived pesticides can be transferred intopractical applications in natural
crop protection, which can help the small-scale farmers (Binggeli, 1999). Manybotanical extracts contain various types
of bioactive ingredients and chemicals which are toxic to stored product insects including S. zeamais. However, there
are many research work done on the evaluation of different indigenous plant extracts against stored product pest
(Pandey and Brave, 2011 and Arya and Tiwari, 2013). Under these circumstances, an investigation was undertaken to
determine the toxicity, repellency and residual effects of leaf extracts of some weed plants such as (i) water hyacinth
(Eichhornia crassipes), (ii) swamp smartweed (Polygonum coccineum), (iii) ariach (Cassia tora), (iv) wild capsicum
(Croton bonplandianum), and (v) hill glory bower (Clerodendrum viscosum) against S. zeamais Motsch. These weed
plant are valueless, create disturb to crop plant, less toxicant to the mammals and available to farmers in any part of
Bangladesh. So, it is a cheapest method of pest management. Beside weed extracts, an insecticide has been used in this
experiment to evaluate its toxicitylevel on maize weevil. The use of synthetic chemicals as a method of controlling pests
is effective yet expensive, dangerous to human health and may create other problems in post harvest industry. So, the
specific objectives ofthe present research works to evaluate the toxicityweed extracts through the direct toxic effect and
residual effect by (a) adult emergence test, (b) seed damage test and, (c) the repellency test against maize weevil, S.
zeamais Motsch.
2. Materials and methods
The experiments were conducted in the laboratory of the Department of Entomology and Department of Agricultural
Chemistry, Hajee Mohammad Danesh Science andTechnologyUniversity(HSTU), Dinajpur, Bangladesh from Mayto
E . crassipes P. coccineum C. tora C. bonplandianum C. viscosum

December 2017. Insect cultures were maintained in the laboratoryat room temperature (30 ± 2 °C and with 70 ± 5% RH)
during the experiments. Leaves of water hyacinth (Eichhornia crassipes), swamp smartweed (Polygonum coccineum),
ariach (Cassia tora), wild capsicum (Croton bonplandianum) and bhat (Clerodendrum viscosum) were collected from
HSTUCampus. These collected materials were washed in running tap water and then air-dried. Finally, the dried plant
materials were powdered bythe Mortar.
3. Preparation of weed extracts
The leaf powder of100 g ofeach was taken separatelyin 1.5 liter separated funnel and 130 ml n-hexane were added and
kept for 72 h with interval of shaking. After 72 h it was then filtered byWhatman paper No.1 (diameter 40). Then the
aqueous extracts were collected in beakers.
4. Isolation of crude extracts
After collecting the aqueous extracts into the beaker, the solvents were evaporated byusing thin film rotaryevaporator
under reduced pressure. The condensed crude extracts were then preserved in tightly corked vials and stored in a
refrigerator at 4 °C for further investigation.
5. Preparation of doses
The crude extracts were weighted in the electronic balance and dissolved in hexane solvent for making different
concentrations (0.5, 1.0, 2.0and 3.0% w/v) ofweed extracts and the chemical insecticide at different concentrations (0.01,
0.1 and 0.2% w/v) were prepared along with control (Plate 4). Prior toconducting the study, a pilot experiment was done
to obtain the appropriate dose.
5.1. Rearing of test insects and maintenance
The maize weevil, S. zeamais was used for the present experiments. Small populations ofweevils were obtained from the
entomologylaboratorystock. Theywere reared in the laboratoryat room temperature (30 ± 2 °C and with 70 ± 5% RH)
on maize seedsin a Jar (28cm × 13cm). Initially, 50 pairs of1-2 day-old adults wereplaced in a jar containingmaize seeds.
The jar was sealed with net cloth and a maximum of seven days were allowed for mating and oviposition. Then parent
stocks were removed and maize seeds containing eggs were transferred to fresh maize seeds in another jar and again
covered with pieces of a net cloth fastened with rubber bands to prevent the contamination and escape of insects. The
subsequent progenies of the weevils were used for all the experiments.
5.2. Direct toxicity test
The residual film method describes by Busvine (1971) was used to toxicity test of different weed extracts against the
adult of maize weevil. Different concentrations (0.5, 1.0, 2.0 and 3.0% w/v) of weed extractswere made and 1 ml liquid of
each dose was dropped separately on the petridishes (60 mm) with the help of pipette. Then the plant extracts were
covered uniformlyto the whole area of the petri dishes internally. The petri dishes were then kept open for sometimes to
evaporate the solvent fully. Two days old 10 adult weevils from stock culture were released in each petri dish. The
control petri dishes were treated with n-hexane solvent only. Three replications were made for each concentration of
plant extracts including control treatment. The Petri-dishes were then kept without food. Insect mortality was recorded
at 24, 48, and 72 hours after treatment (HAT). The percentage of mortalitywas corrected usingAbbott’s formula (Abbott,
1987).
100
100





C
C
p
P
where, P = Percentage of corrected mortality
P’ = Observed mortality(%)
C = Mortality (%) at control.
5.3. Residual toxicity effect
Theweed extracts weremixed with maize seedat the rate of0.5%, 1%, 2% and 3% (w/v). The treated maizeseeds wereair
dried for 20 min and then put intoseparate plastic pots (6 × 7 cm2
), sothat each pot contained 30 gm of maize seeds. Five-
day-old weevils of 5 pairs were released into the plastic pot. After seven days, dead and alive weevils were removed from
each pot and kept the pots undisturbed in the laboratory for the emergence of new adult weevils.

5.4. Adult emergence inhibition rate
The maize weevils were started to emerge after 36-40 days of egg laying. The emerged weevils were counted and
removed after 40, 47, and 54 days after the experiment set up. The adult emergence rate was recorded and the inhibition
rate (IR %) was calculated byusing the following formula as stated byTalukder and Howse (1993).
IR (%) = Cn – Tn/Cn × 100
where, Cn = Number of insects in control plastic pot.
Tn = Number of insects in treated plastic pot.
5.5. Seed damage inhibition rate
The seed was taken out from the pot to determine the hole(s) on each seed carefully. Seeds containing hole(s) were
considered as damaged seeds. The numbers of damaged seeds were counted from the random sample of 100 seeds at the
end of the experiment and were recorded for each replication. Then inhibition rate (DI %) was calculated by using the
following formula byTalukder and Howse (1993).
DI (%) = Cn – Tn/Cn × 100
where, Cn = Number of damaged seeds in control plastic pot.
Tn = Number of damaged seeds in treated plastic pot.
5.6. Repellency test
The repellency test was conducted according to the method of Talukder and Howse (1993). For this test, respective
doses oftested plants extracts (0.5, 1.0, 2.0 and 3.0% w/v extract and 0.01, 0.1 were prepared. The filter paper (Whatman
no. 1) was cut into two half, and 1 ml solution of each concentration was applied to one half uniformly with the help of
micropipette. The treated and control filter papers then air dried for 20 min to evaporate the solvent completely. With the
help ofa pipette, 1.0 ml solutions of each plant extract were applied toone halfofthe petri dish (90 mm). The treated half
was then air-dried and was attached with the untreated half. Ten weevils of five days old were released at the centre of
each petri dish and a cover was placed on the petri dish. There were three replications for each plant extract and each
dose. Then the insects present on each portion were counted at hourly intervals up to fifth hour. The data were
expressed as percentage repulsion (PR) bythe following formula:
PR (%) = (NC – 50) × 2
where, NC = The percentage of insects present in the control half.
Positive (+) values expressed repellency and negative (–) values attractions. Data (PR %) was analyzed using
Analysis of Variance (ANOVA). The average values were then categorized according tothe following scale (McDonald
et al., 1970).
Class Repellency (%)
0 0 > 0.01 to 0.1
I 0.1 to 20
II 20.1 to 40
III 40.1 to 60
IV 60.1 to 80
V 80.1 to 100

6. Statistical analyses
The data obtained from the experiments were statisticallyanalyzed byMSTAT and SPSS computer program following
Completely Randomized Design (CRD) method. The significance of the mean differences was tested by DMRT. The
observed mortality was also subjected to probit analysis.
7. Results and discussion
The experiment was conducted to find out the acute and lethal effect of five indigenous weed extracts (water hyacinth
(Eichhornia crassipes), swamp smartweed (Polygonum coccineum), ariach (Cassia tora), wild capsicum (Croton
bonplandianum) and bhat (Clerodendrum viscosum) were against maize weevil (S. zeamais). The outcomes of the
experiment are presented and discussed under the following sub-headings.
7.1. Direct toxicity effect of different plant extracts against the adult of S. zeamais
The direct toxicityeffect based % mortalityof different plant extracts at doses different time intervals against the adult
S. zeamais are presented in theTable 1. Mortalityofmaize weevil also differed significantlyamong all the concentrations
Table 1: Direct toxic effect of different weed extracts and doses against S. zeamais at different HAT
(Interaction of plant, dose and time)
Plant extracts Doses (%)
Insect mortality (%) at different time intervals Average mortality (%)
24 HAT 48 HAT 72 HAT
Water hyacinth 0.5 3.33 ± 3.33 gh 6.67 ± 3.33 gh 16.67 ± 3.33 g 8.867 ± 2.94 gh
1.0 6.667 ± 3.33fgh 13.33 ± 3.33 fgh 33.33 ± 3.33 ef 17.77 ± 2.23 g
2.0 13.33 ± 6.67efg 40.00 ± 5.773 de 60.00 ± 0.00 d 37.77 ± 3.99 de
3.0 26.67 ± 3.33bcd 66.67 ± 3.33 bc 80.00 ± 0.00bc 57.77 ± 2.23 b
Swamp smartweed 0.5 3.333 ± 3.33 gh 3.33 ± 3.33 h 23.33 ± 3.33fg 10.00 ± 1.91 gh
1.0 3.33 ± 3.33 gh 23.33 ± 3.33 efg 60.00 ± 5.77 d 28.90 ± 2.20 ef
2.0 10.00 ± 5.77fgh 30.00 ± 10.00 ef 80.00 ± 5.77bc 40.00 ± 5.77 cd
3.0 33.33 ± 3.33 bc 53.33 ± 3.33 cd 86.67 ± 3.33ab 57.80 ± 1.10 b
Ariach 0.5 3.33 ± 3.33 gh 3.33 ± 3.33 h 20.00 ± 5.77 g 8.90 ± 4.00 gh
1.0 3.33 ± 3.33 gh 16.67 ± 3.33 fgh 40.00 ± 3.33 e 20.03 ± 5.77 fg
2.0 6.67 ± 6.67 fgh 36.67 ± 17.64 de 80.00 ± 5.77bc 41.13 ± 9.87 cd
3.0 16.67 ± 3.33def 40.00 ± 5.77 de 80.00 ± 5.77bc 45.53 ± 3.99 cd
Wild capsicum 0.5 23.33 ± 3.33cde 56.67 ± 8.82 bc 70.00 ± 5.77cd 50.00 ± 5.09 bc
1.0 36.67 ± 6.67 b 60.00 ± 5.77 bc 76.67 ± 3.33bc 57.77 ± 3.99 b
2.0 66.67 ± 3.33 a 73.33 ± 3.33 ab 86.67 ± 3.33ab 75.53 ± 2.23 a
3.0 73.33 ± 3.33 a 83.33 ± 3.33 a 93.33 ± 3.33 a 83.33 ± 1.93 a
Hill glory bower 0.5 3.33 ± 2.94 gh 3.33 ± 3.33 h 23.33 ± 3.33fg 10.03 ± 3.33 gh
1.0 3.33 ± 3.33 gh 6.67 ± 3.33 gh 36.67 ± 3.33 e 15.57 ± 3.33 g
2.0 10.00 ± 5.77fgh 23.33 ± 3.33 efg 76.67 ± 3.33bc 36.67 ± 3.33 de
3.0 16.67 ± 3.33def 30.00 ± 5.77 ef 86.67 ± 3.33ab 44.47 ± 3.99 cd

Table 1 (Cont.)
Insect mortality (%) at different time intervals Average mortality (%)
24 HAT 48 HAT 72 HAT
Control 0.00 ± 0.00 h 0.00 ± 0.00 h 0.00 ± 0.00 h 0.00 ± 0.00 h
LSD 10.88 15.73 10.71 10.10
CV % 45.64 35.79 13.50 20.58
Note: HAT= Hours After Treatment; Within column values followed by different letter(s) are significantly different by DMRT at
5% level of probability.
level at different time intervals. However, the average mortality percentage differed statistically among all the plant
extracts. Mortality percentages were increased proportionally with the increased time intervals. The wild capsicum
extract provided the highest average mortality (93.33 ± 3.33), following the hill glory bower (86.67 ± 3.33) and swamp
smartweed (86.67 ± 3.33) at 3% concentration at 72 h. But mortality was zero. in the control, On the basis of insect
mortality the order of the toxic effect of five tested weed extracts against maize weevil were found of wild capsicum >
swamp smartweed > hill glorybower > water hyacinth > ariach.
7.2. Residual effects of weed extracts against maize weevil
(a) On the basis of inhibition of adult emergence: The result of residual toxic effects based on the average numbers of
adult emergence five weed extract (of water hyacinth, swamp smartweed, ariach, wild capsicum and hill glorybower on
S. zeamais at different days after treatment (DAT) are presented in Table 2. The average numbers of adult emergence
Table 2: Residual toxicity on adult emergence and inhibition against S. zeamais treated with weed extracts and
doses at different DAT
Mean number of adult emergence (DAT)
Average IR(%)
40 DAT 47 DAT 54 DAT
Water hyacinth 0.5 15.00 ± 1.15 c 24.67 ± 1.45 c 33.67 ± 1.20 c 24.45 ± 0.399 c 54.73 ± 0.74 g
1.0 11.67 ± 1.20 de 16.67 ± 0.88 f 28.00 ± 1.53 ef 18.78 ± 0.99 e 65.22 ± 1.83 e
2.0 7.00 ± 1.15 g 12.00 ± 1.15 ghi 22.67 ± 1.45 gh 13.89 ± 1.25 fgh74.28 ± 2.31cd
3.0 2.33 ± 0.33 i 4.67 ± 0.33 k 9.00 ± 0.58 kl 5.33 ± 0.33j 90.12 ± 0.62 a
Swamp smartweed 0.5 13.67 ± 0.88 cd 21.00 ± 0.58 de 32.67 ± 1.45 cd 22.44 ± 0.68 c 58.44 ± 1.25g
1.0 11.33 ± 0.67 de 17.67 ± 0.33 ef 29.33 ± 1.20cde 19.44 ± 0.29 de 63.99 ± 0.54ef
2.0 6.00 ± 0.58 gh 11.67 ± 0.88 hi 19.33 ± 0.88 hi 12.33 ± 0.69 gh 77.16 ± 1.28 c
3.0 2.00 ± 0.58 i 5.67 ± 1.20 jk 7.67 ± 1.45 kl 5.11 ± 0.95 j 90.53 ± 1.76 a
Ariach 0.5 19.33 ± 0.88 b 31.33 ± 0.88 b 41.00 ± 4.04 b 30.55 ± 1.89 b 43.42 ± 3.52 h
1.0 12.00 ± 0.58 de 17.67 ± 1.45 ef 28.33 ± 1.45 de 19.33 ± 1.07 de 64.19 ± 1.98 ef
2.0 7.67 ± 1.45 fg 15.00 ± 1.53 fgh 20.67 ± 1.76 gh 14.45 ± 1.35 fgh 73.25 ± 2.51cd
3.0 7.00 ± 0.58 g 9.00 ± 1.15 ij 11.67 ± 2.33 jk 9.223 ± 1.35 i 82.92 ± 2.51 b
Wild capsicum 0.5 14.00 ± 1.15 cd 18.33 ± 1.20 ef 23.67 ± 0.67fgh 18.67 ± 0.84 e 65.43 ± 1.56 e
1.0 12.00 ± 0.58 de 15.33 ± 0.88 fg 19.67 ± 0.88 hi 15.67 ± 0.58 f 70.98 ± 1.07 d

Table 2 (Cont.)
Mean number of adult emergence (DAT)
Average IR(%)
2.0 6.67 ± 0.88 g 9.00 ± 0.58 ij 11.00 ± 0.58 jk 8.89 ± 0.40 i 83.53 ± 0.74 b
3.0 1.00 ± 0.00 i 2.667 ± 0.33 k 5.33 ± 0.88 l 3.00 ± 0.39 j 94.44 ± 0.72 a
Hill glory bower 0.5 18.00 ± 0.58 b 22.67 ± 1.45 cd 25.00 ± 1.15 efg 21.89 ± 1.06 cd 59.46 ± 1.96 fg
1.0 10.33 ± 0.88 ef 16.00 ± 1.00 f 19.67 ± 0.88 hi 15.33 ± 0.88 fg 71.60 ± 1.63 d
2.0 8.33 ± 0.88 fg 11.33 ± 1.20 i 15.33 ± 0.67 ij 11.67 ± 0.88 hi 78.39 ± 1.63 bc
3.0 3.67 ± 1.20 hi 5.67 ± 0.67 jk 7.67 ± 0.33 kl 5.67 ± 0.67 j 89.50 ± 1.24 a
Control 49.67 ± 1.20 a 53.67 ± 1.45 a 58.67 ± 1.33 a 54.00 ± 1.15 a -
LSD 2.70 3.20 4.16 2.80 4.97
CV % 9.43 8.78 8.99 7.54 4.15
Note: DAT= Days After Treatment; Within column values followed by different letter(s) are significantly different by DMRT at
among all the weed extracts in all level of concentrations were statisticallysignificant. However, the lowest numbers of
adult emergence among the five weed extract wasfound in wildcapsicum (3.00 ± 0.39 )following Swamp smartweed (5.11
± 0.95 ), Water hyacinth (5.33 ± 0.33j), and Hill glory bower (5.67 ± 0.67), ariach (9.223 ± 1.35), respectively; whereas in
control it was 54.00±1.15 (Table 2). The lowest numbers of adult emergence means the highest toxicity. So, those extract
were best respectivelyfor the control of maize weevil, S. zeamais. On the basis of inhibition of adult emergence the order
of the toxic effect of five tested weed extracts against maize weevil were found of wild capsicum > swamp smartweed >
water hyacinth > hill glorybower.
The results ofpresent studyare more or less similar tothat of Bosa (2014). From the maize-amaranth experiment, he
concluded that blending maize with amaranth during storage reduced maize weevil population growth by46% compared
tostoring maize alone.
(a)On the basis of seed damage andinhibition against S. zeamaistreatedwith different weedextracts
The result of % seed damage of water hyacinth, swamp smartweed, ariach, wild capsicum and hill glory bower plant
extracts on S. zeamais at different DAT are presented in Table 5. The average the percentage of seed damage inhibition
among the entire weed extracts in all level the concentrations were statisticallysignificant. However, the lowest percent
ofdamage was foundin wild capsicum (3.00 ± 0.38%) following Swamp smartweed (4.22 ± 0.58), Water hyacinth (4.89 ±
0.11), andnext Hill glorybower (4.89 ±0.11), ariach (8.22 ± 0.78). But in control it was 44.00 ±1.15 (Table 3). The lowest
% seed damage means the highest toxicity. So, those extract were preformed best for check the damage of seed.
However, on the basis of % seed damage the order of the toxic effect of five tested weed extracts against maize weevil
were found of wild capsicum > swamp smartweed > water hyacinth > hill glorybower > ariach.
Table 3: Residual toxicity based on seed damage % against S. zeamais treated with weed extracts and doses at
different DAT
Mean number of seed damage (DAT)
Average DI(%)
Water hyacinth 0.5 12.33 ± 0.88 cd 18.67 ± 1.33 c 24.67 ± 1.20 c 18.55 ± 0.39c 57.83 ± 0.91i
1.0 10.33 ± 0.88 def 13.33 ± 0.67fg 18.67 ± 0.67defg 14.11 ± 0.62e 67.93 ± 1.40fg

7.3. Repellent effect of different weed extracts against the adult of S. zeamais
Thepercent ofmean repellent rate(1h,2h, 3h,4h and5h)effectoffiveweed(water hyacinth,swampsmartweed, ariach,wild
capsicum and hill glorybower) in n-hexanesolvent extracts against theadult ofS. zeamaisispresentedin Table4. Data were
statisticallysignificant ofeach treatment (p< 0.05). Therepellencyclass ofdifferent plant extractsat different concentration
level varied between I toIV. Among the five weed extracts tested, the hill glorybower at 3.0% showed statistically best as it
showedthehighest repellencyratewas66.0 ±5.31%andgroup wasIV.Thenext highestrepellencygroupwas waterhyacinth,
swampsmartweed andariach; therepellencyratewas56.00± 8.00, 54.70± 8.1%and48± 1.4%, respectivelyat 3.0%andthe
groupofthoseweedextract were III.Therest group wasIandII at1%and2% of all thetestedweed plant (Table4). However,
on thebasis of Repellent effect the order ofthetoxiceffect offivetestedweedextracts against maizeweevil werefound of hill
glorybower >waterhyacinth >,swampsmartweed> wildcapsicum > ariach.Thestudyof repellenteffect of weedextractswas
also agreed by the observation of Waliullah et al. (2014). The repellent activity was done using ethyl alcohol fraction of
Table 3 (Cont.)
Mean number of seed damage (DAT)
Average DI(%)
2.0 6.67 ± 0.88 hi 9.00 ± 0.58 hi 15.00 ± 0.58 ghi 10.22 ± 0.67 f 76.77 ± 1.53e
3.0 2.33 ± 0.33 kl 4.33 ± 0.33 kl 8.00 ± 0.58 klm 4.89 ± 0.11 ij 88.88 ± 0.25b
Swamp smartweed 0.5 11.67 ± 0.88 de 17.00 ± 0.58 cd 21.67 ± 0.88cde 16.78 ± 0.48 cd 61.86 ± 1.10 hi
1.0 9.00 ± 0.58 fg 13.33 ± 0.67 fg 18.00 ± 0.58efgh 13.44 ± 0.11e 69.44 ± 0.26 fg
2.0 5.00 ± 0.58 ij 9.67 ± 0.88 hi 13.00 ± 0.58 ij 9.22 ± 0.62 fg 79.03 ± 1.41cde
3.0 1.67 ± 0.33 kl 4.67 ± 0.88 kl 6.33 ± 0.88 lm 4.22 ± 0.58 ij 90.40 ± 1.34 ab
Ariach 0.5 15.33 ± 0.88 b 26.00 ± 0.58 b 35.67 ± 2.18 b 25.67 ± 1.17b 42.49 ± 1.84 j
1.0 11.67 ± 0.33 de 16.33 ± 0.88cde 22.00 ± 1.15 cd 16.67 ± 0.77cd 62.12 ± 1.75hi
2.0 7.67 ± 1.45 gh 12.67 ± 1.20 fg 17.33 ± 1.45fgh 12.55 ± 1.18 e 71.47 ± 2.67f
3.0 6.33 ± 0.33 hi 8.00 ± 0.58 ij 10.33 ± 1.45 jk 8.22 ± 0.78 fg 81.31 ± 1.77cd
Wild capsicum 0.5 11.33 ± 0.88 de 15.00 ± 0.58 def 18.67 ± 0.67defg 15.00 ± 0.51de 65.90 ± 1.16 gh
1.0 10.00 ± 0.58 ef 11.67 ± 0.88 gh 16.00 ± 0.58 ghi 12.56 ± 0.48e 71.46 ± 1.09 f
2.0 5.33 ± 0.33 ij 7.67 ± 0.33 ij 9.33 ± 0.33 kl 7.47 ± 0.22gh 83.07 ± 0.51 c
3.0 1.00 ± 0.00 l 2.67 ± 0.33 l 5.33 ± 0.88 m 3.00 ± 0.38 j 93.18 ± 0.88 a
Hill glory bower 0.5 14.00 ± 0.58 bc 18.00 ± 1.53 c 20.67 ± 1.20 def 17.56 ± 1.06c 60.10 ± 2.40 i
1.0 10.33 ± 0.88 def 14.00 ± 0.58 efg 14.67 ± 0.33 hi 13.00 ± 0.51e 70.45 ± 1.16 f
2.0 7.00 ± 0.58 ghi 9.33 ± 0. 33 hi 13.33 ± 0.67 ij 9.89 ± 0.40 f 77.52 ± 0.91 de
3.0 3.33 ± 0.88 jk 5.67 ± 0.67 jk 7.67 ± 0.33 klm 5.57 ± 0.56 hi 87.37 ± 1.26 b
Control 40.67 ± 0.67 a 44.00 ± 1.15 a 47.33 ± 1.76 a 44.00 ± 1.15a -
LSD 2.031 2.48 3.34 2.21 4.05
CV % 8.47 8.28 9.19 7.35 3.36
Note: DAT= Days After Treatment; Within column values followed by different letter(s) are significantly different by DMRT at

Clerodendrumviscosum. All the extracts(root, leafand stem)showed100% repellency(ClassVcategoryrepellency) in dose
no1 todose no 5 except stem. The degree ofrepellencyresponse among the three parts oftest insect was significantlydiffer
(p< 0.05).About similar results alsofoundbyAhadet al., 2016a andAhadet al., 2016b.
Table 4: Repellent effect of different weed extracts at different doses against S. zeamais using treated and
untreated filter paper at different HAT
Plant Doses
Repellency rate %
% Mean Rep.
extracts (%)
1 HAT 2 HAT 3 HAT 4 HAT 5 HAT
repell. Cla.
Water 0.5 13.33 ± 6.67bcd 13.33 ± 13.33cd 6.667 ± 6.67d 20.00 ± 11.55cde 26.67 ± 6.67bcd 16.00 ± 4.62fg I
hyacinth
1.0 13.33 ± 6.67bcd 6.667 ± 6.67d 40.00 ± 11.55abcd 13.33 ± 6.67de 33.33 ± 6.67abcd 21.33 ± 1.33defg II
2.0 33.33 ± 6.67bcd 13.33 ± 6.67cd 20.00 ± 11.55bcd 53.33 ± 6.67bc 73.33 ± 6.67a 38.67 ± 5.82bcde II
3.0 33.33 ± 13.3bcd 60.00 ± 20.00ab 53.33 ± 6.67ab 66.67 ± 13.33ab 66.67 ± 6.67ab 56.00 ± 8.00ab III
Swamp 0.5 6.67 ± 6.67cd 6.67 ± 6.67d 6.67 ± 6.67d 13.33 ± 6.67de 13.33 ± 6.67cd 9.33 ± 1.33g I
smart
1.0 6.67 ± 6.67cd 6.67 ± 6.67d 13.33 ± 6.67cd 6.67 ± 6.67e 26.67 ± 13.33bcd 12.00 ± 2.31fg I
weed
2.0 6.67 ± 6.67cd 33.33 ± 6.67abcd 33.33 ± 13.33abcd 40.00 ± 0.000bcde 33.33 ± 24.04abcd 29.33 ± 4.81cdefg II
3.0 40.00 ± 11.55abcd 66.67 ± 6.67a 53.33 ± 17.64ab 46.67 ± 6.67bcd 66.67 ± 6.67ab 54.67 ± 8.11ab III
Ariach 0.5 13.33 ± 6.67bcd 6.67 ± 6.67d 40.00 ± 11.55abcd 26.67 ± 6.67cde 6.67 ± 6.67d 18.67 ± 4.81efg I
1.0 0.00 ± 0.00d 20.00 ± 11.55cd 40.00 ± 11.55abcd 33.33 ± 6.67bcde 40.00 ± 20.00abcd 26.67 ± 7.06defg II
2.0 53.33 ± 29.06abc 40.00 ± 0.00abcd 20.00 ± 11.55bcd 33.33 ± 17.64bcde 13.33 ± 13.33cd 32.00 ± 4.00cdef II
3.0 26.67 ± 17.64abcd 60.00 ± 23.09ab 66.67 ± 17.64a 66.67 ± 24.04ab 20.00 ± 11.55cd 48.00 ± 14.05abc III
Wild 0.5 20.00 ± 0.00bcd 13.33 ± 6.67cd 6.67 ± 6.67d 13.33 ± 6.67de 33.33 ± 17.64abcd 17.33 ± 3.53fg I
capsicum
1.0 33.33 ± 24.04abcd 6.67 ± 6.67d 13.33 ± 13.33cd 53.33 ± 6.67bc 13.33 ± 13.33cd 24.00 ± 0.00defg II
2.0 60.00 ± 30.55ab 13.33 ± 13.33cd 53.33 ± 6.67ab 20.00 ± 0.00cde 53.33 ± 13.33abc 40.00 ± 6.93bcd II
3.0 13.33 ± 6.67bcd 20.00 ± 11.55cd 13.33 ± 6.67cd 40.00 ± 0.00bcde 73.33 ± 6.67a 32.00 ± 4.62cdef II
Hill 0.5 13.33 ± 6.67bcd 20.00 ± 0.00cd 26.67 ± 17.64bcd 20.00 ± 20.00cde 26.67 ± 6.67bcd 21.33 ± 5.82defg II
glory
1.0 33.33 ± 17.64abcd 26.67 ± 17.64bcd 46.67 ± 6.67abc 53.33 ± 6.67bc 40.00 ± 20.00abcd 40.00 ± 4.62bcd II
bower
2.0 33.33 ± 6.67abcd 46.67 ± 6.67abc 53.33 ± 6.67ab 46.67 ± 17.64bcd 13.33 ± 6.67cd 38.67 ± 8.11bcde II
3.0 73.33 ± 13.33a 63.33 ± 14.53ab 46.67 ± 6.67abc 93.33 ± 6.67a 53.33 ± 6.67abc 66.00 ± 3.06a IV
LSD 39.97 32.10 31.31 31.31 35.14 17.09
CV% 91.98 71.60 58.08 49.93 58.60 32.26
Note: HAT = Hours After Treatment; Mean followed by different letter(s) are significantly different by DMRT at 5% level of
probability.
8. Conclusion
Based on the toxicityweed extracts through the direct toxic effect and residual effect (byadult emergence test and seed
damage test and, against maize weevil, S. zeamais Motsch. wild capsicum was best and next was the swamp smartweed
at 3%. However, the toxicity order was wild capsicum (Croton bonplandianum) > swamp smartweed (Polygonum
coccineum) > hill glory bower (Clerodendrum viscosum) > water hyacinth (Eichhornia crassipes) > ariach (Cassia
tora).

Acknowledgment
The authors sincerelyacknowledge the Institute of Research and Training (IRT), Hajee Mohammad Danesh science and
TechnologyUniversity, Dinajpur, Bangladesh for its financial (17-18) supports for the research work.
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Cite this article as:Fatematuzzjohora, Md.AbdulAhad, Most. Rubiya Khatun and M.A. Hossain (2021). Evaluation
oftoxicityoffive medicinal plant extracts on maize weevil, Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae)
on stored maize. International Journal of Agricultural Sciences and Technology. 1(2), 40-50. doi: 10.51483/
IJAGST.1.2.2021.40-50.

Evaluation of toxicity of five medicinal plant extracts on maize weevil, Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae) on stored maize

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