A number of insect pests are known to infest fruits of guava in India. The most important pest is... more A number of insect pests are known to infest fruits of guava in India. The most important pest is fruitflies (Bactrocera dorsalis, B. zonata and B. correcta) followed by the next report of the fruit borers (Conogethes punctiferalis and Deudorix isocrates). However, the experiment was conducted on seasonal incidence of fruit borers on guava cv. Taiwan white at the College of Horticulture and farmer's orchard, Venkataramannagudem-West Godavari during 2019-2020. The peak larval population of guava fruit borer Conogethes punctiferalis (4.50 larvae/tree) and its fruit infestation (32.79%) was found in 9th Standard Mean Week of 2020. The highest incidence and infestation of Deudorix isocrates was recorded in 5 th Standard Mean Week of 2020 (4.25 larvae/tree and 30.80 per cent fruit infestation). The maximum and minimum temperature was negatively correlated and relative humidity is having positively correlation with the incidence of fruit borers whereas, rainfall was negatively correlated with the incidence of Conogethes punctiferalis and positively correlated with incidence of Deudorix isocrates.
An experiment was carried out to screen nine determinate Indian bean varieties viz., Arka Vijay, ... more An experiment was carried out to screen nine determinate Indian bean varieties viz., Arka Vijay, Arka Jay, Arka Amogh, Arka Soumya, Arka Sambharam, NIB-1, Konkan Bhushan, Tirupathi Local and West Godavari Local were screened to know the infestation of spotted pod borer, M. vitrata under open field conditions revealed that among the nine determinate Indian bean varieties NIB-1(17.75 %) considered as highly resistant. Tirupathi Local was categorized as moderately resistant with 33.00 per cent flower damage. The other seven varieties viz. Arka Soumya, Arka Vijay, Arka Amogh, Arka Sambhram, West Godavari Local, Arka Jay and Konkan Bushan were rated as intermediate resistant to M. vitrata which recorded flower infestation percentage of 52.60 51.94, 50.21, 47.25, 42.64, 42.2 and 41.45 per cent, respectively with respect to the inflorescence damage due to spotted pod borer Maruca vitrata (Geyer).
Mass Multiplication of Chrysoperla carnea (Stephens) on Non Traditional Hosts
Annals of Plant Protection Sciences, 2005
Studies were carried out in search of an alternate host, which was ecofriendly and easy to mass-p... more Studies were carried out in search of an alternate host, which was ecofriendly and easy to mass-produce the predator. Tribolium castaneum larva and Drosophila melanogaster larva were identified as better alternate hosts for mass multiplication of the predator. Chrysoperla carnea larva reared on T. castaneum larvae underwent a high incubation period (5.25-6.13 days), high prepupal period (1.13-1.89 days) and pupal period (10.88-13.50 days) compared to those fed with Corcyra cephalonica eggs which remained in incubation for 3.79-4.83 days, with prepupal and pupal period of 0.29-0.84 and 7.66-9.13 days, respectively. Larval period (7.50-8.75 days) was however, significantly at par. Highest adult longevity (females- 46.00 to 54.54 days, male- 25.13 to 35.38 days) and fecundity (881.80 to 1061.00 eggs) was observed when larvae were fed with T. castaneum larvae. When C. cephalonica was used as a larval diet, adult longevity varied from 23.50-28.71 for males and 34.50-44.43 for females. Fe...
An investigation was carried out in the Department of Entomology, College of Horticulture, Dr. Y.... more An investigation was carried out in the Department of Entomology, College of Horticulture, Dr. Y.S.R. Horticultural University, V.R. Gudem to screen brinjal genotypes for tolerance/resistant to major pests. Out of 44 brinjal genotypes tested, IC-090050 and IC-090199 showed lowest infestation fruit and shoot borer while Irapaduguda-W showed highest. Based on percent fruit damage, twelve genotypes viz., IC090050, IC-090199, EC-169084, EC-316742, EC-316309, IC-089955, EC-316273, Bhagyamathi, IC090674, EC-169089, IC-110949 and IC-111392 were found to be moderately resistant to borer damage. The lowest percent fruit damage by Leucinodes orbonalis was observed in the genotype IC-090050 (10.26%) followed by IC-090199 (12.75%), EC-169084 (13.03%) and the lowest percent shoot damage was observed in the genotype IC-090050 (4.11%) followed by IC-090199 (4.21%) EC-169084 (4.32%) which were statistically on par with one another. Among 44 genotypes of brinjal tested, none of them were immune to j...
Tribolium castaneum Herbst and Drosophila melanogaster Meigen larvae were identified as better al... more Tribolium castaneum Herbst and Drosophila melanogaster Meigen larvae were identified as better alternate hosts for mass multiplication of the green lacewing predator, Chrysoperla zastrowi sillemi (=carnea) (EsbenPetersen) as against traditional host, Corcyra cephalonica (Stainton). Standardisation of host rearing techniques was carried out. A population density of 100 pairs of T. castaneum adult was observed to be an optimum population to produce more biomass in number (2265.00) and weight (244.30 mg) in short duration in 150 g of wheat flour. Similarly, 3 pairs of D. melanogaster was an optimum dose, producing maximum healthier larvae (209), which accounted for 1475.17 g biomass. A number of precautions to be undertaken for efficient insect handling are also included. It may be inferred from the studies that T. castaneum and D. melanogaster are easy to culture, with no health risk hence may be utilized in place of C. cephalonica in augmentative biological control programmes.
Feeding potential and cost of production of green lacewing, Chrysoperla carnea (Stephens) on alternate hosts
Annals of Plant Protection Sciences, 2005
Significantly high cocoon weight was observed when T. castaneum larva was provided as larval food... more Significantly high cocoon weight was observed when T. castaneum larva was provided as larval food (I generation-12.50±0.19, V generation-8.88±0.30 mg), while lowest on the eggs of Cadra cautella and C. cephalonica and values were statistically at par. Highest growth rate index was recorded in larvae fed with T. castaneum larvae (I generation-142.86, V generation-118.40) although pupae were also preyed by the predator. The cost of production of 1,000 eggs of the predator was worked out to be Rs.7.16, Rs.3.68 and Rs.7.06 on C. cephalonica eggs, T. castaneum larva and D. melanogaster larva, respectively. Lower production cost of eggs of C. carnea, when larvae were fed with T. castaneum larvae, was due to less amount of larval diet required, low mortality during developmental stages and emergence of highly fertile adults. These studies clearly indicate that T. castaneum was found to be suitable alternate host against the factitious laboratory host, C. cephalonica for commercial producti...
Bio physical mechanism of resisitance to major pests of brinjal
Pest Management in Horticultural Ecosystems, 2009
An Experiment was carried out with 44 brinjal genotypes at college farm, College of Horticulture,... more An Experiment was carried out with 44 brinjal genotypes at college farm, College of Horticulture, Dr.Y.S.R. Horticultural University, V.R.Gudem to see the effect of biophysical characters of plants on the infestation of major pests on different brinjal genotypes. It was observed that among the characters influencing Trichome density (-0.797 and -0.809), internodal length (-0.242 and -0.257), fruit length width ratio (-0.249 and -0.254) exhibited strong negative correlation with respect to Fruit and shoot damage. While shoot thickness (0.980 and 0.991) and diameter of fruit (0.426 and 0.445) showed significant positive correlation by fruit and shoot borer. Subsequently, Jassid intensity was showed significant positive correlation with shoot thickness (0.401), while negative correlation was observed with trichome density (-0.275) and fruit length width ratio (-0.232). Furthermore, whitefly and hadda beetle number showed negative correlation with shoot thickness (-0.474 and -0.517) and...
Five insecticides viz., acephate (0.480 kg a.i. ha−1); chlorpyriphos (0.400 kg a.i. ha−1) diazino... more Five insecticides viz., acephate (0.480 kg a.i. ha−1); chlorpyriphos (0.400 kg a.i. ha−1) diazinon (0.400 kg a. i. ha−1), endosulfan (0.400 kg a.i. ha−1) and phorate (2.500 kg a.i. ha−1) were evaluated for the control of white grubs. Plant damage recorded at 80 DAS in potato crop indicated that no significant difference was found between insecticidal treatments and control (7.33% of plant mortality). However, lowest plant damage (3.66%) was recorded in plots treated with phorate 10 G (2.5 kg a.i. ha−1). Per cent tuber damage at harvest was minimum in the phorate treated plot (37.50%) compared to untreated check (70.0%). On comparing yield data at harvest all the insecticidal treatments were significantly superior over untreated control (95.83 q ha−1). Maximum yield (158.33 q ha−1) was recorded with phorate 10 G (2.5 kg a.i. ha−1) followed by chlorpyriphos 1.5% dust (0.400 g a.i, ha−1) i.e. (150 q ha−1).
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