EVALUATION OF ONION GENOTYPES AGAINST ONION THRIPS, Thrips tabaci LINDEMAN AND ITS MANAGEMENT THROUGH BOTANICALS

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Date
2016
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
Thereafter the population was gradually declined from 51st SMW, respectively. The majority of insect pests showed positive correlation with ambient temperature, relative humidity, wind velocity, sunshine hours and rainfall. Major insect pests in relation to predators viz., green lacewing, lady bird beetle and spiders were recorded during the crop growth period and showed highly significant correlation with thrips and jassid while non significant correlation with tobacco caterpillar and cricket population. In the study, 40 genotypes of onion including check variety Agrifound dark red as susceptible check were evaluated against incidence of thrips, Thrips tabaci L., Out of 40 genotypes, 8 genotypes were categorized as highly resistant, 10 as resistant, 17 as susceptible and 5 as highly susceptible to onion thrips. The genotype ON14-13 (3.03 thrips/plant) was considered as highly resistant followed by OSK-1306 (3.53 thrips/plant), ON14-01 (3.63 thrips/plant), and OSK-1301 (3.90 thrips/plant) because of lowest thrips population score and were superior with check variety Agrifound dark red. Genotype ON15-11 (17.64 thrips/plant) was highly susceptible than the check variety Agrifound dark red of onion. Maximum average weight loss per bulb (71.25%) was observed in the genotype ON15-11 followed by ON14-04 (55.97%) and ON14-23 (53.15%) with the minimum weight loss per bulb (2.70%) was recorded in the genotype OSK-1301 followed by OSK-1329 (5.40%). Maximum average loss in diameter per bulb (48.88%) was observed in the genotype ON15-11 followed by ON14-15 (33.52%) and ON14-23 (31.78%). The minimum loss in diameter (1.52%) was recorded in genotype OSK-1339 followed by ON15-04 (3.28%). Assessment of yield losses clearly pointed out that if pest is not managed properly, the losses caused due to the incidence of thrips from 1.5 to 43.31 % in yield depending upon the climate and area. Efficacy of botanicals against thrips on onion crop revealed that the spray of NSKE 5% followed by Neem oil 2% was the most effective against thrips as it recorded lowest thrips population (6.61thrips/plant) and (6.90 thrips/plant), respectively. However, Aak leaves extract was least effective as it recorded highest 15.09 thrips population per plant.
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109 p.
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