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Bioefficacy of some newer insecticides against major insect pests of tomato and their ecology

KrishiKosh

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Title Bioefficacy of some newer insecticides against major insect pests of tomato and their ecology
 
Creator Selvaraj, S.
 
Contributor Bisht, R.S.
 
Subject biological control, insecticides, insect pests, tomatoes, ecology, Helicoverpa armigera, Liriomyza trifolii, Bemisia tabaci, natural enemies
 
Description Thesis-PhD
The present investigation was carried out during 2011-12 and 2012-13 at Vegetable Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar situated in Tarai region of Uttarakhand. A total of ten species of insect pest belonging to four categories viz., Defoliators (3 species), sap suckers (5 species), miner (1 species) and borer (1 species)have been observed to attack tomato crop. The order Hemiptera occupied the largest number of species contributing about 34.21% of the total pest followed by Lepidoptera (28.95%), Diptera (14.47%), Coleoptera (7.89%), Orthoptera (6.58%), others (5.26%) and Thysanoptera (2.63%). Among the various insect pests of tomato, Helicoverpa armigera, Liriomyza trifolii, and Bemisia tabaci have been reported to be major insect pests.
The incidence of H. armigera on tomato during the cropping season 2011-12 and 2012-13 revealed that the pest marked its first appearance in 7th and 9th standard meteorological week (SMW), attain peak population in 16th and 15th SMW, respectively. Whereas, first appearance of leaf miner at 9thand 8th SMW, attain peak population in 14th and 17th SMW, respectively.
The life history of tomato fruit borer studied in laboratory revealed that female laid 180 to 260 eggs and 410 to 450 eggs during her life span on natural and synthetic diets, respectively. The incubation period, duration of different instars, pupal period and adult longevity have been observed to be 3-5 days, 20-25 days, 10-12 days and 5-6 days, respectively on natural diet whereas, 3-5 days, 25-28 days, 11-14 days and 7-9 days, respectively on semi synthetic diet.
During both the cropping season, the treatment chlorantraniliprole 4.3% + abamectin 1.7% SC at 30 g ai/ha has been found most effective insecticides against the population of H. armigera, L. trifolii and B. tabaci followed by chlorantraniliprole 4.3% + abamectin 1.7% SC at 60 g ai/ha. Minimum per cent fruit damage (5.25 and 4.71%) and maximum fruit yield (28.89 and 31.24 t/ha) was also recorded with chlorantraniliprole 4.3% + abamectin 1.7% SC at 30 g a.i/ha during both the cropping seasons 2011-12 and 2012-13, respectively. However, chlorantraniliprole 4.3% + abamectin 1.7% SC at 24 and 30 g ai/ha appeared to be the safest treatment for existing natural enemy population.
 
Date 2016-06-17T14:04:47Z
2016-06-17T14:04:47Z
2013-08
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67532
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)