Effect of Imidacloprid and Thiamethoxam Seed Treatment on Storability and Sucking Pests in Sunflower
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Date
2011
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UAS, Dharwad
Abstract
Both laboratory and field experiments were carried out at the Agriculture
College, Dharwad during 2009-10 to study the effect of imidacloprid and
thiamethoxam seed treatments on storability and incidence of early sucking pests in
sunflower hybrid KBSH-41. Laboratory studies indicated that seeds treated with
imidacloprid and thiamethoxam seeds could be stored in polythene bag of more than
700 gauges up to ten months without significant reduction in the seed quality.
Field studies revealed that the reduction in thrips population was highest in
treated check (imidacloprid 200 SL @ 0.25 ml/l) as compared to other treatments. The
treated seeds could be stored for one month without loosing any efficacy against
thrips. Lowest leaf hopper and whitefly incidence was recorded in seeds treated with
imidacloprid 600 FS @ 10 ml/kg seeds followed by imidacloprid 70 WS @ 5 g/kg
seeds, thiamethoxam 70 WS @ 5 g/kg seeds and thiamethoxam 35 FS @ 10 ml/kg
seeds. Both leaf hopper and whitefly were under control up to 45 days and treated
seeds could be stored for two and three months, respectively without loosing any
efficacy. The honey bee visitation to sunflower field and head diameter were
unaffected by seed treatment with insecticides and different storage periods.
Significantly highest gross and net returns were obtained in imidacloprid 600
FS @ 10 ml/kg seeds followed by thiamethoxam 70 WS @ 5 g/kg of seeds and the
latter treatment was on par with thiamethoxam 35 FS @ 10 ml/kg of seeds and
imidacloprid 70 WS @ 5 g /kg seeds. Seeds stored for one month recorded
significantly higher gross returns and net profit as compared to any of the other
storage periods. Higher cost benefit ratio (2.63) was recorded from imidacloprid 600
FS @ 10 ml/kg seeds treatment followed by imidacloprid 70 WS @ 5 g/kg
seeds.
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Keywords
Agricultural Entomology