Vol. 10, Issue 2 (2021)

Author(s):
Rashmi Bajpai and Bharat Lal

Abstract:
Diseases and Pests are very important constraints for production of chilli. Whitefly, Aphids, Thrips and Red mites (Sucking Pests) are the major insect/pest to do the major crop loss. A foliar application of Agro Chemicals is very effective control measures of disease and pests. The objective of present research work is to control the various sucking pests like whitefly and thrips by foliar application of Quinalphos 20% EC and Deltamethrin 1% EC. The experiment was laid out in a Randomized Block Design with three replications. After two foliar spray (at 5 days, 10 days & 15 days respectively) the lowest whitefly population (0.54 whitefly/3 leaves) was recorded in the treatment T₉ (Quinalphos 20% EC + Deltamethrin 1% EC @ 3200 ml/ha) over control (5.65 whitefly/3 leaves), while, it was at par with the treatment T₃ (Quinalphos 20% EC + Deltamethrin 1% EC @ 800 ml/ha) i.e. 0.61 whitefly/3 leaves) and T₈ (Quinalphos 20% EC + Deltamethrin 1% EC @ 1600 ml/ha ) i.e. 0.60 whitefly/3 leaves. Similarly lowest thrips population was recorded in the treatment T₉ (Quinalphos 20% EC + Deltamethrin 1% EC@ 3200 ml/ha) i.e. 1.20 of thrips/plant over the control i.e. 8.44 thrips/plant, while it was at par with the treatment T₃ (Quinalphos 20% EC + Deltamethrin 1% EC @ 800 ml/ha) i.e.1.28 thrips/plant and T8 Quinalphos (20% EC + Deltamethrin 1% EC @ 1600 ml/ha) i.e. 1.27 thrips/plant. Application of Quinalphos 20% EC & Deltamethrin 1% EC at various doses @ 600-3200 ml/ha did not cause any phytotoxic effect on chilli crop. Highest yield was recorded in T₉ (Quinalphos 20% EC + Deltamethrin 1% EC@ 3200 ml/ha) i.e. 15.27 t/ha. The study indicated that Quinalphos 20% EC & Deltamethrin 1% EC @ 800 ml/ha is economically effective against whitefly and thrips in a chilli. The study showed no buildup of resistance in targeted sucking pests like whitefly and thrips against this chemical.