Title: Control Efficacy and Application Technique of Five Insecticides against Aphid and Diamondback Moth in Cabbage Field
Abstract: The efficacy of five new insecticides was determined against aphid and diamondback moth in cabbage field.Results indicated that pymetrozine 60% and 70% WG provided excellent control of aphid.Efficacy ranged between 96.0%~99.6% from 3 to 10 days after spraying treatment,and it lasted for more than 10 days,which were significantly better than that by applying lambda-cyhalothrin 2.5% EW at 6.56 g/hm2 and similar to that by using acetamiprid 3% EC at 15 g/hm2 or imidacloprid 10 % WP at 15 g/hm2.It was suggested that the application rate against aphid was 81~117 g/hm2 for pymetrozine 60% WG and 84~126 g/hm2 for pymetrozine 70% WG.Spraying should be made when aphid numbers were at the beginning to rise.Results also showed that chlorantraniliprole,indoxacarb and flubendiamide revealed to be effective on diamondback moth.Reduction percentage of the larvae was more than 85% and 90% at 2 and 5 days after spray treatment,respectively,and remained about 90% at 7 days after the spray,which was equivalent to that by using abamectin 1.8% EC at 10.8 g/hm2.It was recommended that the application rate against diamondback moth was 30~37.5 g/hm2 for chlorantraniliprole 200 g/L SC,33.75~40.5 g/hm2 for indoxacarb 150 g/L EC and 30~45 g/hm2 for flubendiamide 20% WG.Spraying should be applied just when most of the population is in the small nymph stage of development.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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