Chlorpyrifos and cypermethrin for the control of litchi stink bug (Tessaratoma papillosa)

Zeng XinNian; Deng Dong; Wang JianMin

Acta Horticulturae 558: 421-423

2001


ISSN/ISBN: 0567-7572
Accession: 003678496

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Abstract
To identify alternatives to the long-used trichlorphon , the mixture of chlorpyrifos and cypermethrin (10:1) was tested against adults and nymphs of litchi (Litchi chinensis) stink bug. The mixture was highly effective against overwintered adults. Treatment with the mixture at a concentration as low as 138 ppm caused 100% mortality after 7 days compared to 1125 ppm trichlorphon. Although the mixture caused less mortality than trichlorphon on the first day, it gave 100% mortality of adults. They were severely affected, losing their ability to feed, fly and walk, and were left with trembling antennae, wings and legs. Results from residual tests indicated that the mixture at 550 ppm rate remained active for a longer time, although overwintered adults were easily killed by immediate contact with leaves treated with trichlorphon. Similar results were obtained with early instar nymphs. However, trichlorphon provided lower mortality of early instar nymphs than of overwintered adults; while the mixture of insecticide was slightly better. This might imply that there are differences in susceptibility to insecticides between nymphs and adults.