Field evaluation of recommended insecticides to control bollworms on cotton aphid. aphis gossypii glover and their side effect on associated predators

Abstract EN

Cotton aphid.

Aphis gossypii appears as serious late season pest of cotton causing severe losses in quality and quantity of lint.

Field experiments were conducted at Sakha Agriculture Research Station, Egypt icy of six recommended ; c ; in 2009 and 2010 seasons to evaluate the eff insecticides to control bollwor, i.

e.

lambda-cyhalothrin, alpha-cypermethrin, deltametlirin.

methomyl, profenofos and chlorpyrifos and two aphicides, i.

e.

thiamethoxam and imidacloprid at their recommended rates against A.

gos.

: ; ypii.

Side effect on associated predators was also studied, chlorpyrifos located that methomyl, profèncfbs Obtained results proved to be very effective against aphid causing percent reduction 5.57 to 94.

17 % in 2010 season.؟ from 83.

74 to 98.

06 % in 2009 *nd from The two aphicides ; thiamethoxam ana imidacl^prid caused 93.60 % and in 2009 season aj'id 94.24 % and 95 32 % in 2010 season؛95.00 % reduct I'he pyrethroid insecticides showed unpersuasive aphid coiufol.

Regarding؛the side effect otj associated predators, with except St evaJuated insecticides were ultimately toxic to the؛» imidacloprid, all the reduction in 2009 season and predators recording from 82.89 to 94.80 from 82.

76 to 92.

78 % reduction in 2010 season.

The two aphicides were the least toxic causing less than 50 % reduction in the two seasons of study.