Effect of alternative preys on predation upon Aphis craccivora (Hemiptera : Aphididae)‎ by some aphidophagous predators larvae

الملخص EN

Effect of the presence of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) and Empoasca decipiens Paoli (Hemiptera: Cicadellidae) nymphs and both on the feeding potential of the predators Coccinella undecimpunctata L.

, Coccinella septempuncata L.

(Coleoptera : Coccinellidae) and Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) larval instars on Aphis craccivora Koch.

(Hemiptera: Aphididae) was determined in laboratory.

The presence of B.

tabaci nymphs reduced significantly the predation of A.

craccivora by 1st and 2nd larval instars of C.

undecimpunctata and 1st larval instars of C.

septempuncata and C.

carnea, meanwhile, the presence of E.

decipiens nymphs had not any effect.

On the other hand, the presence of B.

tabaci and E.

decipiens nymphs affected significantly on the predation of A.

craccivora by the 3rd and 4th larval instars of C.

undecimpunctata; 2nd, 3rd and 4th larval instars of C.

septempuncata and 2nd and 3rd larval instars of C.

carnea.