Ecological studies on cereal aphid Schizaphis graminum (Rondani)‎ on wheat plants and associated natural enemies in Fayoum governorate

Abstract EN

S.

graminum (Rondani) activity on wheat at Fayoum Governorate was evident from the 1st week of Feb.

to mid May with two peaks.

The first peak of infestation occurred at the early of April, with 90 and 49 aphids/10 plants during 2000/2001 and 2001/2002 seasons, respectively.

Also, five species of predators and three species of parasitoids were recorded in association with this aphid.

C.undecimpunctata and C.carnea were the dominant predators during the activity period from mid Mar.

to mid April.

On the other hand the parasitoids, Aphidius sp.

was the most common species, followed by Aphelinus sp.

and Diaeretiella rapae.

The major weather factors (max.

temp., min.

temp.

and RH.) showed insignificant effect on population of aphid , predators and parasitoids.