Impact of neighboring on some arthropods associated with castor bean, Recinus communis L. in Assiut Area

الملخص EN

To study the effect of different neighbors to castor bean, Ricinus communis L., on some arthropods inhabiting castor bean trees.

Two locations in Assiut Governorate involved two sites (agronomy farm and animal production farm) for each location was chosen during the whole year of 2012.

The pests [i.e.

whitefly, Bemis*, tabaci (Gennadius) (1-lomoptera) ; jassid, Empoasca spp.

(Homoptera) and the two-spotted spider mite, Tetranychus urticae Koch (Prostigmata)1 as well as the predators li.e.

Scolothrips longicornis Priesner (Thysanoptera); Onus spp.

(Heteroptera) and Amblysieus spp.

(Mesostgmata)] were surveyed on castor bean trees at two locations.

The population density, at animal production farm, was more abundant than that of agronomy farm for all species at both of cultivated land and newly reclaimed area except at agronomy farm in the newly reclaimed area B.

tabaci and Orius spp.

recorded higher abundant than that of animal production farm.

The difference of neighboring and location affects the fluctuation and peak of the studied species.

The results showed that B.

tabaci represented key pest at agronomy farm and animal production farm at both cultivated land and newly reclaimed area.

Whereas, T.

urticae and Empoasca spp.

showed as potential pest at both agronomy farm and animal production farm in both of locations.

Regarding the predators, S.

longicornis in the cultivated land and Amblysieus spp.

in the newly reclaimed showed higher dominant and abundant at both agronomy farm and animal production farm.