مقارنة نوعين من المفترسات Clitostethus arcuatus (Rossi)‎ و (Coleoptera:Coccinellidae)‎ Serangium parcesetosum (Homoptera : Aleyrodidae)‎ Bemisia للذبابة البيضاء Sicard tabaci (Genn.)‎ في سورية

Abstract EN

The predation rate of larval stage and the daily predation ratio of the adult of the two predators were determined after being fed on eggs or fourth instar larvae of Bemisia (abaci throughout the growth period.

Ingestion of eggs and fourth instar larv ae by 5.

parcesetosum was higher 3 and 4 times than that of C.

arcuatus, respectively.

Fecundity of the two predators was studied and the results showed that the prey stage did not affect egg deposition by S.

parcesetosum, while C.

arcuatus did not lay eggs without feeding on prey eggs.

The total production by a female of S.

parcesetosum was 443.9 eggs (mean), at a daily rate of 18 eggs.

For C.

arcuatus.

egg-production was 110 eggs at a daily rate of 2.30 eggs.

Bean leaves were not suitable for laboratory rearing of larvae of both predators, while survival rate was the best for C.

arcuatus (73%) when reared on cabbage leaves, and the best for S.

parcesetosum (95%) was on okra leaves.

S.

parcesetosum excelled C.

arcuatus in all the characters studied and could be considered more promising in the biological control of whiteflies.