Abstract
Studies were carried out in the Arab Republic of Egypt to study certain aphid species infestation, their associated parasitoids on Cabbage, Cauliflower, faba bean, oleander plant (Dafla), cucumber, corn and cowpea plants. Survey and seasonal abundance of the aphid species Brevicoryne brassicae L., Aphis craccivora (Koch), Aphis nerii Fonsecolombe., Hyalopterus pruni (Geoffroy), Aphis gossypii Glover, Rhopalosiphum maidis Fitch Rhopalosiphum padi L. and Hypermoyzus lactucae L. and its parasitoids were studied. Obtained results of the study showed that Diaeretiella rapae (M’Intosh) was the dominant parasitoid on aphid species. Longevity was affected by temperature and food but the sex ratio was not affect by host species. The behavior of this parasitoid at varying host densities was also studied. Result showed a decrease of host-searching and first sting times with increasing host density but number of sting and number of mummies increased as host density increases. The obtained results evaluated the role of the parasitoid D. rapae in controlling B. brassicae and A. craccivora under greenhouses and field conditions. Results emphasized that the efficiency of this aphid parasitoid had been decreased with the highly population density of aphids. It may be concluded that when this aphid parasitoid used as biological control agents against B. brassicae and A. craccivora should be used with low host density.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call