Rôle d’ Aphytis melinus (Hymenoptera, Aphelinidae) dans la régulation des niveaux d’infestation du Pou de Californie Aonidiella aurantii (Homoptera, Diaspididae) sur citronnier à Rouiba

Abstract

This study was conducted in a citrus orchard in the Rouiba area during the period from May 2014 to juillet 2015. The monitoring of the ecology of lice Aonidiella aurantii in California showed that the species evolves four annual generations. This cochineal has a very strong affinity for the center of the tree and the branch. As to also studied the role of Aphytis melinus in regulating the levels of infestation of lice in California. This parasitoid developing four generations each generation diaspine and attack more females stages, distribution of the parasitoid is closely correlated with the abundance of its host plant, have obtained a higher rate of parasitism on branches, while they were lower on the lowest leaves and on fruit. Regarding the seasonal phenology of California red Scale, it coincides with the pushed sap of lemon. This cochineal has a very strong affinity for the center of the tree and the branch and a fertility average of 6.2 eggs / female, it seems that this is more fertile on the fruit and the center of the tree. As to also studied the role of Aphytis melinus in regulating levels of infestations of lice in California.This parasitoid develop three generations each generation diaspine and attack more stages adult females than males who do not provide nutrients to the parasite, that A. melinus be considered a biparental ectoparasite, the distribution of the parasitoid is closely correlated with the abundance of its host plant, have obtained a higher rate of parasitism on twigs followed by fruits while they were lower on sheets. A.melinus ectoparasite is very sensitive to climatic conditions. During the hot saison, populations of parasitoids decreased considerably During winter the parasitoid remains in females shields without having development. By cons, in the fall with a warmer climate, parasitism tends to increase