Complete development can range from five weeks during the summer, to five monthsduring the winter. In Israel, five to six generations occur per year on citrus. If the hostcycle also includes grapes, then six to seven generations may occur per year (Avidovand Harpaz, 1969). Carter (1984) states that this species has three to four generationsa year in southern Europe and up to five in North Africa. The number of generations peryear is highly dependent on the climate and host plants utilized. The generations canmove between different host plants depending on what is available at the time
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