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plants" with planthoppcr eggs were exposed in the fields, and field sampling ef cggs. Mortality in cgg stagc varied from 23% to 92% tn IVL lugens, and f'rom 1 l e/. to 90% in S.jurcijZra. Parasitism by wasps was the ma.ior mortality factor in the egg stage. The parasitoids rinagrus and Oligosita emerged from both planthoppcr eggs. In IVL lugens eggs, Anagrus spp. were preclominant whcn the rice plants were young, The parasitism by Oligosita spp. increased with growth of the rice plants. In S, .furc(fara eggs, Anagrus spp. were predominant throughout the crop season. The maximum parasitism ratcs were 68V6 in N. Iugens eggs and 69% in S. .fiircijlera eggs, Significant differences bctween the two methods were detected in only two cases. Parasitism indicated by the trap method refiected the aetual state ofparasitism in the field fairly well,

applied entomology and zoology

Parasitic Activities of Egg Parasitoids on the Rice Planthoppers, Nilaparvata lugens(STAL)and Sogatella furcifera(HORVATH)(Homoptera:Delphacidae), in the Muda Area, Peninsular Malaysia