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Yaku, Alexander 1992 Effects of Intercropping Sweet Potato on the Population Density of Sweet Potato Weevil, Cylas Formicarius (F.) (Coleoptera; Curculionidae), MSc Thesis, McGill University, Canada.
Judul: Pengaruh Tumpangsari Ubi Jalar terhadap Kepadatan Populasi Penggerek Ubi Jalar, Cylas Formicarius (f.) (Coleoptera; Curculionidae).

    © Alexander Yaku, 1992. Use of any part of this thesis for any purpose must be acknowledged.

Abstract

Field experiments were conducted during the 1989 dry season (July to December) at the Manggoapi Farm of the Faculty of Agriculture, Cenderawasih University in Manokwari, Irian Jaya, Indonesia. The objectives of the experiments were to determine the effects of four sweet potato cropping systems on the population density of sweet potato weevils (SPW) and on the diversity of other insects within these agroecosystems. Fewer SPW were found in intercropped sweet potato + corn (2 weevils per kg infected tubers), sweet potato + soybean (21 weevils), sweet potato + corn + soybean (8 weevils) than in monoculture sweet potato (37 weevils); percentage of damaged tubers followed the same trend, ranging from 2.6% to 14.0% in intercropped sweet potato, to 21.9% in the sweet potato monoculture. However, the higher number of SPW and damaged tubers in the monoculture did not reduce yield below that in the intercropped plots. Insect and spider populations were more diverse in the intercropped sweet potato systems than in monoculture. Number of arthropods increased throughout the growing season. Intercropping may reduce the population density of other insect pests associated with sweet potato and may increase the population density of natural enemies....


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