Biology and population abundance of spider mite tetranychus kanzawai (Acari: Tertanychidae) on Two cultivars of Jatropha curcas

Abstract

Spider mite Tetranychus kanzawai is one of the most important pests attacking leaf of Jatropha curcas. Study was conducted with the objectives to elucidate life history parameters and abundance of spider mite on two Jatropha curcas cultivars. Field studies were carried out in BALITTRI Pakuwon Sukabumi, and laboratory experiments were conducted at the Department of Plant Protection, Bogor Agricultural University, from June to November 2008. Cultivars significantly affected some life history parameters of the spider mite. Spider mite reared on IP1 cultivar have longer oviposition period and higher fecundity than those on IP2 (7.00 days and 25.56 eggs against 5.00 days and 10.00 eggs). Intrinsic rate of increase was also higher on IP1. However, field studies indicated that the spider mite were less abundant on this cultivar. These might be due to the presence of other arthropods which were higher on IP1. In general, the highest population of spider mite occurred in August and the lowest in October- November.