Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Biological studies of the spider mite, Tetranychus truncatus and its natural enemies.

Abstract

An account is given of studies in Taiwan during 1972-73 on the biology of Tetranychus truncatus Ehara, a common pest of upland vegetable crops including beans (Phaseolus). Descriptions of the life stages are given. Continuous rearing in the laboratory resulted in a total of 31 generations in one year. The egg, nymphal and adult stages averaged 6.22, 6.25 and 10.6 days, respectively. Each female laid an average of 60 eggs in about 9 days. The natural enemies found during a field survey included Oligota oviformis (Csy.), Arthrocnodax occidentalis Felt, Amblyseius longispinosus (Evans), Stethorus hirashimai Sasaji, S. chengi Sasaji, S. loi Sasaji, Eumicromus sauteri (Esb.-Pet.), Scolothrips sexmaculatus (Perg.) , Orius sp., Anystis sp., Bdella sp. Amblyseius largoensis (Muma) and A. ovalis (Evans); the first three species appeared to afford the greatest control.