Efficacy of predatory mite, Amblyseius longispinosus (Evans) to the mulberry spider mite, Tetranychus truncatus (Ehara) on Rayong 72 cassava

Abstract

The efficacy test of predatory mite, Amblyseius longispinosus (Evans) to the mulberry spider mite, Tetranychus truncates(Ehara)at the rate of 1:10 individuals per plant using 3-month-old Rayong 72 cassava was conducted during January to April 2017 at National Biological Control Research Center. Northeastern Regional Center. The Completely Randomized Design (CRD) was layout with three treatments (tmt), four replications. Tmt 1: no release of both mulberry spider mite and predatory mite. tmt 2: release mulberry spider mite one individual per plant and tmt 3: release mulberry spider mite one individual per, after one week, predatory mite was then released at the rate of 1:10 individuals per plant. The result showed that in treatment 1 plant height was 29.00 cm. and 17 leaves were increased. The infestation of mulberry spider mite resulted in lower height of cassava, 14.00 cm in treatment 2 with 8.75 leaves. The population was peaked in the second week with an average of 543.5±39.38 individuals per plant, significantly different from treatment 3. In conclusion the predatory mite could control mulberry spider mite and brought down the population of mulberry spider mite from 104.25±35.43 individuals per plant in the first week to 14.50±14.18 Individuals per plant in the second week. Cassava plant in treatment 3 could recover from the infestation of mulberry spider mite with an increasing height of 23.50 cm.