In this experiment, liquid of soap at three dosages (3, 5 and 7 ml/L) and
Abamectin (12.5 ml/100L) has been used with releas of the mite predator,
Phytoseiulus persimilis for controlling the two-spotted spider mite, Tetranychus
urticae on bean pla
nts under laboratory conditions. Contact toxicity of soap
liquid and Abamectin were evaluated and classified according to IOBC.
Efficacy of soap liquid at 3 and 5 ml/L was not sufficient to repress spider mite
populations while the using of soap liquid at three concentration with
predatory mite showed supporter effect and provide satisfactory control
whereas soap liquid determined to be slightly harmful- moderately to P.
persimilis. Abamectin with predatory mite or if used only gave sufficient control
to spider mite population but without supporter effect between Abamectin and
predatory mite whereas Abamectin determined to be harmful to P. persimilis.
However, using soap at suitable dosage, with or without predatory mite, gave
encouraging results for controlling spider mites. Generally, using of soap
showed adaptation with predatory mite and proved supporter effect for
controlling the spider mites. In despite of, soap showed no phytotoxicity to host
plants but needs to be tested in greenhouse and field conditions before
application.