Abstract
A field and laboratory study was conducted to investigate the effects of Huwa-San TR50, abamectin and bifenthrin on the citrus rust mite, Phyllocopitruta oleivora (Ashmead) (Acari: Eriophyidae). A marked reduction in the population of P. oleivora was seen after one week of exposure to Huwa-San TR50, abamectin and bifenthrin. The mortalities of P. oleivora were 91.02 and 94.12% for 6000ppm of Huwa-San TR50 (without observable damages on the surface of fruits and leaves), 79.27 and 81.74% for the recommended rate of abamectin and 82.12 and 84.00% for bifenthrin under field and laboratory conditions, respectively. Moreover, the hatching percentage of eggs of P. oleivora were 41.08 and 39.88% for 6000ppm Huwa-San TR50; and 96.23 and 95.86% for abamectin and 93.57 and 94.54% for bifenthrin under field and laboratory conditions, respectively. Statistically, the difference between the two conditions (field and laboratory) was insignificant (P > 0.05 by using F-test in Graphpad Prism 7) on both mortality and larvae hatching from eggs percentages of P. oleivora.
On the other hand, the population of the predatory mite, Typhlodromips swirskii was reduced by 31.78 and 31.97% for 6000ppm of Huwa-San TR50; and by 88.82 and 91.36% for abamectin and by 97.10 and 100% for bifenthrin under field and laboratory conditions, respectively. Thus, Huwa-San TR50 seems to be less toxic to the predatory mite, T. swirskii. These findings can support the implementation of Huwa-San TR50 as a new and safe acaricide agent for controlling P. oleivora in the integrated pest management (IPM) program. (C) 2019 Friends Science Publishers