EFFECT OF SUBLETHAL DEL TAMETHRIN DEPOSITS ON SOME BIOLOGICAL ASPECTS OF SPIDER MITE Tetranchus urticae AND THE PREDATORY MITE Amb/yseius fal/acis | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 1, Volume 27, Issue 4, April 2002, Page 2575-2586 PDF (3.57 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2002.253623 | ||||
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| Author | ||||
| I. I. EI-Fakharany | ||||
| Department of Pesticides, Faculty of Agriculture, Kafr EI-Sheikh Tanta University, Egypt | ||||
| Abstract | ||||
| Whole bean leaves were dipped in a range of deltamethrin concentrations to identify a concentration which causes no mortality, but which affected the feeding of the predatory mite, Amb/yseius fal/acis on the eggs of the two spotted spider mite, Tetranychus urticae. This concentration (0.0002%) was then used to assay the sublethal effects of deltamethrin on the oviposition of the two mites, prey consumption by the predator, and on the activity of T. urticae and A. fal/acis. The deltamethrin deposit reduced oviposition in both predator and the prey, this egg consumption by A. fal/acis was effectively reduced by presence of chemical on the leaf surfaces. Predators placed on leaves with no prey very quickly moved to infested leaves and remained there as long as adequate prey was available. During a seven days period, prey mites did not move from the leaf on which they were placed. The predator moved to treated leaves carrying prey, but preferred untreated leaves these were available. T. urticae activity showed that there was a significantly higher percentage of movement on treated discs and there was also a significantly longer average movement duration. On chemically treated surfaces, A. fal/acis showed decreased feeding and oviposition capacity compared with the control. A. fal/acis showed no significant increase in duration of movement on treated surfaces but the frequency of movement was increased about 50% and the proportion of time spent in moving was roughly doubled compared with control. | ||||
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