Laboratory and field evaluation of environmentally safe chemicals against the two-spotted spider mite | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 11, Issue 1, June 2003, Pages 87-104 PDF (368.4 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2003.459431 | ||
| Authors | ||
| A. H. Hosny* ; A. Y. Keratum; M. M. F. El-Naggar; R. I. Magouz | ||
| Department of Pesticides, Faculty of Agriculture, Kaft El-Sheikh, Tanta University. Egypt | ||
| Abstract | ||
| Laboratory and field experiments were carried out to evaluate the toxic effect of five compounds; three hydrocarbon oils (KZ-oiI, chemesol and supermasrona), one pyrethroid (cypermethrin) and one biocide (Biofly) against adult female of the two spotted spider mite, Tetranychus urticae (Koch) and adult female of predatory mite, Amblyseius gossipi (El-Badry). The effect of sublethal doses of these compounds on some biological and behavioural characteristics of this mite and its predator was also examined. The evaluation of these compounds against T. urticae on soybean plants in the field was also studied. cypermethrin can not be recommended when safety and selectivity index are taken in consideration, but its toxic effect to prey mite and its low mammalian toxicity make us to keep it in mind under certain conditions. It was one of the most effective compounds on prey egg consumption by the predator A. gossipi. The mineral oils are of special purpose in mite control for their physical effect and relative high safety index on spider and predator mites. Supermasrona is a promising oil in integrated mite control programmes. Biofly did not exhibit certain trend for its ovicidal effect on different egg stages and its effect on prey egg deposition was decreased as time passing after treatment increased. Also, Biofly was one of the most safe compounds that allowed the predator to consume the contaminated prey eggs. In general, the time elapsed before introducing the contaminated prey eggs to adult predators is partially responsible for prey egg consumption and, consequently, the predator egg production. From the field trials, the mineral oils when used on soybean plants exhibited high mean reduction in motile and egg stages while cypermethrin was the least effective. | ||
| Keywords | ||
| Safe chemicals; Acaricidal; two-spotted spider mite | ||
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