Field and laboratory evaluation of certain insecticide against apple wooly aphid Eriosoma Lanigerum (Hausmann) | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 3, Issue 1, June 1991, Pages 130-142 PDF (536.63 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1991.461569 | ||
| Authors | ||
| Ahmed A. Zaytoon* 1; Mohamed S. Shawir2; Tawfik A. Hassan3 | ||
| 1Division of Entomology Faculty of Agriculture, University of Alexandria, Alexandria. Egypt | ||
| 2Division of Pesticide Chemistry, Faculty of Agriculture, University of Alexandria, Alexandria. Egypt | ||
| 3Faculty of Agriculture, University of Sanna, Yemen, | ||
| Abstract | ||
| The compatibility of mineral oil mixed with pirimiphose- methyl (50% E.C) or chlorpyrifos (48% E.C.) was tested before and after mixing in both laboratory and the field. No creaming separation was observed in the field and the mixtures thus passed the emulsion stability standard test. Mixing of chlorpyrifos with the mineral oil improved the physio chemical properties of the mixture because it increased the rate of spontaneous emulsification. Mineral oil, pirimiphose- methyl, chlorpyrifos, cypermethrin (20% E.C.) and methomyl (90% SP) AS WELL AS pirimiphose- methyl or chlorpyrifos with mineral oil were tested in the laboratory for their toxicity against Eriosoma Lanigerum the apple wooly aphid, by using two application methods. Chlorpyrifos/ oil/ pirimiphose- methyl was the most toxic followed in a descending order by pirimiphose- methyl/oil mixture, chlorpyrifos and pirimiphose- methyl. Methomyl and cypermethrin were the least toxic insecticides; based on concentration/mortality regressions. Under the field-testing concentrations, the highest reduction in field population was gained after treatment with Chlorpyrifos /oil mixture while the single treatment gave less reduction. | ||
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