Side effect of certain pesticides on the non-target insects and cotton fibre quality | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 7, Issue 2, June 1999, Pages 71-90 PDF (4.44 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1999.462104 | ||
| Author | ||
| El-Sayed H. M. Tayeb* | ||
| Plant Protection Dept., Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria, Egypt. | ||
| Abstract | ||
| The cotton variety Giza 70 was cultivated during two successive seasons of 1997 and 1998. The experimental area was randomly divided into strip plots design. Each plot was treated with one of the following pesticides: Deltanet®, Match®, Evisect® and Sirene® during 1997 season. The application was done every two weeks. Side-effect of these insecticides in terms of increasing or decreasing the numbers of insects that spread out in the field was studied in relation to their side-effect on yield and fiber quality (in both seasons). Insects inspection was done for a period of 9 weeks. None of the tested compounds increased the numbers of the aphids (Aphis gossypii) more than that found on the untreated plants. Deltanet® showed the lowest mean number (15 aphids/5 leaves). Also, the effect of all used compounds on the numbers of the Jassid was not significant by the end of the inspection period. The numbers of the whitefly (Bemisia tabaci) were low except on those plants treated with Match® when the number was counted a week after the third spray (83 adults/5 leaves). That number was decreased to 7 adults/5 leaves a week later. Also, Match® increased the number of the cottonseed bugs Oxycarenus hyalinipennis (16.3 insect/plant), while the number of the bugs was 13-insect/untreated plant. Evisect® as well as Sirene® reduced the numbers of bugs on the treated plants. Moreover, there was no side effect of the applied compounds on either increasing or decreasing the numbers of the green bugs Nezara viridula. However, Sirene® as a selective compound against the pink-bollworm Pectinophora gossypiella, didn't reduce the number of the larvae, while Evisect® did During 1998 season, the same compounds that were used in 1997 season, were also used in addition to Aim-X® and Cascade®. None of the tested compounds showed any side effect on the predator lacewing (Chrysopa vulgaris). Aim-X$® and Cascade® increased the numbers of the aphid and the numbers of the pink-bollworm larvae. A higher yield was obtained from those plants treated with Deltanet®. Regarding the side-effect of the used compounds on fiber quality, it was found that they have no effect on staple length, elongation and lint strength during both seasons, except that, Cascade® increased lint fineness in 1998 season. | ||
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