IMPACT OF CHLORPYRIFOS APPLIED AT DIFFERENT GROWTH STAGES ON INSECT PESTS OF OKRA (Abelmoschus .....

Field tests were undertaken in Kumasi, Ghana during the 2013 main and minor planting seasons to assess the effect of Chlorpyrifos sprays at various growth stages of okra (Abelmoschus esculentus L.) on insect pest management. Chlorpyrifos at 1.5 ml/0.5 litre water was administered I exclusively during the vegetative growth stage of the crop (sprayed vegetative), (ii) only during the reproductive growth stage of the crop (beginning at 50% blooming of the crop - sprayed reproductive), and (iii) throughout the crop's growth period (sprayed throughout). There was also a control plot that just received water. P. uniformis Jacoby and P. sjostedti Jacoby were also collected, however the former accounted for nearly 99 percent of the total. During the main season, the sprayed throughout plots had much fewer Bemisia tabaci Gennadius and Podagrica spp. than the other treatment plots, whereas the insecticide-treated plots had significantly fewer Thrips tabaci Gennadius than the control plots. During the minor season, the sprayed throughout plots had much more Podagrica spp. than the other treatment plots, and the sprayed throughout and sprayed reproductive plots had significantly more B, tabaci aggregated on the leaves of the plants than the control plots. In the main season, the insecticide-treated plots had significantly less percent defoliation than the control plots, but the results were mixed in the minor season. Despite the fact that only the sprayed reproductive plots produced a substantial increase in okra yield, there were no significant variations in the number of damaged okra fruits.

Please see the link :- https://www.ikprress.org/index.php/JOGAE/article/view/270