| Abstrakt: |
Field experiments were carried out to study the effect of four insect growth regulators belonging to two major groups: chitin synthesis inhibitors (CSIs); lufenuron and teflubenzuron and non-steroidal ecdysteroid agonists (NEAs); methoxyfenozide and chromafenozide compared to two traditional insecticides; chlorfenapyr and profenofos against and the cotton leafworm, Spodoptera littoralis (Boisd.) and sucking pests: Bemisia tabaci (Genn.), Empoasca spp. and Tetranychus urticae Koch. Furthermore, their impact on common predators which exists in Egyptian cotton fields during 2017 and 2018 seasons. Results revealed that lufenuron proved to be highly effective against all tested pests with special regard to S. littoralis that showed highly significant initial and residual reduction compared to other pesticides (98.18±0.69 and 97.75±0.87%) and (98.83±0.56 and 98.25±0.54) in 2017 and 2018, respectively. Generally, all the tested IGRs showed moderate to low reduction percentages for B. tabaci, Emposca spp. and T. urticae in both initial and residual effects, respectively. On the other hand, profenofos was found most toxic and significantly reduced the predator's population recorded 62.83±0.81 & 38.15±0.73% in 2017 and 60.56±1.03 & 34.88±0.53% in 2018 in the initial and residual reduction, respectively, followed descendingly by chlorfenapyr and finally the tested IGRs. Both Orius spp. and spiders were more susceptible than other predators towards all pesticides used. [ABSTRACT FROM AUTHOR] |
