Field evaluation of insecticides sequences against cotton leafworm, four sucking pests, six insect predators in cotton fields and cotton yield in Egypt

Hassan M Somaa; Abdelsalam A Farag; Elsayed A Refaei

Field evaluation of insecticides sequences against cotton leafworm, four sucking pests, six insect predators in cotton fields and cotton yield in Egypt

Authors
Hassan M Somaa, Abdelsalam A Farag, Elsayed A Refaei

Abstract
Studied the field evaluation of seven insecticides sequences against cotton leaf worm, four sucking pests, six insect predators in cotton fields and cotton yield, during the two successive cotton seasons (2019 and 2020) in Sakha Agricultural Station Farm, Kafr El-Sheikh region Egypt. The obtained results showed that: the best insecticides sequence against the cotton Leaf worm, Spodoptera littoralis (Boisd.), was (organic phosphors) (sylian), emamectin benzoate (contact) and insect growth inhibitor (IGI) (killeforon), followed by sequence (killeforon, sylian and contact) with means reductions in numbers of the egg – masses (87.90, 86.73%) in the two seasons, respectively. While, the cotton aphid, Aphis gossypii Glover and the jassids, Empoasca spp., sequence (killeforon, sylian and contact) was the best effective and the second sequence (contact, contact and contact) with means (83.62 and 72.37%) and (75.77 and 67.56%) of reduction in aphid and Jassids populations, respectively. The whitefly, Bemisia tabaci (Genn.), the sequence (sylian, sylian and sylian) was the first effective with mean (81.14%) of reduction in population of this pest, but this sequence was the second effective of reduction in population of green stink bug, Nezara viridula (L.) with mean (78.12%). The sequence of (killeforon, killeforon and killeforon) was the second effective of reduction in whitefly population with mean (72.65%), and the first effective of reduction in green stink bug population with mean (78.97%). All insecticides sequences shown high reduction of the all insect predators populations (Paederus alferii Koch, Coccinella undecimpuncata L., Scymnus spp., Chrysoperla carnea schn., Syrphus spp. And Orius spp.), but, the sequence of (sylian, sylian and sylian) was the first effective in reduction of the all insect predators populations with range between (69.22 – 80.94%). The biocides sequence (Diple, Diple and Diple) was the least effective than of the other insecticide sequences throughout the treatments with range between (9.79 – 37.59%) and (19.20 – 46.77%) in reduction of the pests and predators populations, respectively. Results appeared that, the highly effective insecticidal sequence against cotton leafworm had the highly cotton yield production.

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