Field Evaluation of Selected Insecticide Sequences against Two Cotton Bollworms with Reference to Side Effects on Coccinella undecimpunctata L.

Abstract

Field studies were conducted during 2015 and 2016 cotton growing seasons, at AbouElmatameer, El-Behira Governorate to evaluate certain insecticide sequences in controlling two cotton bollworms pink bollworm (PBW), Pectinophora gossypiella, (Saund) and spiny bollworm (SPW), Earias insulana, (Boisd.) The side effects of all insecticide sequences on the lady beetle, Coccinella undecimpunctata was also determined. During 2015 season, sequence 2 (Dursban ® , Rado-X ® , Radiant ® , Cothrin ®) and sequence 6 (Dursban ® , Rado-X ® , Radiant ® , Proclaim ®) achieved the highest efficacy against PBW, gave general mean reduction percentages 81.4 and 83.5%, respectively. In season 2016, sequence 6 revealed the highest efficacy where the general mean reduction percentage was 83.3%. Sequences 6 induced the highest reduction percentages in cotton bolls infested by SBW in 2015 and 2016 seasons, with general mean reduction percentages 84.0 and 82.3%, respectively. Sequence 4 (Cothrin ® , Radiant ® , Rado-X ® , Dursban ®) achieved the least efficacy against PBW and SBW in both seasons 2015 and 2016. Sequence 6 proved to be the least toxic on C. undecimpunctata. On the other hand, all other sequences were comparable in there effects on C. undecimpunctata in both seasons.

Entomotoxic Properties of White Kidney Bean and Soybean Lectins and their Effects against Two Digestive Enzymes of the Spiny Bollworm, Earias insulana (Boisd.)

“…Larvae attack terminals of young cotton resulting in death of the growing buds and lead to development of lateral shoots and branches. With the progress of cotton growth, larvae of SBW feed on the squares and the bolls, destroying fiber and consuming seeds causing significant damage in cotton crop (Cayrol, 1972 andEl-Deeb et al, 2017). Cotton fiber production depends significantly on the efficient control of SBW in many areas.…”

Insecticidal Activity, Growth Inhibitory and Biochemical Effects of Plant Lectins and Bacillus thuringiensis var. kurstaki against the Pink Bollworm, Pectinophora gossypiella

“…The qualitatively and quantitatively cotton production depends mainly on the efficient control of PBW. The control of PBW relies mainly on chemical control (El-Feel et al, 1993;Khan et al, 2007;Magdy et al, 2009;El-Deeb et al, 2017) and recently Bacillus thuringiensis-transgenic cotton (Vaek et al, 1987;Mohan et al, 2016). However, chemical control is still adopted as the major tool for combating this serious insect pest.…”