Functional response of Chrysoperla carnea (Stephens) and Coccinella undecimpunctata (Linnaeas) on some pests attack cotton plant under laboratory conditions

Abd el-Salam A Farag; Hend A Gad; Hassan M Somaa; Elsayed A Refaei

Functional response of Chrysoperla carnea (Stephens) and Coccinella undecimpunctata (Linnaeas) on some pests attack cotton plant under laboratory conditions

Authors
Abd el-Salam A Farag, Hend A Gad, Hassan M Somaa, Elsayed A Refaei

Abstract
Understanding the interactions between predator and prey is the basis for bio-control strategy. In this study, the host preference of Chrysoperla carnea (Stephens) larvae and both larvae and adult females of Coccinella undecimpunctata (Linnaeus) between Aphis gossypii (nymph), Phenacoccus solenopsis (2^ndnymph), Spodoptera littoralis (newly hatched) and Tetranychus urticae (nymph) were evaluated. Results showed that A. gossypii was the most preferred host under optional feeding conditions of both predators comparing with other hosts. Although, the predation efficiency of both predators were conducted for Aphis gossypii and Phenacoccus solenopsis, as the average consumption ratio reach to 19.73% and 27.12% insects of aphid for larval stage of C. undecimpunctata and C. carnea respectively. Adult stage of C. undecimpunctata had more consumption than its larval stages reach to 27.47% insects of aphid. In forced feeding conditions the average of consumption ratio for larval stages of C. undecimpunctata was 31.10% and 28.59% for A. gossypii and P. solenopsis respectively. While larvae of C. carnea feeds on 30.77% and 27.46% of A. gossypii and P. solenopsis, respectively. Adult stage of C. undecimpunctata was consumed on 83% and 80.98% of A. gossypii and P. solenopsis, respectively. The present work indicated that C. undecimpunctata (larvae & adults) and C. carnea (larvae) are an effective bio-control agents of P. solenopsis as well as A. gossypii.

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