Role of the Predaceous Insects in Regulating the Population of the Main Piercing-Sucking Insect Pests Attacking Certain Vegetable Crops

Document Type : Original Article

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Plant Protection Department, Faculty of Agriculture, Damietta University, Egypt

Abstract

Abstract: The experiments were conducted to study the role of predaceous insects in regulating the population of vegetable crops insect pests at Kafr-Saad area, Damietta Governorate, Egypt during summer plantation of 2022. Nine predators belonging to four insect orders; i.e. Copleoptrea, Heteroptera, Diptera and Nuroptera were recorded on cucumber, cowpea, tomato and sweet potato. The coccinellid predators (Coccinella undecimpunctata, C. septempunctata, Cryptolemus montiziri and Chilocorus nigritus) were more abundant species on the tested host plants than the other predator species; Orius spp., Macrolophus sp., Aphidoletes aphidimyza, Syrphus sp. and Chrysoperla carnea. The coccinellid predators represented by 26.8, 29.7, 29.9 and 26.7% of the total number of predaceous insects in cucumber, cowpea, tomato and sweet potato crops, respectively. While, Syrphus sp. recorded the smaller number and represented by 5.4, 9.2, 11.2 and 10.6% of the total numbers of predatory insects on the previous crops. In respect to the preference of predators for the host plants, all predators greatly prefer cucumber (4504 predators / 25 leaves) followed by cowpea (757 predators / 25 leaves) and tomato (411 predators / 25 leaves) while, sweet potato plants showed a less preference for all predatory insects and represented by (292 predators / 25 leaves).

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Al-Azhar Journal of Agricultural Research
Volume 49, Issue 2
December 2024
Pages 70-87

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