Population Fluctuation of Some Piercing-Sucking Pests and Their Associated Predator on Broad Bean Plants in Ismailia Governorate and Yield Loss for Aphid infestation

Abstract

Faba bean is an important position between leguminous food crops in Egypt. A piercing-sucking pest associated with broad bean plants causes serious damage, directly by sucking plant juices or indirectly as the aphid insects are vectors to plant diseases. A field experiment was conducted at Wadi Elmalak, Ismailia Governorate, Egypt in winter growing seasons 2018/2019 and 2019/2020. To evaluate the population fluctuation of some piercing-sucking pests and the common natural enemies and relation to weather factors on broad bean plants. Results indicated that the important piercing-sucking pests, pea aphid, Acyrthosiphon pisum (Harris) were the most dominant, followed by Aphis craccivora Koch, while green peach aphid, Myzus persicae (Sulzer), Thrips tabaci Lind. and Jassid, Empoasca discipiens Poali were found in low densities throughout the two seasons. The eleven spotted lady beetle, Coccinella undecimpunctata L., green lacewing, Chrysoperla carnea (Stephens), and seven-spotted lady beetle, Coccinella septempunctata L. are the most important predators which associated with the sucking insect pests on faba bean. The population fluctuation of piercing-sucking pests and associated predators were higher in the first season than in the second season. The pea aphid, A. pisum started with attacks broad bean in the second week of November and reached it has two peaks early January and in mid-May in the two successive years. The relationship between both of the population of piercing-sucking pests and associated predators and weather factors were studied. The loss in seed yield in the two successive seasons was evaluated all together being (330.0 kg. /fed). The avoidable losses in seeds yield were (19.18% per fed.) during two seasons