SEASONAL FLUCTUATIONS AND GENERATIONS NUMBRER OF TORTOISE BEETLE, CASSIDA VITTATA (Vill.)  INFESTING SUGAR BEET PLANTS AND THE  SOME ASSOCIATED PREDATORS, EGYPT

Habshy, Aml Z. N. Al –; Elsamed, A. A. Abd –; Amer, S. A. M.

doi:10.21608/mjapam.2020.169576

SEASONAL FLUCTUATIONS AND GENERATIONS NUMBRER OF TORTOISE BEETLE, CASSIDA VITTATA (Vill.) INFESTING SUGAR BEET PLANTS AND THE SOME ASSOCIATED PREDATORS, EGYPT

Document Type : Original Article

Authors

Plant Prot. Res. Inst., Agric. Res. Cent., Dokii, Giza, Egypt

10.21608/mjapam.2020.169576

Abstract

Seasonal fluctuations and number of generations of Cassida vittata (Vill)(eggs, larvae and adults) and seasonal fluctuation of the some associated predators, Coccinella undecimpunctata (L.), Paederus alfierii (Koch.), Chrysoperla Carnea (Stephens), Scymnus sp.andtrue spiders were studied at Diarb- Nigm district, Sharkia Governorate, during the two sugar beet plants seasons 2015/2016 and 2016/2017. The seasonal fluctuation of C. vittata (adults, eggs and larvae) on sugar beet plants recorded two peaks during each seasons. Peaks of eggs were recorded in 7^th of March and 4^th of April in the first season, while in the second season, these peaks were noticed in 6^th of March and 17^th of April. Peaks of larvae were recorded in 21^th of March and 2^nd of May in the first season, while in the second season, these peaks were noticed in 20^th of March and 1^st of May. Peaks of adults were recorded in 11^th of April and 2^nd of May in the first season, while in the second season, these peaks were noticed in 3^rd of April and 1^st of May. C. vittata eggs, larvae and adults were recorded were recorded three generations for the two seasons. The peak of C. undecimpunctat and P. alfierii was occurred in 21^th of March and 20^th of March for the first and second seasons. The peak of C. Carnea was recorded in 14^th of March and 13^th of March for the two seasons. The peak of true spiders was recorded in 11^th of April and 17^th of April for the two seasons. The numbers of Scymnus sp was decreased for the two seasons. The relation ship between (adults, eggs and larvae) numbers and mean maximum, minimum temperature and RH%.

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