Bài báo này trình bày một số kết quả nghiên cứu đặc điểm sinh học, sinh thái của bọ rùa hai mảng đỏ làm cơ sở để sử dụng chúng phòng trừ loài rệp muội và các loài sâu hại khác. | VNU Journal of Science Natural Sciences and Technology Vol. 36 No. 4 2020 19-24 Original Article Biological and Ecological Characteristics of the Ladybird Beetle Lemnia biplagiata Swartz 1808 Coccinellidae Coleoptera Bui Minh Hong1 Tran Dinh Chien2 1 Hanoi National University of Education 136 Xuan Thuy Cau Giay Hanoi Vietnam 2 Hanoi National University of Agriculture Trau Quy Gia Lam Hanoi Vietnam Received 05 February 2020 Revised 24 March 2020 Accepted 13 April 2020 Abstract This paper studies the ladybird beetle in the laboratory at two average temperature levels and with average humidities of and respectively using Rhopalosiphum maidis as prey to observe its biological characteristics. The study results show that the ladybird beetle completes its life cycle in a time range from days at and 0 06 RH to days at C and RH. The survival rate of ladybird larvae and the percentage of larvae aged 4 into pupae at C and RH were higher than those at and RH by and respectively. Using Rhopalosiphum maidis as food the ladybird beetle larvae s food consumption increases from age 1 to age 4 and the adults consume more food than the fourth-stage larvae by day at C and RH. At and RH the ladybird beetle larvae s R. maidis food consumption at all phases was about times higher than at C and RH. Keywords Ladybird beetle Lemnia biplagiata life cycle survival rate ratio into pupae predatory beetle ____ Corresponding author. Email address bui_minhhong@ https 2588-1140 19 20 . Hong . Chien VNU Journal of Science Natural Sciences and Technology Vol. 36 No. 4 2020 19-24 Một số đặc điểm sinh học sinh thái của bọ rùa hai mảng đỏ Lemnia biplagiata Swartz 1808 Coccinellidae Coleoptera Bùi Minh Hồng1 Trần Đình Chiến2
