TAILIEUCHUNG - Effect of temperature on the life cycle and predatory capacity of ladybird beetle micraspis discolor fabricius

The study of the biology of M. discolor would help to use this insect of proper biological control. So, the present study was undertaken to observe the biology and the effect of temperature to the life cycle and predatory capacity of M. discolor. | TẠP CHÍ SINH HỌC, 2013, 35(1): 37-42 EFFECT OF TEMPERATURE ON THE LIFE CYCLE AND PREDATORY CAPACITY OF LADYBIRD BEETLE MICRASPIS DISCOLOR FABRICIUS (COLEOPTERA: COCCINELLIDAE) Bui Minh Hong*, Tran Thi Thanh Binh, Vu Thi Thu Hang Hanoi National University of Education, *bui_minhhong@ ABSTRACT: The effects of temperature on the development and the predatory capacity of Micraspis discolor larvae were studied in laboratory. Two temperature levels °C and on average, were used to assess the life cycle and developmental stages of the ladybird beetle M. discolor. The life cycle of M. discolor was days at °C and reduced to days at °C, the total larval period was and days, respectively. The pre-oviposition period of the ladybird beetle M. discolor was days at °C and days at °C. The female beetles laid 282 eggs and the hatching percentage of egg was at °C and 179 eggs and the hatching percentage of egg was at °C. At temperature °C and °C, the pupal periods were and days, respectively. The longevity of adult ladybird beetles was slightly prolonged when they were reared at °C compared with that when they were reared at °C. Feeding on the second insturs of B. brassicae the predatory capacity of M. discolor larvae consumed an average prey per day at °C and prey per day at °C. Keywords: Micraspis discolor, life cycle, longevity, predatory beetle. INTRODUCTION The ladybird beetle have been known worldwide as a predator of a number of insects. They are distributed in many countries of Asia [6]. This beetle, often called ladybug or coccinellid, is the most commonly known of all beneficial insects. In Europe these beetles are called ladybirds [16]. They are of great economic important as predaceous both in their larval and adult stages on various important crop pests such as aphids, coccids and other soft bodied insects .

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