Kajian Biologi Ulat Penggerek Polong Maruca testulalis Gey ( Lepidoptera : Pyralidae ) Pada Tanaman Kacang Panjang Vigna sinensis

Abstract

Biological study of legume pod borer Maruca testulalis Gey ( LepidopterarPyralidae) on bean Vigna sinensis.The research string bean crop done with perception directly and also by using microscope to object perceived by like egg, larva, imago and pupa. The purpose of research is to know biological aspect of legume pod borer Maruca testulalis Gey on bean Vigna sinensis. Observed modifier is M. testulalis biology like the length of egg stadium, larvae, pupa and imago, life table and ratio of gender The result of research show that the size of egg is 0,56 ± 0,05 mm, wide is 0,26 ± 0,05 mm, periode of stady is 2,3 ± 0,89 days, number of taken egg is 74,2 ± 8,70 grain, and capacity of incubation is 83,0 ± 2,86 %. Larvae consist of 5 instar, each the length instar I, II, III, IV and V is : 0,65 ± 0,05 mm, 1,31 ± 0,16 mm, 4,82 ± 0,21 mm, 12,07 ± 0,67 mm and 16,31 ± 0,59 mm. Wide of larvae instar I, II, III, IV dan V is : 0,12 ± 0,04 mm, 0,24 ± 0,05 mm, 0,54 ± 0,05 mm, 2,38 ± 0,11 mm dan 2,91 ± 0,08 mm. Period of stadia instar I, II, III, IV dan V is : 1,8 ±0,4 day, 2,1 ± 0,3 day, 2,7 ± 0,46 days, 2,1 ± 0,29 days and 2,8 ± 0,31 days. The length of the pupa is 11,94 ± 1,30 mm and wide is 2,63 ± 0,11 mm. Period of stadia is 5,3 ± 0,46 days. Each length of male and female imago is 11,16 ± 0,81 mm and 11,74 ± 0,65 mm. wide of body is 16,67 ± 0,99 mm and 17,51 ± 0,94 mm. Period of stadia is 5,1 ± 0,54 days and 5,7 ± 0,46 days. Scale of male and female imago M. testulalis is 1 : 2,43. Life tabel shows that generation period of M. testulalis is 26 days, rate of netto reproduction is 4 generation and rate of intrinsic growth is 0,055.