Một số đặc điểm hình thái, sinh học - sinh thái của sâu cuốn lá lạc đầu đen, Archips asiaticus (Walsingham)

Some morphological and bio-ecological characteristics of groundnut leafroller Archips asiaticus (Walsingham) (Lepidoptera: Tortricidae) NguyÔn §øc Kh¸nh1 , §Æng ThÞ Dung2
Summary
Groundnut leafroller Archips asiaticus (Walsingham) is a lepidopteran (Tortricidae family) and has a medium size. Eggs are laid in clusters about 23-101 eggs each. Eggs are spherical with pale yellow color at first, then become dark yellow. There are five instars in the development of larvae. The head, fore back thorax and forelegs are black, the body is dark green. The average size of the first instar is 1.8 ± 0.14 mm; the second instar 3.68 ± 0.10 mm; the third instar 8.93 ± 1.67 mm; the fourth instar 16.6 ± 0.15 mm and the fifth instar 20.43 ± 0.73 mm. Pupae is about 10.77 ± 0.51 mm and the adult length is 8.41 ± 0.40 mm with wingspan of about 19.31 ± 0.91 mm. The life cycle of A. asiaticus is about 31 - 38 days, average 33.5 ± 2.44 days at temperature of 25.8-28.50C and relative humidity of 62.2-82.3%. Food quality exerts an obvious effect longevity and reproductive capacity of A. asiaticus . Honey seemed to be the best food. The females lived longer and oviposition capacity was higher (lived 9.5 days and laid 286 eggs in compare with 7.8 days longevity and 149.3 eggs when feeds sugar solution 10%). Keywords: Groundnut, leafroller, Archips asiaticus