【摘要】 通过测定蓼龟象甲 (Rhinoncuspericarpicus.L .)幼虫头壳宽度 ,确定该虫幼期有三龄 ,即 1龄头壳宽度为 ( 0 .30 5± 0 .0 10 5)mm ;2龄为 ( 0 .516± 0 .0 10 5)mm ;3龄为 ( 0 .796± 0 .0 0 83)mm。其龄期与幼虫头壳宽度的关系式为 y =- 0 .0 372 +3.782 3x。更多还原

【Abstract】 Rhinoncus pericarpicus L. is an important insect pest in forage crops of Rumex K 1. Through measure the wide of head capsule of larvae, 3 instars in the larvae is indicated. The average wide of the 1st, 2nd, 3rd, instar larvae is 0.305 mm±0.0105 mm, 0.516 mm±0.0105mm , 0.796 mm±0.0083 mm respectively. After analysing the date, we obtainan linear formula of instar larvae (y) and wide of head capsule of larvae (x):y =-0.0372 + 3.7823x更多还原