劳氏黏虫在4种寄主植物上的生长发育和繁殖

摘要

[Objective]To study the influences of four different host plants on the growth, development and reproduction of Leucania loreyi(Duponchel)(Lepidoptera:Noctuidae).[Method]Under laboratory conditions of(24±1)℃,(75±5)% relative humidity and 12 h light:12 h dark photo period,the larvae of L.loreyi were fed on maize(Zea mays),rice(Oryza sativa),sugarcane(Saccharum officinarum)and barnyard grass(Echinochloa crusgalli)repectively.The development duration,survival rate,pupal weight and fecundity of L.loreyi were observed, and the life table parameters were calculated.[Result]The larva growth duration was the shortest when feeding on maize (20.18 d), and the longest when feeding on sugarcane (25.24 d). The survival rate from egg to pupa was the highest when feeding on maize (68%) and the lowest when feeding on barnyard grass (58%). The female pupa was the heaviest when feeding on maize (32.43 mg) and the lightest when feeding on barnyard grass (22.61 mg). The fecundity per female was the highest when feeding on maize (1 019.42 eggs) and the lowest when feeding on sugarcane(665.27 eggs).The intrinsic rate of increase(rm)of L.loreyi was 0.13, 0.12, 0.10 and 0.10 when feeding on maize, rice, sugarcane and barnyard grass respectively, and the net reproduction rate (R0) was 226.54, 211.48, 153.71 and 171.85 respectively.[Conclusion]Among the four host plants,maize is the optimal host plant for L.loreyi,followed by rice.Sugarcane and barnyard grass may serve as hosts or intermediate hosts.%[目的]明确寄主植物对劳氏黏虫Leucania loreyi (Duponchel)生长发育和繁殖的影响.[方法]在温度(24±l) ℃、湿度(75±5)%、光周期为12 h光:12 h暗的室内条件下,分别以玉米、水稻、甘蔗和稗草叶片为寄主植物,观察劳氏黏虫各虫态发育历期、存活率、蛹质量、成虫繁殖力并计算生命表参数.[结果]劳氏黏虫幼虫历期取食玉米时间最短,为20.18 d,取食甘蔗时间最长,为25.24 d.非成虫期存活率在玉米上最高(68%),在稗草上最低(58%);雌成虫蛹质量以取食玉米的最高(32.43 mg),取食稗草的最低(22.61 mg);取食玉米的产卵量最多,单雌产卵量为1019.42粒,取食甘蔗的产卵量最少,单雌产卵量为665.27粒.劳氏黏虫在玉米、水稻、甘蔗和稗草上的内禀增长率(rm)分别为0.13、0.12、0.10和0.10,净增殖率(R0)分别为226.54、211.48、153.71和171.85.[结论]在4种寄主植物中,玉米为劳氏黏虫最优寄主,其次是水稻,甘蔗和稗草可作为寄主或中间寄主.