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莲草直胸跳甲(Agasicles hygrophila)为引进我国控制入侵种喜旱莲子草(Alternanthera philoxeroid es)的专食性天敌.它在主要植物上是否安全直接影响到其生防价值和生态安全.对前人已研究过的且对莲草直胸跳甲有影响的非靶标植物进一步研究,从莲草直胸跳甲的趋性、取食及非靶标植物对幼虫的寿命长短、生长发育的影响等指标筛选出黄瓜(Cucumis sativus)、豇豆(Vigna unguiculata)等植物,并采用涂抹汁液饲喂法、全汁液饲喂法和植物表皮毛数量与类型测定、植物表皮毛处理等方法来研究目标植物对莲草直胸跳甲幼虫的致死原因.结果显示:莲草直胸跳甲对豇豆、黄瓜叶片有趋性和轻微取食现象,且其幼虫在豇豆叶片上聚集性死亡,因此其幼虫对黄瓜、豇豆是安全的.莲草直胸跳甲幼虫取食豇豆、黄瓜叶片汁液48 h内存活率为100%,豇豆叶片表皮毛为钩状,且其背面表皮毛的数量最多,为139±14.11,其中幼虫在豇豆叶片背面死亡率最高,为53.33%±0.09%.2龄幼虫在豇豆叶片背面的脱离率最小,为6.67%±0.03%,去除豇豆叶片表皮毛以后,幼虫在豇豆叶片上的脱离率为100%.综上,豇豆、黄瓜叶片汁液对莲草直胸跳甲幼虫生存影响不显著,钩状表皮毛对莲草直胸跳甲幼虫有致死作用,表明非靶标植物的物理性状在引进天敌昆虫适应性上为不利因素.
Agasicles hygrophila is an autopteran natural enemies to introduce Alternanthera philoxeroides estrogen, an invasive alien species in China, and its safety on major plants directly affects its biocontrol value and ecological security. The non-target plants which have been studied and have an impact on the straight thoracic vertebrae are further studied. From the tendency of the straight thoracic vertebrae, the effects of feeding and non-target plants on the larval life span, growth and development, etc. Cucumber (Cucumis sativus), Vigna unguiculata (Cucumis sativus) and other plants were screened out, and the target plants were studied by using the methods of sucking juice feeding, whole juice feeding, the number and type of plant epidermis and the treatment of plant epidermis. The results showed that the straight thorax Atractylodis gracilis had the tendency and slight feeding on the leaves of the cowpea and cucumber, and the larvae gathered on the cowpea leaf to death, , Cowpea is safe.Lactam larvae feeding on cowpea, cucumber leaf juice 48 h survival rate of 100%, cowpea leaf epidermal hair hook, and the back of the surface of the highest number of epidermal hairs , Which was 139 ± 14.11, the larvae had the highest mortality rate of 53.33% ± 0.09% on the back of the cowpea leaves.The second-instar larvae had the smallest detached rate of 6.67% ± 0.03% on the back of the cowpea leaves, In the cowpea leaves off rate of 100% .To sum up, cowpea, cucumber leaf juice on the success rate of L. sinensis larvae survival is not significant, hooked epidermal hair on larvae of the straight grass larvae have died, indicating that non- The physical properties of the target plants are unfavorable factors in adapting the natural enemies to insects.