Department of Entomology, College of Nature Resources and Environment, South China Agricultural University, Guangzhou, 510642, The People's Republic of China.
J Insect Sci. 2010;10:117. doi: 10.1673/031.010.11701.
The tropical armyworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae), is an important pest of tobacco, Nicotiana tabacum L. (Solanales: Solanaceae), in South China that is becoming increasingly resistant to pesticides. Six potential trap crops were evaluated to control S. litura on tobacco. Castor bean, Ricinus communis L. (Malpighiales: Euphorbiaceae), and taro, Colocasia esculenta (L.) Schott (Alismatales: Araceae), hosted significantly more S. litura than peanut, Arachis hypogaea L. (Fabales: Fabaceae), sweet potato, Ipomoea batata Lam. (Solanales: Convolvulaceae) or tobacoo in a greenhouse trial, and tobacco field plots with taro rows hosted significantly fewer S. litura than those with rows of other trap crops or without trap crops, provided the taro was in a fast-growing stage. When these crops were grown along with eggplant, Solanum melongena L. (Solanales: Solanaceae), and soybean, Glycines max L. (Fabales: Fabaceae), in separate plots in a randomized matrix, tobacco plots hosted more S. litura than the other crop plots early in the season, but late in the season, taro plots hosted significantly more S. litura than tobacco, soybean, sweet potato, peanut or eggplant plots. In addition, higher rates of S. litura parasitism by Microplitis prodeniae Rao and Chandry (Hymenoptera: Bracondidae) and Campoletis chlorideae Uchida (Ichnumonidae) were observed in taro plots compared to other crop plots. Although taro was an effective trap crop for managing S. litura on tobacco, it did not attract S. litura in the seedling stage, indicating that taro should either be planted 20-30 days before tobacco, or alternative control methods should be employed during the seedling stage.
南方烟田重要害虫草地贪夜蛾 Spodoptera litura（F.）（鳞翅目：夜蛾科）对农药的抵抗力越来越强。本研究评估了 6 种潜在诱集作物对烟田草地贪夜蛾的控制效果。温室试验表明，蓖麻 Ricinus communis L.（大戟目：大戟科）和芋头 Colocasia esculenta（L.）Schott（泽泻目：天南星科）比花生 Arachis hypogaea L.（豆目：豆科）、甘薯 Ipomoea batata Lam.（茄目：旋花科）或烟草更吸引草地贪夜蛾，且芋田行中种植芋头比种植其他诱集作物或不种植诱集作物的行中草地贪夜蛾数量显著更少，前提是芋头处于快速生长阶段。当这些作物与茄子 Solanum melongena L.（茄目：茄科）和大豆 Glycine max L.（豆目：豆科）在随机矩阵的单独地块中种植时，在季节早期烟草地块中草地贪夜蛾数量多于其他作物地块，但在季节后期，芋头地块中草地贪夜蛾数量明显多于烟草、大豆、甘薯、花生或茄子地块。此外，与其他作物地块相比，在芋头地块中观察到草地贪夜蛾被菜蛾啮小蜂 Microplitis prodeniae Rao 和 Chandry（膜翅目：茧蜂科）和稻苞虫绒茧蜂 Campoletis chlorideae Uchida（膜翅目：缨小蜂科）寄生的比例更高。尽管芋头是烟草上防治草地贪夜蛾的有效诱集作物，但它在幼苗期不会吸引草地贪夜蛾，这表明芋头应在烟草种植前 20-30 天种植，或在幼苗期采用替代控制方法。
