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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.

Potential of Trap Crops for Integrated Management of the Tropical Armyworm,Spodoptera liturain Tobacco