Moonga M N, Davis J A
Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803 (
J Econ Entomol. 2016 Aug;109(4):1713-9. doi: 10.1093/jee/tow156. Epub 2016 Jul 3.
The soybean looper, Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae), is a major defoliating pest of soybeans, Glycine max (L.) Merrill, in Louisiana. However, other alternate host crops in the agroecosystem have the potential to impact C. includens populations. Life table statistics of C. includens on four host plants were evaluated. C. includens larvae were fed leaves of three cotton Gossypium hirsutum L. cultivars 'DP 143 B2RF,' 'DP 174 RF,' and 'PHY 485 WRF'; cowpea Vigna unguiculata (L.) Walpers 'California Blackeye'; three soybean cultivars 'Lyon,' 'PI 227687,' and 'RC 4955'; and sweetpotato Ipomoea batatas (L.) Lamarck 'Evangeline.' All C. includens larvae reared on cotton cultivars DP 143 B2RF and PHY 485 WRF experienced 100% mortality during the first instar. Total developmental period of preadult C. includens was significantly shorter on cotton DP 174 RF and cowpea California Blackeye but longer on sweetpotato Evangeline. Sweetpotato Evangeline had the highest amount of leaf tissue consumed and soybean Lyon had the least. Pupal weight was highest when insects fed on cotton DP 174 RF and lowest on soybean PI 227687. Life table statistics showed that the highest intrinsic rate of increase and net reproductive rate were attained when insects were reared on cotton DP 174 RF and cowpea California Blackeye whilst the lowest were recorded on soybean PI 227687. This study provides valuable information on the role of alternative host crops on the partial life history of C. includens in Louisiana agroecosystems.
大豆夜蛾，即金叶夜蛾（Chrysodeixis includens (Walker)，鳞翅目：夜蛾科），是路易斯安那州大豆（Glycine max (L.) Merrill）的一种主要食叶害虫。然而，农业生态系统中的其他替代寄主作物有可能影响金叶夜蛾的种群数量。研究评估了金叶夜蛾在四种寄主植物上的生命表统计数据。用三个棉花品种“DP 143 B2RF”、“DP 174 RF”和“PHY 485 WRF”；豇豆（Vigna unguiculata (L.) Walpers）品种“加利福尼亚黑眼”；三个大豆品种“Lyon”、“PI 227687”和“RC 4955”；以及甘薯（Ipomoea batatas (L.) Lamarck）品种“伊万杰琳”的叶片饲养金叶夜蛾幼虫。所有在棉花品种DP 143 B2RF和PHY 485 WRF上饲养的金叶夜蛾幼虫在一龄期都经历了100%的死亡率。成虫前期金叶夜蛾在棉花DP 174 RF和豇豆加利福尼亚黑眼上的总发育时间显著较短，但在甘薯伊万杰琳上较长。甘薯伊万杰琳的叶片组织消耗量最高，大豆Lyon的消耗量最少。当昆虫取食棉花DP 174 RF时蛹重最高，取食大豆PI 227687时最低。生命表统计数据表明，当昆虫在棉花DP 174 RF和豇豆加利福尼亚黑眼上饲养时，其内在增长率和净繁殖率最高，而在大豆PI 227687上饲养时最低。本研究提供了关于替代寄主作物在路易斯安那州农业生态系统中金叶夜蛾部分生活史中作用的有价值信息。
