Sharma Shubham, Sharma Prem Lal, Sharma Prajjval, Verma Subhash Chander, Sharma Nidhi, Sharma Priyanka
Department of Entomology, Dr YS Parmar University of Horticulture and Forestry, Solan, HP 173230, India.
Bull Entomol Res. 2024 Aug;114(4):514-523. doi: 10.1017/S0007485324000312. Epub 2024 Aug 27.
The fall armyworm (FAW), (J.E. Smith) (Lepidoptera: Noctuidae) is a highly destructive polyphagous pest that primarily damages maize. Maize is considered a most versatile crop for growing intercrops due to the wide row it needs. Maize-pea intercropping is preferred by small and marginal farmers worldwide due to various advantages including higher yield and improved economic benefits. However, the success of this intercropping system may be hampered if pea could sustain the FAW population. Thus, to clarify the fitness and potential effect of on pea, we analysed the survival and development of fed on pea leaves in the laboratory and constructed age-stage and two-sex life tables. Results showed that FAW successfully completed its life cycle when fed on pea and produced fertile offspring. The pre-adult duration was significantly higher on pea than maize. The net reproductive rate, intrinsic and finite rate of population increase on pea (135.06 offspring per individual, 0.12 offspring per individual per day and 1.13 times per day) were all significantly different from those on maize (417.64 offspring per individual, 0.19 offspring per individual per day and 1.21 times per day). The probability of survival of at each stage was lower when fed on pea leaves than that of maize-fed larvae. Due to the overlapping growth periods of the maize and pea, can easily proliferate throughout the year by shifting between adjacent crops. Thus, this study revealed the adaptability of for pea and provides the foundation for further assessment of FAW risk to other inter-crops.
草地贪夜蛾（Spodoptera frugiperda (J.E. Smith)，鳞翅目：夜蛾科）是一种极具破坏性的多食性害虫，主要危害玉米。由于玉米所需行距宽，它被认为是种植间作作物的最通用作物。由于包括高产和提高经济效益在内的各种优势，玉米 - 豌豆间作受到全球小农户和边际农户的青睐。然而，如果豌豆能够维持草地贪夜蛾种群数量，这种间作系统的成功可能会受到阻碍。因此，为了阐明草地贪夜蛾对豌豆的适合度和潜在影响，我们在实验室分析了取食豌豆叶片的草地贪夜蛾的存活和发育情况，并构建了年龄 - 阶段两性生命表。结果表明，草地贪夜蛾取食豌豆时能够成功完成其生命周期并产生可育后代。在豌豆上的成虫前期持续时间显著长于玉米。豌豆上的净繁殖率、内禀增长率和种群有限增长率（每头个体135.06个后代、每头个体每天0.12个后代和每天1.13倍）与玉米上的（每头个体417.64个后代、每头个体每天0.19个后代和每天1.21倍）均有显著差异。取食豌豆叶片时草地贪夜蛾各阶段的存活概率低于取食玉米的幼虫。由于玉米和豌豆的生长季节重叠，草地贪夜蛾可以通过在相邻作物之间转移而轻松地全年增殖。因此，本研究揭示了草地贪夜蛾对豌豆的适应性，并为进一步评估草地贪夜蛾对其他间作作物的风险提供了基础。
