
Effects of Five Different Crops on Development and Fitness of Spodoptera frugiperda
QIULiangmiao, LIUQiquan, CHENXiuqin, LUXuesong, LIUBipao, HEYuxian
Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (5) : 29-35.
Effects of Five Different Crops on Development and Fitness of Spodoptera frugiperda
The study aimed to clarify the host fitness and potential damage of the major invasive insect of Spodoptera frugiperda to different crops besides maize, providing a scientific basis for damage risk assessment of host shift and the population monitoring of the pest. The effects of individual development, survival rate and fecundity of S. frugiperda fed on different crops of pepper, tomato, sugarcane, coix and ginger were determined indoors, and then were compared and analyzed with maize as the control. Furthermore, fitness of S. frugiperda on various crops was evaluated based on the population growth trend index (I). The results showed that the adaptability of S. frugiperda on different crops was declined significantly compared with the preferable host of maize. The effects of five different crops on S. frugiperda mainly manifested as the developmental duration prolonged, survival rate reduced, pupal weight and the adults emergence rate declined, the shorter longevity of adults, less average eggs laid per female and lower egg hatching rate. Pepper exhibited the most adverse impact on S. frugiperda, such as the larval duration, larval survival rate, pupal weight and female longevity of the pest fed on pepper were 37.40 d, 18.52%, 0.1130 g and 5.25 d, respectively, while those on maize were 16.52 d, 92.59%, 0.2178 g and 11.74 d, respectively. The results showed that S. frugiperda feeding on pepper could not finish its life cycle. Although the S. frugiperda could develop normally and completed its whole life cycle fed on tomato, sugarcane, coix and ginger, but the relative fitness wasonly 0.023, 0.107, 0.112 and 0.130, respectively. The population growth trend index (I) of S. frugiperda feeding on maize was 226.38. In conclusion, maize is the most preferable host for S. frugiperda. The crops of tomato, sugarcane, coix and ginger are not the suitable hosts for population reproduction of S. frugiperda. However, S. frugiperdas till can complete its life cycle by feeding on its young leaves, indicating its potential hazard risk, and the risk of pepper is minimal.
invasive pest / Spodoptera frugiperda / host / fitness / crop
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