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棉 花 学 报 Cotton Science 2008，20(2)：105-109
Influence of Host Plants on Larval Development, Adult Fecundity and Flight Ability of the Common Cutworm，Spodoptera litura Abstract：Effects of host plants on larval developmental duration，pupal weight，fecundity and flight ability of the common cutworm Spodoptera litura，were investigated in the laboratory. The experimental results indicated that there were significant differences in larval developmental duration and survival rate, pupal weight and adult eclosion while the larvae fed on different host crops. The individuals that fed on the artificial diet presented a larval developmental duration of 18.11 d, which was significantly shorter than those on cabbage (20.13 d), soybean (20.45 d), and cotton (20.76 d). The larval survival rates on the artificial diet (91.80%) were significantly higher than thse on cotton (75.47%),cabbage (73.68%) and soybean (72.22%). However, there were no significant differences in the adult longevity and pre-oviposition period among the four treatments. The fecundity for the adult from the artificial diet reached to 2141 eggs per female, which was significantly higher than these on cabbage (1879.5 eggs), cotton (1855 eggs), and soybean (1789.5 eggs). Based on a 15-hour tethered-flight test of the adults, moths from the larvae reared on the cabbage could have a much stronger flight than those from the soybean and the cotton, although it was slower than that from the artificial diet treatment. For the three-days-old moths ， the adults from the larval reared on the cabbage could fly 6.77 h and 29.0 2 km, which were significantly higher than those from the soybean by 4.88 h and 18.58 km, and from the cotton by 5.18 h and 18.97 km. These results suggest that the moths from the best host plants in larval stage possess stronger flight ability than those from the poor hosts and migratory activity of the pest, a direct behavior response of the adults to poor environment.
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