Study on the growth development and reproductive ability of Spodoptera frugiperda fed with different plants
The growth,development,and reproduction of Spodoptera frugiperda larvae fed on leaves of sweet potato,millet,green foxtail,sorghum,and rice were studied under indoor conditions,and an experimental population life table was assembled.The results showed that there were no significant differences in the egg hatching rates of S.frugiperda fed on different plants.However,there was a significant difference in the immature period duration:millet-fed group＜sorghum-fed group＜green foxtail-fed group＜rice-fed group＜sweet potato-fed group.The weight of the 5th instar larvae exhibited a significant difference:rice-fed group＜sweet potato-fed group＜green foxtail-fed group＜millet-fed group＜sorghum-fed group.Following the consumption of sweet potato,millet,and sorghum,the mature larvae had two instars,the 6th and the 7th instars.In contrast,the mature larvae that fed on green foxtail had three instars,the 6th,7th,and 8th.There were 7th,8th,and 9th instars of mature larvae feeding on rice.The intergenerational survival rate was in the order of green foxtail-fed group＜rice-fed group＜sorghum-fed group＜sweet potato-fed group＜millet-fed group.The average number of eggs laid per female among treatments was in the order of rice-fed＜green foxtail-fed＜sweet potato-fed＜sorghum-fed＜millet-fed.The net reproductive rates(R0)after feeding five plants were 271.56,467.80,116.24,364.26,and 82.42,respectively,and the intrinsic rates(rm)were 0.12,0.17,0.12,0.17,and 0.09,respectively.In summary,under the present experimental conditions,S.frugiperda could establish populations on all five plants tested.Millet and sorghum were suitable hosts,followed by sweet potato and green foxtail,and rice was relatively less suitable for it.
Spodoptera frugiperdahost plantgrowth and developmentfecundity
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