Effects of different foods on the growth and reproduction of the rice stem borer Chilo suppressalis
Author of the article:YANG Zhou** TANG Guo-Ping HAN Rui-Cai ZHU Shan HUANG Ren-Liang***
Author's Workplace:Rice Research Institute, Jiangxi Academy of Agricultural Sciences, National Research Center for Rice Engineering, Nanchang 330200, China
Key Words:Chilo suppressalis; artificial diet; cultivated rice; wild rice; larval period; reproductive capacity; frequency distribution
Abstract:
[Aim] To assess the effects of different foods on the
growth and reproduction of striped stem borer (Chilo suppressalis). [Methods] Striped stem borer larvae were
reared on either an artificial diet, cultivated rice, or wild rice, and their growth, uniformity of
development and reproductive capacity on each food
type were measured and compared. [Results] Larvae survived on the artificial
diet, rice and wild rice for 32.3, 26.0 and
22.5 d, respectively, and attained sixth-instar weights of 69.8, 71.9 and 75.5
mg, respectively. Significant differences were observed between larval periods
and sixth-instar weights of larvae reared on the artificial diet and wild rice (P<0.05). The frequency distribution of the weight of larvae and
pupae fed on wild rice was more normally distributed, and their
development was more uniform. The pupal period
of larvae fed the artificial diet reached 8.3 d; noticeably longer than
that of those that fed cultivated or wild rice (P<0.05). The larval survival rate, pupation
rate, pupal weight, and number of adults produced,
were highest in larvae fed on wild rice and lowest in those fed the artificial
diet. A greater proportion of the larvae that were
fed wild rice completed their
life cycle and these also attained higher pupal
weights and adult fecundity. Food type had no significant
effect the number of eggs laid or the hatching rate (P>0.05). [Conclusion] C.
suppressalis larvae that feed on wild rice develop
quicker, have higher pupal weight, more uniformity of development, and higher fecundity.