玉米面水分含量对谷蠹生长发育和繁殖的影响

本文研究了玉米面的水分含量(21.33%、19.35%、18.67%、13.64%、10.98%)对谷蠹Rhyzopertha dominica Fabricius生长发育及产卵的影响。结果表明:玉米面的水分含量对谷蠹幼虫的发育历期影响显著,对卵和蛹的发育历期影响不显著;谷蠹卵的孵化率、幼虫和蛹的存活率在玉米面水分10.98%～19.35%的条件下增大,在玉米面水分21.33%条件下下降;谷蠹幼虫龄数也受到玉米面水分含量的影响,玉米面水分19.35%条件下幼虫龄数在3～5间变化,10.98%条件下幼虫龄数在3～8间变化;在试验的5种玉米面水分中,谷蠹只在19.35%和18.67%条件下才产卵,19.35%条件下日均产卵量和产卵期均大于18.67%条件下的相应值。

Influence of moisture of maize flour on the development and reproduction of Rhyzopertha dominica

The effect of the moisture content of maize flour on the development and reproduction of Rhyzopertha dominica（Fabricius） was investigated.The results show that the moisture content of maize flour had a significant influence on the developmental duration of larvae,but no obvious influence on that of eggs and pupae.The survival rate of eggs,larvae and pupae increased as the moisture content of maize flour increased from 10.98% to 19.35%,but decreased when this reached 21.33%.The number of larval instars was influenced by flour moisture content,ranging from 3 to 5 at 19.35% moisture but from 3 to 8 at 10.98% moisture.Female insects laid eggs only when the moisture content was 19.35% and 18.67%,and that the average daily number of eggs and average oviposition time per female was greater at 19.35% than at 18.67% moisture.