刺桐姬小蜂对寄主的产卵选择性

研究了刺桐姬小蜂雌虫的逐日产卵量、对寄主的产卵选择性及在不同寄主上子代的生长发育情况.结果表明,雌蜂在交配后第2天开始产卵,第3天达到产卵高峰.刺桐姬小蜂对不同寄主具有产卵选择性差异,在黄脉刺桐与刺桐东方变种上产生的虫瘿量最多,其次是刺桐,在鸡冠刺桐上未发现虫瘿.雌蜂最喜欢产卵于长1-2 cm的未展开或半展开的刺桐幼嫩叶片上,当新梢叶片大于3.5 cm时不产卵.刺桐姬小蜂一般在新梢叶片、叶柄上产生虫瘿,偶尔也在刺桐东方变种的嫩茎上产生虫瘿.黄脉刺桐和刺桐东方变种上虫瘿的出瘿率分别为49.73%和53.32%,虫瘿重量分别为32.90和38.67mg.个-1,在刺桐上虫瘿的出瘿率为0,且虫瘿重量仅为8.99 mg.个-1,虫瘿在幼虫期死亡率最高.

The oviposition preference of Quadrastichus erythrinae Kim to hosts

The daily fecundity and the oviposition preference of Quadrastichus erythrinae Kim were studied,and the growth and development of Q.erythrinae on different hosts were investigated.The results showed that the females began to lay eggs at the second day after mating with a peak at the third day.The host preference for oviposition was significantly different among the hosts tested.The higher hatching rate was found on E.variegata var.orientalis and E.variegata cv.Parcellii than on E.variegata,whereas no eggs appeared on E.cristagalli.The tender leaves at the length of 1-2 cm were preferred,while the leaves over the length of 3.5 cm could′t be laid on.The pest produced galls generally on young shoots,primarily leaves and petioles,but sometimes on tender stems of Erythrina variegata var.orientalis.The rate of the adults coming out of the galls on Erythrina variegata cv.Parcellii and E.variegate var.orientalis were 49.73% and 53.32% respectively,and the weight of each gall was 32.90 mg and 38.67 mg respectively.The adults can′t come out of the galls on E.variegate and the weight of each gall was only 8.99 mg.The mortality rate of larva was highest.