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水葫芦象甲10科12种作物的寄主专一性测定结果表明,在选择性和非选择性条件下,该象甲的幼虫在植株间的转移性极差,大多在被测植物上存活2～5d后死亡,成虫则可能因气温等自然条件不同而在被测植物上存活10～62d,幼虫和成虫均不在被测植物上取食、寄生与产卵。象甲的成虫取食水葫芦叶片的正面叶肉、叶柄上部、匍匐枝与花柄表面形成取食斑,产卵于叶柄上中部;幼虫寄生于叶柄海绵组织内,形成向下的寄生通道,并自叶柄基部钻出在根表面纠集根毛化蛹;高龄幼虫对水葫芦的控制作用明显大于成虫和低龄幼虫。象甲对水葫芦的控制作用随其群体量的增加而逐步提高,当成虫和幼虫总量分别低于15,60头/m2时,对水葫芦的控制作用不明显;当成虫和幼虫总量分别超过25,190头/m2时,控制作用明显增强;当成虫和幼虫总量分别超过130,450头/m2时,天敌对水葫芦的控制作用达到顶峰,最终可使水葫芦密度比对照减少52.69%,株高下降67.19%,单株叶片数减少29.42%,最大叶直径减少41.33%,生物量减少64.82%。
The host-specificity measurements of 12 crops of 10 families of water hyacinth, including 10 species, showed that the larvae of the A. catechu migrated extremely poorly among plants under selective and non-selective conditions and most of them survived 2 After 5 days of death, the adults may die on the tested plants for 10 ~ 62 days due to different natural conditions such as air temperature. The larvae and adults do not feed, parasitize and spawn on the tested plants. Elephantidae adults feed on the frontal mesophyll of the leaves of the water hyacinth. The upper part of the petiole, the stoloniferous branch and the surface of the pedicel form a feeding foraging spot and lay eggs on the middle of the petiole. The larvae parasitize the petiole sponge tissue and form downward parasitic channels. Root petioles were drilled from the base of the petiole to gather root hairy pupae. The control effect of the older larvae on water hyacinth was significantly greater than that of adult and young larvae. The control effect of Weevil on water hyacinth gradually increased with the increase of population. When the total amount of adults and larvae was less than 15 and 60 heads / m2 respectively, the control effect on water hyacinth was not obvious. When the total amount of adults and larvae When the total population of larvae and adults were more than 130,450 heads / m2, the control effect of natural enemies on water hyacinth peaked, and the density of water hyacinth decreased by 52.69% High descend 67.19%, leaf number per plant decreased 29.42%, maximum leaf diameter reduced 41.33%, biomass decreased 64.82%.