Analysis Of Leaf Rolling Behavior And Population Dynamics Differences Of Two Species In Attelabidae

Leaf weevil is a kind of small herbivorous insect belonging to Coleoptera:Attelabidae.A series of behaviors,such as the selection,cutting,folding,curling and rolling on host leaves,will be routinely performed prior to its oviposition.As a result,the eggs is implanted into the leaf roll through the ovipositor and finally transformation to adult insect by undergoing sequential progress of incubation,feeding until adult emergence.In present study,two species of leaf weevil,Apoderus dimidiatus and Apoderus sp.was selected as research objects,while the latter is a kind of parasitic insects on Mucuna sempervirens.The study was conducted in the planting region of Mucuna sempervirens and Rosa chinensis Jacq,which is respectively located around the library and in the farm of Sichuan Agricultural University.By means of recording the information of leaf rolls,adult insects and host plants over 2018,combined with biometric analysis methods,we estimated the difference between the reproductive mode and population dynamics of two species,hoping to provide further comprehensive research basis on its reproductive strategy and more theoretical foundation on its biological control.The results can be summarized as follow:(1)totally 125 and 360 Apoderus dimidiatus and Apoderus sp.was found respectively.The leaf cutting methods were similar and both single-cutting(78 in Apoderus dimidiatus and 348 in Apoderus sp.)and double-cutting(37 in Apoderus dimidiatus and 12 in Apoderus sp.)methods were found in two leaf weevils.However,full-cutting dropped method exits only in Apoderus dimidiatus.(2)the two kinds of leaf weevil showed divergent selection tendencies in regard to host plants growth posture,blade morphology,length and width dimensions.The direction of leaf cutting was random in Apoderus dimidiatus while Apoderus sp.preferred to cut along the side near the petiole.(3)the two kinds of leaf weevil are both two generations a year and showed migration behavior when spawning.This migration behavior in Apoderus sp.was related to its eclosion at the same time.(4)Apoderus dimidiatus were more sensitive to humidity and its eclosion rate was lower than Apoderus sp..