Effects Of Different Tea Varieties On Odor Selection Of Larvae And Oviposition Preference Of Adult Of Ectropis Obliqua

Tea is one of the most important economic crops in China.The tea geometrid,Ectropis obliqua Prout,is one of the most serious pests in the tea garden.The outbreak of tea geometrid can cause a full loss of tea product.The main control measure for tea geometrid is the chemical control,which seriously affects the quality of tea.Studying the behavior of tea geometrid can lay a foundation for further control of tea geometrid.In this paper,the effects of the larval feeding experience on the odor preference of the larvae and adult oviposition were studied.And the influence of the transient learning experience of adult after the emergence on the oviposition preference were studied.Tea varieties of Fuyun NO.7(FY),Fuding Dabai(FD),Shuixian(SX)and Huang Dan(HD)were used to examin the preference of tea geometrid to different host plants.(1)The preference to host pant of the neonate larvae of second generation feeding on the mixture of four varieties is:FY=FD>SX>HD.(2)The preference to host pant of the neonate larvae of second generation feeding on different varieties of tea is:FY=FD,FY>SX,FY>HD at the condition of FY as the host;FD=FY,FD>SX,FD>HD at the condition of FD as the host;SX=FY,SX=FD,SX>HD at the condition of SX as the host;HD=FY,HD=FD,HD=SX at the condition of HD as the host.(3)The preference of the neonate larvae of second generation feeding on different varieties of tea after feeding on the same variety for 24h is:FY>FD,FY>SX,FY>HD at the condition of FY as the host;FD>FY,FD>SX,FD>HD at the condition of FD as the host;SX=FY,SX>FD,SX>HD at the condition of SX as the host;HD=FY,HD>FD,HD=SX at the condition of HD as the host.(4)The preference for host plant of the neonate larvae of sixth generation feeding on different varieties of tea is:FY>FD,FY>SX,FY>HD at the condition of FY as the host;FD>FY,FD>SX,FD>HD at the condition of FD as the host;SX=FY,SX=FD,SX>HD at the condition of SX as the host;HD=FY,HD=FD,HD<SX at the condition of HD as the host.(5)The preference of the neonate larvae of the sixth generation feeding on different varieties of tea afrter feeding on the same variety for 24h is:FY>FD,FY>SX,FY>HD,at the condition of FY as the host;FD>FY,FD>SX,FD>HD,at the condition of FD as the host;SX=FY,SX>FD,SX>HD,at the condition of SX as the host;HD>FY,HD>FD,HD>SX;at the condition of HD as the host,which indicated that feeding experience can improve the odor selection of larvae.The preference of adult feeding on different tea varieties was investigated.There was no significant difference in the oviposition preference of adult of the second generation feeding on the mixture four varieties.The second-and sixth-generation of adults with and without the experience of feeding on different varieties had the same oviposition preference to host plants:FY>FD=SX=HD,at the condition of FY as the host;FD>FY=SX=HD,at the condition of FD as the host;SX>FY=FD=HD at the condition of SX as the host;HD>F Y=FD=SX,at the condition of HD as the host.The adult prefered to lay eggs on the host plant which the larvae feed on.Twelve volatiles were identified individually from four tea varieties during 8:00-12:00.During 20:00-8:00,seven volatiles were identified from FY,eight volatiles from FD,ten volatiles from SX and seven volatiles from HD.The volatiles mainly consisted of alkanes,hydrocarbons,aldehydes,esters and naphthalene.Four sensilla in the larval head were observed by SEM,including sensillum trichodeum,sensillum chaeticum,sensillum basiconicum and sensillum styloconica.Seven sensilla in the adult antennae were observed by SEM,including sensillum trichodeum,sensillum chaeticum,sensillum basiconicum,sensillum styloconica,sensillum furcatea,sensillum squamiformium,and sensillum auricillica.