Study on Phototactic Behavior of Dinotiscus armandi

CHEN You;LUO Changwei;CHEN Lihua;Chongqing City Management College;

Dinotiscus armandi;;phototaxis;;monochromatic light;;ultraviolet light;;violet light

Dinotiscus armandi is a major parasitic wasp of Pissodes punctatus,which is a destructive stemboring pest attacking Pinus armandi,an important afforesting pine in Southern China. In order to avoid D.armandi being killed when light traps P. punctatus,this study dealt with the visual behavior response of D. armandi to nine monochromatic lights( ranging from 340 nm to 689 nm with about 40-nm step). The results demonstrated that D. armandi could be attracted by eight of nine monochromatic lights,the exception being red light( 649 nm),which implied broad sensitivity to the spectrum of light. D. armandi was most sensitive to ultraviolet( 340 nm),violet( 415 nm),and green-yellow( 549 nm) light. The averaged tendency displacements of the wasp in one minute were 23. 55 cm,20. 09 cm and 19. 28 cm during its tendency to 340 nm,415 nm and 549 nm light. And the averaged tendency rates of the wasp were88. 0%,80. 0%,76. 0% separately to three lights in the same order. Thus,D. armandi is found to be a phototactic insect,and its sensitive spectrum overlaps the sensitive spectrum of P. punctatus much more,as a result,using monochromatic light to monitor the population of P. punctatus and D. armandi has wider application field than to control P. punctatus.