Microscopic examinations showed that with the treatment of the conidia suspension of T longibrachiatum, the newly hatched second stage juveniles became dull, stiff, and with a wave-like distortion at the 2th day These n appeared to be in a state of paralysis with little movement. Four days after infection, most of the second stage juveniles were stiff and started showing the stylet of dead second stage juvenile(Fig. 1A). At the 6th day, the second stage juveniles became rigid and immobile, some of them changed color, and the conidia of T longibrachiatum adhered or parasitized on the surface ofsecond stage juveniles(Fig.1B). A large number of conidium surrounded second stage juveniles at the 8th day(Fig. 1C) The conidia of T longibrachiatum became parasitized and reproduced on the surface of second stage juveniles, germinated with a large number of hyphae and penetrated the integument at the 10th day(Fig. 1D and E) The dead second stage juveniles became deformed at the 12th day, especially the parasitic sites became shrunk(Fig. 1F) at the 12 day. Even some second stage juveniles began to dissolve, or dissolved at the 14th day(Fig. 1G) In contrast, the body's color and shape of the second stage juveniles remained intact in the control group(i.e., inoculated with juveniles but not with T. longibrachiatum) (Fig. 1H)