STUDIES ON BEHAVIOUR OF GERMINATION OF CONIDIA FROM BEAUVERIA BASSIANA ON THE CUTICLE OF HELIOTHIS ZEA
球孢白僵菌在棉铃虫表皮上萌发的研究

This paper studied on germination process of the conidia of three different virulent strains of Beauveria bassiana with scanning electron microscope (SEM) and transmission electron microscope (TEM). We discovered both high and low virulent strains in the cuticle of Heliothis zea can germinate. The germ tubes of high virulent strains were directional growth and penetrated the cuticle, when it stretched to 1.5 to 2.5 times of conidia length. The germ tubes of low virulent strains grew extensively and less penetrated cuticle. The process of hypha penetrant cuticle could not be sucessive by one step.