柑桔炭疽病菌潜伏侵染的研究——Ⅳ.柑桔炭疽病的发生与树体营养的关系

STUDIES ON LATENT INFECTION OF CITRUS ANTHRACNOSE CAUSED BY COLLETOTRICHUM GLOEOSPORIOIDES PENZ

研究表明树体的营养状态与柑桔炭疽病菌由潜伏状态转为活跃状态与寄主发病有关。树体健壮,即叶片全磷、全钾含量高,秋冬季节含氮化物积累多则发病较轻。经复壮措施处理后,重病树体的生长势能逐渐回升。

Conidia of Colletorichum gloeoprioides germinated and formed appressorium on young leaves (14-day-age) of Citrusunshin Marc. within 24 hours after inoculation. Four days later, infection hyphae occurred from appressorium and pierced the cuticle or stomate.Some liyphae formed in the intracells of the epidermis later, but the hyphae remained quiescent untill the leaves were wounded, leading to formation typical an thranose stroma.