果树腐烂病复发的原因,主要有以下3个方面:一是腐烂的病斑皮层刮除不彻底,残留的病菌继续扩展并危害。二是刮治病斑边缘的伤口愈合不良,重新受到病菌的浸染。三是病斑处的木质部带菌,刮治后仍在不断扩展,从而侵害原病斑及边缘的树皮。可采取以下措施进行防治:一、夏秋季节,是果 Recurrence of fruit tree rot causes, mainly in the following three aspects: First, decay of the diseased cortex scratch is not complete, the residual bacteria continue to expand and endanger. The second is to cure the lesion edge of the wound healing is poor, re-infected by bacteria. Third, lesions at the xylem carrying bacteria, scraping is still continuing to expand, thus infiltrating the original lesion and edge of the bark. Can take the following measures for prevention and treatment: First, the summer and autumn, is fruit