森林病害给林业生产造成的损失是严重的,据国外的估计,它比虫害和火灾引起的损失还要大。但这种损害比较隐蔽.没有虫害和火灾那样引入注目。有些森林病害防治很困难,例如榆树荷兰病、板栗疫病等,在国外开展研究,已经近一个世纪了,但至今 The damage caused by forest diseases to forestry production is serious, and it is estimated abroad that it is more harmful than pests and fires. However, this damage is rather subtle, and no pests and fires attract attention. Some forest diseases are difficult to control, such as the elm Dutch disease, chestnut blight, etc., carried out research abroad, it has been nearly a century, but since