苹果梨“干基湿腐病”是由真菌类疫霉属恶疫霉菌引超,主要为害苹果梨幼树及苗木,7—9月发病最多,使其干基部变黑、坏死、干缩,直至全株死亡,发病周期短(7—10天),为害严重。此病在夏季炎热季节如遇连续阴雨,长时间树干周围积水,以及干基杂草密集,间作物匍匐树干,均利于发病。为了防治此病,我们自1977年起,对该病采取了渗灌防治试验,使苹果梨发病死亡率下降到0.5%以下,取得了明显的效果。所谓渗灌,是指加防水圈和垄栽两种方法。加 Apple pear “dry basis of wet rot” is caused by the fungus Phytophthora Phytophthora lead ultra, the main damage to apple pear saplings and seedlings, the most incidence from July to September, making it dry base black, necrosis, shrinkage, Until the whole plant died, the incidence of a short period (7-10 days), serious damage. The disease in the hot summer season in case of continuous rainy rain, prolonged stagnant water around the trunk, and dense weed-based dry, intercropping crop trunk, are conducive to the incidence. In order to prevent and treat this disease, we started to seep prevention and control test on the disease since 1977, so that the incidence of apple pear mortality dropped to 0.5% or less, and achieved remarkable results. The so-called seepage irrigation, refers to the water ring and ridge planting two ways. plus