为明确我国南方近几年新发生的桃枝枯病的发生规律,适时有效防治,采用田间定点连续调查,室内显微观察、分离、鉴定、接种等方法对江苏省无锡市水蜜桃枝枯病的消长规律,病菌越冬、初侵染、再侵染及侵染途径进行了研究。结果表明:不同品种间桃枝枯病发生有显著差异,‘柳条白凤’和‘湖景蜜露’的自然病枝率分别为80%和60%左右;桃树下部病害发生率一般高于上部;6月下旬至7月是病害发生的高峰期。病菌以菌丝或分生孢子在室内、田间、土表和土壤耕作层病枝上越冬。通常3月初产生分生孢子器。孢子捕捉结果显示,3月中旬分生孢子开始释放,3月下旬至4月中旬释放达到高峰,之后释放量逐渐减少;雨后分生孢子释放量明显增加;6月下旬田间发病新梢上开始形成分生孢子器,并出现空腔现象。病菌只能通过伤口侵染枝条和果实,但不能侵染叶片。研究结果揭示了桃枝枯病的发生规律,为该病的适时防控奠定了基础。 In order to clarify the law of occurrence of peach-blight in recent years in southern China and to prevent and control it timely and timely, the growth and decline of peach-branch blight in Wuxi, Jiangsu Province were studied by continuous field investigation, indoor microscopic observation, isolation, identification and inoculation. Law, overwintering germs, primary infection, re-infection and infection were studied. The results showed that there were significant differences in the occurrence of peach blight among different varieties. The natural blight rates of ’Wicker Baifeng’ and ’Lake View Honeydew’ were 80% and 60%, respectively. The incidence of pest lower disease was generally higher than that of the upper part ; Late June to July is the peak of the disease. Pathogenic bacteria in mycelium or conidia in the indoor, field, soil surface and soil cultivation layer of winter branches. Conidia are usually produced early in March. The results of spore catching showed that the conidia began to release in mid-March and peaked from the end of March to the middle of April, and then gradually decreased. After the rain, the release of conidia increased significantly. Formation of conidia, and the phenomenon of cavity. Germs can only invade branches and fruits through the wound, but they can not invade the leaves. The results revealed the law of peach blight and lay the foundation for timely prevention and control of the disease.