在北卡罗来纳州苹果炭疽病虽不经常发生,但确是一种很严重的病害。此病通常在6月末开始发生,到8月中旬可造成百分之百的果实腐烂。有人报道过未成熟的果实对炭疽病具有抗病性,可是也有报道过相反的结果。在美国东南部,关于未成熟的果实对炭疽病感病性的了解,在苹果病害防治上对减少用药量或延长喷药间隔时间是极其重要的。苹果炭疽病菌有较短的潜育期,并在病果上产生大量孢子,因此条件适合时就能迅速流行。一旦 Although anthracnose is infrequent in North Carolina, it is indeed a very serious disease. The disease usually begins at the end of June and can cause 100% fruit decay by mid-August. It has been reported that immature fruit is resistant to anthracnose, but opposite results have also been reported. In the southeastern United States, understanding of anthracnose susceptibility to unripe fruit is of crucial importance in the prevention and control of apple diseases to reduce the dosage or extend the interval between spraying. Apple anthracnose has a short incubation period, and produce a large number of spores on the disease, so the conditions can be quickly prevailed. once