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为了明确落地小花、小果对荔枝园霜疫霉初侵染源萌发的作用和该病害流行的起点,采用树盘下覆地膜的方法,2011~2013年连续3年在果园检测落地小花、小果和树上小花、小果霜疫霉感病率。结果表明,树盘下的越冬菌源是霜疫霉病主要初侵染源,覆地膜可以隔离树盘下初侵染源对落地小花、小果的侵染,落地小花、小果与树盘下越冬菌源的接触是荔枝霜疫霉病在果园流行的起点,从而间接证明了荔枝园霜疫霉初侵染源萌发的关键物候期为开花期到第2次生理落果期。
In order to clarify the role of small flowers on the germination of the primary infection source of Phytophthora capsici in Litchi Park and the starting point of the disease epidemic, the method of covering the ground film with tree trays was used to detect the florets in the orchard for three consecutive years from 2011 to 2013, Fruit and trees flowers, small fruit fry Phytophthora infestation. The results showed that the overwintering fungus under the tree tray was the main source of initial infection of Phytophthora infestans. The overlying film could isolate the primary infection source under the tree tray from the florets, the small fruit, the florets, Under the contact of the overwintering bacteria source is the starting point of the epidemic of litchi fritillary blight in the orchard, which proves indirectly that the key phenophase of the initial infection source of litchi orchard is the flowering to the second physiological deciduous period.