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苹果树腐烂病在早春有一次发病高峰,在此高峰期,主干、主枝上的原发病斑的分布具有明显的方位倾向。不同方位的树皮受日光照射后,皮温比气温高,其增温幅度愈大,增温持续时间愈长,则该方位上的发病点愈密集。因而认为腐烂病早春发病所表现的方位性与此期间树皮受日光照射后的增温有关。按风速1.1～3.8米/秒、低云量0 ～2级,12～14点阳光直射面树皮温度与气温间的关系可以直线回归式表之;t_b(皮温)=7.70 +1.93t_a(气温)。河北省二、三月份由阳光辐射引起树皮增温的条件经常存在。采用秋后涂白保护树体的常发病部位可以降低早春树皮增温、减轻病害,推荐桐油皂白涂剂。
Apple tree rot disease peak incidence in early spring, at this peak, the trunk, the main branch of the primary lesion distribution has a clear orientation. Different directions of the bark by sunlight, the skin temperature is higher than the temperature, the greater the warming rate, the longer duration of warming, the more the incidence of the location of the more intensive. Therefore, it is considered that the rotten disease manifests in the early stage of decay and the bark is affected by the warming after the sunlight. According to the wind speed of 1.1 ~ 3.8 m / s, low clouds of 0 to 2, 12 to 14 direct sunlight bark skin temperature and temperature can be linear regression table; t_b (skin temperature) = 7.70 +1.93 t_a ( Temperature). Hebei Province in March and March caused by solar radiation bark warming conditions often exist. The use of autumn white Tu protection of trees often disease parts can reduce the early spring bark warming, reduce disease, recommend tung oil white paint.