猕猴桃溃疡病主要发病条件研究

Main Factors Affecting Kiwi Fruit Canker

猕猴桃溃疡病病原细菌（ＰｅｓｕｄｏｍｏｎａｓｓｙｒｉｎｇａｅＰＶ．ａｃｔｉｎｉｄｉａｅ）在适宜条件下，潜育期最短１９ｄ。该病发生早迟和为害程度与极端低温出现的早迟和低温程度关系密切。当极端低温达－１２℃以下时５ｄ内发病，此年将成重病或严重病年；当旬平均气温达２０℃时，病害停止漫延为害。品种的抗性对溃疡病的为害起着决定性作用。

The shortest latent period of Kiwi fruit Canker (Pseudomonas syringae PV. actinidiae ) was 19 days under the optimum conditions.The occurrence time and severity of the disease was closely relative to the date and degree of the yearly minimum temperature.The disease would emerge on the fifth day as the minimum temperature was under -12℃.Which showed the disease would be very severe in the year. However,the disease would not develop further when the average of ten day temperature got to 20℃.The varietal resistance played a decisive role in the occurreance and epidemicity of the disease.