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荔枝霜疫病病原菌在11～30%均可形成游动孢子囊,在22～25℃时,孢子囊产量最高,孢子囊在8～22℃间均能萌发形成游动孢子,但在26～30℃时萌发则形成芽管。在8～16℃间的萌发率最高。游动孢子的形成在14℃下只需20分钟,10℃下只需30分钟,游动孢子从形成至释放在14℃及10℃下所需时间分别为10分钟及20分钟。荔枝霜疫霉在侵染过程的各个时期中,都要求高湿度,否则不能危害,在高湿条件下,此菌在11～30℃均可侵入荔枝果,在18℃下只需5分钟便可侵入。最适扩展温度为25℃,在25℃下,潜育期不到1天,在18℃下为2～3天,在11℃下可延长到7天,在30℃潜育期虽短,但产生的孢子囊数量很少,出现期只有1天。危害荔枝果的接种体主要是游动孢子,荔枝结果期间的5月,多连雨天,病原菌的再侵染频繁,可能是荔枝霜疫病在广州地区经常流行的主要原因。
Lyophyllus frost blight pathogen in the formation of zoosporangia at 11 ~ 30%, at 22 ~ 25 ℃, the highest yield of sporangia, sporangia at 8 ~ 22 ℃ germination can form zoospores, but in 26 ~ 30 Germination at ℃ germinated germ tube. The highest germination rate was between 8 ~ 16 ℃. The formation of zoospores takes only 20 minutes at 14 ° C and 30 minutes at 10 ° C. The time required for the formation of zoospores from formation to release at 14 ° C and 10 ° C is 10 minutes and 20 minutes, respectively. Phytophthora Lichenpitum requires high humidity during various stages of the infection process, otherwise it can not be harmful. Under high humidity conditions, this bacterium invades lychee at 11-30 ° C and only takes 5 minutes at 18 ° C Invade. The optimum extension temperature is 25 ℃, the incubation period is less than 1 day at 25 ℃, 2 ~ 3 days at 18 ℃, 7 days at 11 ℃, and the incubation period at 30 ℃ is short, However, the number of sporangia produced is small, the appearance of only 1 day. The inoculum endangering litchi fruit is mainly zoospore, lychee during the May, more rainy days, re-infection of pathogens frequently, may be the main reason for the frequent epidemic of litchi frost disease in Guangzhou.