摘要
向日葵霜霉病菌Plasmopara halstedii(Farl.)Berl.& de Toni在5—25℃条件下均可侵染寄主,以10—15℃为侵染适温。对不向苗龄幼苗进行人工接种,3—14天的幼苗均被侵染,3天幼苗为最感病,发病率随植株苗龄增大而递减。病菌侵入寄主后,在恒温15℃、20℃、25℃4组及变温8℃和15℃、13℃和20℃、18℃和25℃、23℃和30℃条件下均可发病,恒温20℃及变温13℃和20℃发病率最高,恒温30℃及变温28℃和35℃不发病。
The downy mildew [Plasmopara halstedii (Farl.) Berl. et De Toni] infects sunflower between temperature 5-25℃ and the optimum temperature of the infection is 10-15℃.The seedling of 3-14 days could be infected, but those of 3-day are most susceptible.The systemic symptoms occurred at the constant temperature 15℃, 20℃ and 25℃ as well as the alternating temperature 8℃ and 15℃,13℃ and 20℃,18℃ and 25℃,23℃ and 30℃. The highest rate of the symptoms is at constant temperatura 20℃ and alternating temperature 13℃ and 20℃. There is no sporulation at constant temperature 30℃ and alternating temperature 28℃ and 35℃.
出处
《植物病理学报》
CAS
CSCD
北大核心
1991年第1期37-40,共4页
Acta Phytopathologica Sinica
基金
农业部资助的七
五重点科研项目
