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成都萵笋霜霉病菌孢子囊寿命很短,生活力只能維持7—10天。在病叶、茎及种子中,均未发現卵孢子。其初侵染来源可能是种子或病組織中潛藏的菌絲。調查結果表明,萵笋霜霉病菌可以藉气流或水流終年侵染,不在活体外休眠。 萵笋霜霉病菌寄主范围小,在6种菊科植物上接种未获成功,表現出明显的专化現象,品种間抗病性亦有显著的差異。
Chengdu lettuce downy mildew spore sac life is very short, vitality can only be maintained for 7-10 days. In diseased leaves, stems and seeds, no oospores were found. The source of its initial infection may be hidden seeds or diseased tissue mycelium. The results show that lettuce downy mildew bacteria can be infested by airflow or water throughout the year, not sleeping in vitro. The low host range of lettuce downy mildew was inoculated successfully on 6 kinds of Compositae plants, showing obvious specialization phenomenon. There was also significant difference in disease resistance among varieties.