Radish Downy Mildew
[Symptoms] mainly damage the leaves. In the beginning of the leaf surface, there are irregular macular chlorotic stains, which gradually expand into polygonal yellow-brown spots. Most of them are 3-7 mm in size, and several lesions can communicatively become larger plaques. White molds can be seen on the corresponding leaves. This is the symptom of the disease (spore cyst and sporangia) and is more pronounced when wet. ã€Pathogen and Pathogenesis】Pero-nospora brassicae var.raphani is a pathogen of the flagellin subphylum. This variant is different from the Brassica variety and the Amaranth variety, which has strong invasiveness to radish and very weak invasiveness to Brassica vegetables (cabbage, cabbage, mustard), and does not infect leeks. Within this variation, there may also be physiological differentiation (ie, there may be different physiological subpopulations with different morphological virulence). There are differences in disease resistance among varieties. Among the 42 radish varieties promoted in China in recent years, the disease resistance to downy mildew is: Full House Red Heart 91-1 (Beijing Academy of Agriculture and Forestry Sciences); Hot White (North Agricultural University); Hongfeng No.1, Hongfeng No.2 (Shenyang) and so on. As for the varieties that generally exhibit strong disease resistance, such as Jinghong No. 1 (Beijing Academy of Agriculture and Forestry Sciences); Fuling Red Heart Radish (Chongqing); Lu Bafen (Inner Mongolia cited from Beijing); Luduo No. 5 (Shandong); Sakura Sakura Radish (Sichuan native species); flower sakura (Sichuan); spring not old round root radish (Sichuan); Liu'an Ma pile radish (Anhui); Henan radish 1 (Henan); Luzhou radish (Hunan); Hefei Qing Whether radish (Anhui) is also resistant to downy mildew has yet to be further observed elsewhere. [control methods] reference cabbage, cabbage downy mildew prevention and control methods.
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