On September 6th, Wei Hulin of Dangtu County in Anhui Province came to the telephone to report that the heading of rice on 10 acres of land had been for more than half a month. Now there is a panicle and neck rot. The diseased plant has black and dry head and neck, and the diseased strain rate reaches 30. %. Shen Weixian, Anhui Province, also came to the telephone and said that on his 3 acres of land, a panicle plague occurred in the rice. The diseased plant had a black neck at the panicle neck section, and some of the panicles had died. The diseased plant rate reached 8-10%, and the earing rate was 10%. -15 days. They asked if there is any medicine that can prevent and control rice after panicle blast.
Panicle blast is rice blast that occurs at the neck of the ear. The lesions were watery brown spots in the initial stage and gradually expanded to brown or dark green. Early onset of more than the formation of white panicles, late onset of pods increased, reduced grain weight, affect the quality of rice. Cobs and branches can also be affected, and the symptoms are similar to those of the panicle neck. When the humidity is high, gray mold layer can be produced on the above affected parts.
Rice is affected by the old and tender tissues of the rice blast infection site, which has an impact on the disease resistance. The general panicle neck is most susceptible to disease at the heading stage, and the disease resistance gradually increases after 6 days of heading. This is because rice leaf sheaths are loose after opening the ear, which facilitates the invasion of rice blast pathogens. At the same time, the ear and neck positions are relatively young when the cobs are just extended. This is the weakest part of rice plants, and pathogens are easily invaded. Weather conditions at break and heading are important factors in determining the occurrence of panicle blast. Temperatures at 20-30°C, field humidity above 90%, and rice plants maintaining a layer of water film for 6-10 hours, the conidia of rice blast are most likely to germinate and invade. At heading, if the rain is wet and the temperature drops below 20°C for 1 week, the disease resistance of the rice will be reduced and the panicle blast will be serious.
Prevention of panicle blast, generally in the beginning of the beginning of the break (10-15% of the whole field rice break period) medication. In many places this year, the rice heading and heading stage encounters continuous rainy weather, which is conducive to the occurrence of rice blast disease. For Huaidao 9, Huajing 6, Xudao 3, and Xudao 4 cultivars with the same sensation or medium sensation, they should be used once more during the full heading stage (80% when heading) to ensure effective control. . The main drugs for prevention and control are rice bran, tricyclazole and imidamide.
Regarding panicles and neck ridges, the emphasis is on prevention and control. The key is to seize the drugs during the two periods of the heading period and the full heading period. Shortly after the panicles of rice were found, a small amount of rice plants in the field had just begun to develop, and spraying rice bran, metoprolol, methotrexate, and other drugs was performed in time, which had a certain therapeutic effect. Twenty days after head-to-ear spike, the occurrence of panicle-necked tendencies became stable, and it was difficult to recover the loss with medication.
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