Q: What is the problem with this rice? Is there any way to control it?
A: There are many reasons for brown spots on the hull after rice heading. When the rice is heading and flowering, it encounters wind and rain, and the young husk produces wounds due to wind scraping, etc., and is easily infected by saprophytic bacteria, which makes the hulls become black and brown. The gray planthopper sucks juice in the ear layer and secretes honeydew to cause contamination of the bacteria, which also causes the rice husk to become black. The concentration of Jinggangmycin, chlorpyrifos and other drugs applied during the flowering stage of rice heading is too large or used in high temperature and sunny days, which may cause the shell to become black and brown. When the Jinggangmycin, chlorpyrifos and other drugs are used improperly, most of the Yinghua glume in a certain part of the whole ear or ear is damaged. Rice is damaged by grain mites and sclerotium, and the hulls become black and brown. These diseases occur in the flowering stage of rice heading, and the flower is destroyed into empty shells; in the filling stage, the damaged rice grains stop developing and form a valley; in the late filling stage, only brown spots are found on the grain.
The phenomenon of browning of husks mainly occurs in the middle and lower rice grains of the tassels. The apex of the granules of this part of the stalks is slightly open, and the inside is not normally grouted and firm; the granules of the rice husks at the top of the rice ears are green and can be normally grouted. There are no obvious brown spots on the damaged hulls caused by diseases such as grain mites and sclerotium. If the incidence of brown stalks in the field is high, and there is no obvious disease center, the occurrence of these diseases can be basically eliminated. possibility. In recent years, the amount of Laodelphax striatellus in Jiangsu Province is relatively small, and the damage to rice is relatively light. Generally, it does not cause browning and blackening of a large number of rice panicles in the field. This year, there is a continuous high temperature and high temperature in the rice jointing and booting stage in Jiangsu Province. The highest daily temperature exceeds 35 °C, and the highest temperature in some areas reaches 37 °C. It is easy to cause the differentiation and development of rice panicles to stop, and some spikelets can be seen white at one earing. Turn brown. Some degraded spikelets are still green after the ear is extracted, but their resistance to disease is weak and they are easily infected by some weak parasitic bacteria, which causes the hull to turn brown.
Due to the physiological factors such as glomerular dysplasia, the rice husk turns brown, and generally no measures need to be taken to remedy. Spraying high-quality foliar fertilizers such as potassium dihydrogen phosphate and octame-hydrogen trihydrate on the above-mentioned fields is conducive to promoting normal grain filling and reducing production loss to a certain extent.
More pesticide information, please pay attention to China Pesticide Network
(Source: Pesticide Newsletter)
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