Bakanae disease is also known as long-term disease, which occurs in all rice areas in the country. The symptom is that the diseased grain often does not germinate or can not be excavated after sowing. Seedling disease seedlings were higher than the healthy seedlings, leaf sheaths were slender, yellowish leaves, poor root development, and some of the diseased seedlings died before transplanting.
Soaking is one of the effective ways to prevent bastard disease, but this year some farmers have reported that their own rice seeds were soaked, but why bastard disease still occurs in the field? The author analyzes the reasons as follows:
First, the operation is not standardized, there is no special soaking tank, soaking concentration is arbitrary, and some farmers even soaked in the flowing stream, or soaked together with the packaging bag, resulting in insufficient contact between the seed and the liquid. The effect is naturally poor.
The second reason is that the time for soaking seeds is insufficient. Generally, soaking is required for at least 4 hours, preferably 12 hours to 24 hours. Some farmers only sow within two or three hours or even less than half an hour.
Third, unqualified pesticides may be used, such as substandard pharmaceutical agents, or even counterfeit drugs, or they may be mistaken for seed soaking agents.
The fourth is the incidence of germination. Some farmers have high temperature when germinating, especially when transplanting seedlings, the temperature of the germination stage is high and the pathogens are easy to infest. Some dry nursery fields cover the film and cause higher seedbed temperature, which also facilitates pathogen infestation and disease conditions. development of.
Fifth, the same kind of seed soaking agent may be used for a long time, resulting in resistance, such as long-term use of prochloraz, can be used for 25% cyanocaverate suspension 2000 to 4000 times liquid, 16% evil thread wetting powder 500 to 700 times Liquid and so on.
At present, a small number of farmers attribute the occurrence of bastard disease to rice grains in the seeds, commonly known as “rice valleyâ€, which is the seeds without shells. This is a great misunderstanding of bastard disease. Without shell seeds, as long as the rice kernels are intact and the germs are not harmed, they can germinate normally and develop into normal and robust plants, which have nothing to do with bastard disease. The hybrid seed itself has the physiological characteristics that the glume is not tightly closed, and the mechanical action in the threshing process causes the glume to fall off and form the “rice valleyâ€. In general, there are some hybrid rice seeds with “Miyaguâ€, but it is not a matter of seed quality, and it is not related to bastard disease.
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