Life is a dream on August 26 WeChat: I'm Luji Town in Youyang County. Rice rice smut has occurred. What special drugs can prevent it?
It is understood that the above-mentioned rice began to break before and after the August 10th, and that the ear of rice was already on the 26th for 1 week and began to show the symptoms of rice smut, with 6 to 7 grains of rice smut disease in each disease ear. Spike rate of 15%. 3 to 4 days before the rice break, 20 grams of 30% benzoylzinc per acre was used to control rice smut. He heard that 45% Prochloraz 50% and 25% Pyraclostrobin 20g/mu were used to control the rice that had already developed rice smut disease.
Sphaerotheca fuliginea isolates sclerotium and chlamydospores on soils, rice seeds and other substrates or hosts, and germinates as the initial infestation source under the appropriate conditions of temperature and humidity the following year, infecting rice to cause diseases. The booting stage of rice is a susceptible period, and the period from the end of booting to the period of breaking is the main infestation stage of rice blast. 9 to 12 days after the rice breaks, the onset period begins, and the onset of the disease is characterized by the first acute and then slowed down. In the early stage, there is a peak of incidence, which generally harms individual grains on the ear of rice.
The rainy weather during the flowering stage of rice heading was beneficial to the occurrence of rice smut. According to weather information, there were four rainfall processes in the middle and late August in Fuyang and other places, including August 7-8 and 12-13 before and after rice heading. The low temperature and rainy weather during the heading stage of rice breaks are conducive to the occurrence of rice smut.
To prevent the occurrence of rice smut, the key must be based on the law of occurrence of the disease, 5 to 7 days before the rice break medication, premature or late treatment efficacy will decline. Production can generally be controlled in the rice leaf pillow level (the flag leaf leaf pillow and the second leaf leaf pillow leveling) or in the leaf pillow level back 2 to 3 days after the drug. It is also possible to use all the flag leaves of one-third of the whole field as the application time, which is about 7 days from the heading of rice. When the rice is used 3 to 4 days before the break, the time is delayed and the control effect on rice smut is reduced.
Benzocilazole is an effective drug species for the prevention and treatment of false smut, generally 6 to 7.5 grams per mu. Weather conditions are conducive to the occurrence of diseases, in order to ensure control efficiency, generally should be about 9 grams of pure medicine per acre. According to reports, 30 ml of 30% dimethiconazole EC was used 7 days before the rice break and at the heading stage, and the control effects on the panicle ear disease rate and the disease rate were 73.25% and 73.79%, respectively. 30 grams of 30% benzoylzinc per acre has good preventive effect on rice smut. If the rice rains before and after heading, it is best to increase the dose per acre to 30 grams.
There was no effective drug treatment after rice smut occurred. Pyraclostrobin and prochloraz are broad-spectrum bactericides, but they have no therapeutic effect even after rice smut occurs.
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