Pre-medication and prevention of good leaf mites can effectively alleviate the occurrence of late panicle
Q: Ye Hao has climbed to the top of the flag leaf. I used tricyclic azole every 1 month in the rice breach period on August 30 and the heading stage on September 5th. Is it necessary to take medication again? Will it induce spikes in the late stage?
A: The rice blast fungus mainly overwinters on mycelium and diseased valleys with mycelium and conidia, which became the first source of infection in the following year. Seedlings can cause nursery after sowing. In the next year, when the temperature rises to about 20 °C in the next year, the conidia can be continuously produced by the rain, and the conidia spread to the rice leaves by airflow, rain, insects, etc., at a suitable temperature and humidity. Germination under conditions and direct invasion of the epidermis triggers leaf axils. The spores formed on the leaves, especially the inverted two-leaf and the inverted trifoliate lesions, are the main source of the sputum. In the early stage, the leaf stalks were severely affected, and the source of the bacteria in the field was sufficient. In the rainy days during the heading and flowering period, the weather conditions of the rainy days would be re-issued. Pre-medication and prevention of good leaf mites can effectively alleviate the occurrence of late panicle blast.
Rice panicle neck is most susceptible to rice blast at the beginning of the earing stage. This is because the leaf sheath is loose after the beginning of rice, which is a convenient door for the invasion of rice blast. At the same time, when the cob is just elongated, the neck of the ear is relatively young. In the weakest part of the rice plant, the pathogen is easy to invade; after 6 days of heading, the ear and neck tissue gradually grows stronger, the disease resistance is enhanced, and the pathogen is not easily invaded and causes the disease. Prevention and control of rice panicle neck lice should be mastered in the early stage of rice blasting (see 5% to 10% of ear), and the effect of premature or late treatment is poor. If the variety is susceptible to illness or the continuous rainy weather during the heading and flowering period, it should be reused once in the heading stage. The two doses are usually separated by 5 to 7 days to consolidate the control effect.
Tricyclazole is a highly effective drug for the control of rice blast, but it has only protective effects and no therapeutic effect. It is advisable to spray and protect healthy plants before or at the onset of rice blast. The drug has strong systemic properties. After application, the drug can be quickly absorbed by various parts of rice. The mechanism of action is mainly to inhibit the formation of attached melanin, thereby inhibiting spore germination and sporulation, preventing pathogen invasion and reducing spore production. The period of validity is 7 to 10 days. In the early stage of rice blasting, the drug is administered in a sufficient amount to have a good preventive effect on the panicle. It is not advisable to use the drug alone to control rice blast in the rice heading stage. It is advisable to add a therapeutic effect drug such as chunremycin, pyraclostrobin, rice amide, rice glutinous rice, and prochloraz to consolidate the panicle Control effect.
From the picture, the rice tassels have been extracted, and the flowering is basically over. Only a few spikelets in the lower part of the tassel are still flowering, and there are a few rice blast lesions on the flag leaf. If it is controlled once with tricyclazole in the early stage of rice heading and at the heading stage, and there are not many rainy days in the heading and flowering stage, it should have a good preventive effect on the ear neck. If the rice is over-flowering and rainy days, or the variety is susceptible to disease, it is advisable to add a therapeutic effect to the rice at the heading stage, such as chloramphenicol, pyraclostrobin, rice amide, rice glutinous rice, and prochloraz. Otherwise spikes may occur. The incidence of rice blast fungus infection is low after rice flowering, but considering the rice blast disease on rice flag leaves, and only used tricyclazole protection in the early stage, no therapeutic drugs are used, it is best to use therapeutic effect in the near future. The drug controls the leaf axils to extend the functional period of the upper 3 functional leaves.
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(Source: Pesticide Newsletter)
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