Recently, Tianchang City bid farewell to high temperatures, the temperature is mostly at 20-30 ° C, more rainy weather, the field humidity is large. At this time, rice has entered the heading stage, and it has encountered such a moderate temperature and high humidity. This stage of rice is likely to cause the occurrence of panicle neck, rice smut, and sheath blight. In particular, due to the influence of the No. 13 strong typhoon “Sudiroâ€, the number of pests in the rice leaf roller and rice planthopper has increased. Therefore, it is necessary to master the rational application of pests and diseases in the key period to ensure the high yield of rice.
Prevention and control of the ear and neck should be carried out twice in the application period, especially in the rainy weather before and after the heading period, the first time in the beginning of the breach, that is, the field can be seen sporadically out of the rice leaf When the leaf sheath is used, it is commonly used as the "chaos out of the ear"; the second time in the heading stage, that is, when 80% of the rice ears of the whole field extend out of the flag leaf sheath. Applicable agents include rice bran, tricyclazole, and serotonin. The rice blast pathogen is not resistant to tricyclazole, but the drug has only a preventive effect, and there is no therapeutic effect after the onset of the disease, but it can be used at the early stage of the disease to protect the uninfected strain. The drugs such as Indigo and Chunleimycin have preventive and therapeutic effects. They can be used after the onset of the disease, but the rice blast fungus is easy to be resistant to the drugs such as Indigo, and it should be used in combination with other drugs.
In the prevention and treatment of rice false smut, it is necessary to pay attention to the appropriate use of drugs, generally two times. The first time is 5-7 days before the break, this is the peak of the initial infection of the bacteria, and the last leaf of the stem of more than one third of the whole field is extracted, which is commonly used as the "drumstick". . The second prevention and treatment was carried out at the beginning of the break. If the medium-temperature and high-humidity weather at the heading stage is particularly suitable for the occurrence of rice false smut, it is recommended to prevent it once again at the heading stage on the basis of two prevention and control. Applicable drugs include Jinggangmycin, Prochloraz, and azole bactericides such as hexaconazole and tebuconazole, which can effectively prevent sheath blight. The prevention and treatment of rice false smut can be combined with the two medications of the ear-neck sputum for comprehensive prevention and treatment.
In the beginning and early stage of rice blasting, it can be combined with the prevention and control of rice main ear disease diseases, and the control of rice leaf roller, aphids and rice planthoppers. For the control of rice leaf roller and aphid, avermectin, emamectin benzoate, fipronil, chlorantraniliprole and the like can be used. For the control of rice planthopper, pymetrozine, thiamethoxam, nitenpyram, chlorpyrifos, isoprocarb and the like can be used.
Regardless of which pests and diseases are controlled, spraying should avoid the flowering period of rice. It is advisable to spray before 8 o'clock in the morning or after 4 o'clock in the afternoon to avoid affecting rice pollination. If the medication is suitable for continuous rainy weather, it is advisable to spray before the rain or catch the rain stop to apply the medicine. Do not miss the application period to ensure the control effect.
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