Rice blast is one of the main diseases in rice production in Hongta District, which may occur throughout the growing period of rice. The main symptom of the disease is fusiform lesions. According to the different periods of occurrence, it is divided into nursery disease, leaf blast, thrift disease, panicle neck lice and grain mites. Commonly known are leaf blast and ear-necked ticks, of which the damage from the ear-necked scorpion is the greatest. It is most susceptible to disease during the tillering stage of rice and from the end of the booting stage to the heading stage. At the end of the rice to the heading stage, when the temperature is 20-30 ° C, especially at 24-28 ° C, the relative humidity is above 90%, and then the rainy and continuous climate, if planted rice varieties (such as Chujing 27) ) The resistance is poor, and it is prone to panicle neck lice and even prevalence.
The control measures are as follows:
1. Prevention and control of spider mites in the field of Daejeon. When leaf mites occur, they should be sprayed with “Taojieâ€, “Tricyclazole†and other pharmaceuticals in a timely manner to “pick and cure†the central disease group.
2, the prevention of panicle neck sputum application from the end of the booting to the beginning of the heading. The ear-necked pheasant has the characteristics of “destroying disease, not seeing disease, and being incurable.†It is very devastating. Therefore, the prevention of panicle-neck is very important and cannot be ignored. Specific control measures: the first application of rice when the rice heading is about 5% (the field where the leaf axillary occurred in the early stage, the common disease area is applied again at the heading stage), and the “Taojie†60 grams of water is used for 60 acres. A kilogram of conventional spray or 75% of "tricyclazole" 45 grams of water and 60 kg of water are used alternately.
3, the application of pesticides should be in place, avoid standing on the field and apply the medicine freely. When applying the medicine, the liquid should form a mist, so that the medicine is evenly distributed and the prevention effect is good.
4. Within one hour after application, if it is raining, it should be applied once.
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