Potato late blight is a devastating disease that can infect the leaves, petioles, stems and tubers of the potato. The leaves are infected on the tips of the leaves and on the leaf margins. They begin to have spots that are watery and rapidly expand when wet. There is a white sparse mold wheel on the edge, and the back of the leaves is more pronounced. In severe cases, the leaves wilted drooping, and finally the whole plant became charred, showing a wet rot. When dry, the lesions are brown and dry, and no mold wheel is produced. The potato squash formed light brown or gray-purple irregular lesions when it became sick, and fell slightly. The potato under the lesion showed brown necrosis with different depths. The diseased potato is susceptible to complications as a result of infection by other pathogens. It is often due to bacterial infection and soft rot. After the infection of the stem, the lesion can spread to the stem along the petioles, forming brown streaks on the cortex, and a white mold layer under humid conditions. In severe cases, the stem becomes brown and necrotic as other parts.
In response to the requirements of green agriculture, several opinions on how to screen for drugs for emergency prevention and control work are discussed:
1. Grasp the time and method of medication. After the emergence of the diseased plant in the field center, it should be immediately treated with medication and grasp the key points of the first application of the pesticide in the initial stage of the disease. Emphasize that spray thoroughly through, do not hesitate to take the water without hesitation.
2. Do a good job monitoring and forecasting. An epidemiological observation nursery is set up in the vulnerable areas each year. Before the season of local annual late blight, regular surveys were carried out in conjunction with large-scale censuses to closely monitor the onset of the disease, especially in the case of climatic conditions conducive to onset, and observations should be made daily. After the onset of the disease was discovered, the central diseased plant was immediately removed and buried in-situ. At the same time, chemical control was performed.
3. Do a good job of emergency control measures for pharmaceuticals. At present, fully-complexed mancozeb is a special agent for preventing and controlling potato late blight (including early blight), which is safe and has good control effect. It can be used as a rich (75% mancozeb water dispersible granules) 600-800. Double spray control. If there is a lot of rain, the speed of disease development is fast, and the system can be used for systemic bacteria sterilization (72% cream urea manganese zinc powder) 600 times, or gold (58% metalaxyl MnZn wettable powder) 500 ~ 600 times liquid, or use Sai Lu + into the rich half of the amount of conventional dosage spray control effect is better. It can also be controlled by spraying 68.75% silver silver (fluopyram-fencarb hydrochloride) 800-1000 times. The above medicaments are sprayed once every 7-10 days, and the number of sprayings is controlled depending on the occurrence of the disease, and the spraying is generally about 3 times. Attention should be paid to alternate drug use, alternative drug use, and scientific mixed drug use technologies to improve drug efficacy, reduce costs, and delay or inhibit disease resistance.
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