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(b) Control methods.
1. It is advisable to implement 2-3 year rotation with onions, garlic or cabbage vegetables and grass crops.
2, strengthen the cultivation and management. High-ridge cultivation or narrow-narrow ravine cultivation shall be carried out; water shall be removed in a timely manner to remove waterlogging, reduce the humidity and groundwater level in the field, and promote the development of the root system; remove the diseased plant debris and reduce the bacteria source in time.
3, the implementation of chemical control. The medication started when there was a sporadic illness in the field. The application method is to irrigate or sprinkling the base of the stem, once in 7-10 days, and 3-4 times for continuous administration. Irrigate each time 250 ml of liquid per strain. Pharmaceutics are: 70% thiophanate-methyl wettable powder 1000 times, 50% carbendazim wettable powder 400 times, 75% chlorothalonil wettable powder 600 times, 70% dexamethasone powder 1500 times, 20% Ammonia Bronze Aqueous Solution 400 times.
Second, rust (a) identification. The main damage leaves, petioles, stems and pods can also be victimized. At the beginning of the disease, yellow and white spots were formed on the back of the leaves, and they slightly raised and formed a reddish-brown freckle after enlargement. They had yellow halos. After the freckle ruptured, reddish-brown powder was scattered, and the leaves at the spots were in front, resulting in chlorotic spots. At the late stage of plant growth, the diseased part produces black freckle and contains black powder.
(B) Control methods
1. Select resistant varieties and implement rotation cultivation.
2, strengthen the cultivation and management. Adjust the sowing date so that the harvest season avoids the rainy season, drains the ditch, prevents damage, and cleans the countryside after harvest.
3, the implementation of chemical control. In the early stage of disease, 25% triadimefon was sprayed in 2000 times. 15 days or so spray protection 1, even spray 2-3 times, or with 50% rust rust EC 800 times, 50% carbendazim WP 500 times spray, 7-10 days 1, even spray 2-3 times.
Third, the identification of coal mildew (a). The main damage leaves, vines and pods can also suffer. Initially, purple spots were produced on both sides of the leaves, and they later expanded into light brown and near-circular lesions. The surface had dense layers of coal-like mold and the backs of leaves were more than the front. In severe cases, the diseased leaves are dry and fall early. The last plant leaves only a few young leaves at the top.
(B) Control methods
1. Strengthen cultivation and management, ensure close planting, ensure good conditions for ventilation and light transmission in the field, and rational fertilization, pay attention to the application of organic fertilizers, increase the application of phosphorus and potassium fertilizers and trace fertilizers, increase the resistance to disease, remove diseased leaves in time, and reduce the amount of bacteria .
2, timely application of pesticide control, spraying pesticide control at the beginning of the disease. About 10 days, spray 2-3 times. The agent can be used 70% thiophanate-methyl wettable powder 1000 times, 75% chlorothalonil wettable powder 600 times, 40% chlorhexidine suspension 800 times, 40% dry WP 1000 times liquid.
The main disease prevention technology of cowpea
First, root rot (a) identification. The red and brown lesions began to appear on the main roots and underground stems of the plants. The edges were not obvious. They gradually turned dark brown to dark brown, slightly sunken or cracked. After flowering and scabbing, the leaves gradually turn yellow and wither from the bottom upwards, and generally the leaves do not fall off. The main root of the diseased plant was rotted after being damaged, no lateral roots were produced, the plants were short, and severe stems and leaves withered and died.