Control measures of eggplant Verticillium wilt

The incidence of eggplant Verticillium wilt in general years is 40-50%. In severe years, the incidence rate was more than 70%, and even the harvest was unacceptable. The farmers' vegetable garden was even more serious. Prevention of verticillium wilt disease is a guarantee of good eggplant harvest.

First, the symptoms of disease. Eggplant verticillium wilt disease mostly occurs after the fruit is set in the eggplant, and the diseased plant grows sharply in the fruit period. At the early stage of disease, the middle and lower leaves of the plant chlorosis or chlorosis on the middle and lower leaves, and gradually develop upwards, so that half of the branches and leaves become yellow and dead, and the fruit is not rigid. Therefore, it is also called half crazy. In severe cases, the whole plant withered and the leaves dried off and became light rods. Peeling the roots and stems of the cortex reveals that the vascular bundle has turned brown and is also known as black heart disease.

Second, the incidence conditions. The severity of eggplant Verticillium wilt is closely related to the etiological factors, climatic factors and cultivation factors.

1. Source factors: Eggplant verticillium wilt disease is a soil-borne disease, soil bacteria is the main source of bacteria. Verticillium dahliae with mycelium, chlamydospore and pseudosclerotia are living in soil with diseased residues, and generally can survive for 6-8 years. The pathogens mainly invade from root wounds and can also invade from the radicle and root hairs and propagate in the vascular bundles of plants. Therefore, heavy pods or neighboring cultivation, the soil contains more bacteria, the incidence of heavy. In particular, the small vegetable gardens in front of and behind the houses are basically cultivated and planted in neighboring areas, so the diseases are even heavier.

2. Climatic factors: Temperature is an important factor affecting the occurrence of diseases. Low temperature is the main factor of disease, and the general temperature of 20-25°C is conducive to disease. From the time of eggplant planting to flowering, the more days the daily average temperature is lower than 15°C, the earlier the disease becomes heavier. The temperature is above 28°C and the disease is suppressed.

3. Cultivation factors: soil viscous weight, saline-alkali soil, heavy crops neighboring, partial nitrogen fertilizer, raw manure, rooting, planting too thin, seedlings in the midday sun, soil cracking and other diseases are heavy. In particular, watering on a cold day can easily cause an outbreak of Verticillium wilt.

Third, prevention and control technology. Verticillium wilt has strong viability, rapid spread, great harm and difficulty in prevention and control. To adhere to the selection of disease-resistant varieties as the basis, to strengthen the cultivation and management as the center, with comprehensive prevention and control measures to ensure the prevention and treatment of drugs, can effectively control Verticillium wilt disease.

1. Selection of disease-resistant varieties: where the leaves are oblong or pointed, leaf edges are notched, leaf-faced hairy, dark green or purple leaf color varieties are more resistant than disease, such as Guozhuang Changjiang.

2. Cultivation measures prevention and control: (1) Rotation and dumping. The five-year rotation of the Solanaceae crop is best not to be adjacent to the Solanaceae crop. Chopped eggplant and daejeon planted eggplant. (2) Scientific fertilization. Mushi rot 3-4 cubic meters of agricultural fertilizer, 15-20 kilograms of diammonium phosphate, 10 kilograms of urea, potash 10-15 kilograms, avoid partial nitrogen fertilizer, avoid application of raw manure, so as not to burn roots. (3) Proper close planting. The planting of the densely planted plants was early ridged and the roots were reduced. The planting density is 6030 cm. (4) Improve the quality of colonization. When eggplant is planted, it is necessary to adhere to the “Four Noes”: in the 10 cm ground temperature stable at 15 °C or more, choose sunny and warm weather to plant, do not colonize as early as possible; use nutrition to protect the seedlings, so that the planting does not hurt the root; As well. No seedlings will be planted under the hot sun at midday. It is advisable to plant seedlings to bury the soil. Not too deep. When planting seedlings must be covered with plastic film, it is best to add a small arch shed, so that double film coverage. (5) Carefully managing water and fertilizer. The ground temperature of eggplant is low in the early stage of growth, and watering should be as low as possible. When watering is needed, water should be selected for sunny and warm weather to prevent cold and cloudy weather from watering, so as to avoid the outbreak of verticillium wilt. From mid-July to mid-September, during the high temperature season, small water is poured to keep the ground moist, so that the soil is not cracked, the roots are reduced, and the disease is controlled. During the budding period of the door, the use of Qiongsu 10g + gibberellin 0.25g + boron fertilizer 100g + urea 50g plus 15kg of water, sprayed once in 10 days, until the flowering stops, the fruit and fruit can be doubled To enhance resistance to disease.

Third, chemical control. Prescriptions for prevention and cure: (1) Qiongsu 10 grams + 5 grams of bactericidal killing agent, 15 kilograms of water, and watering the base of the stem before onset or at the beginning of the disease, 150-200 grams per strain, 5-7 days irrigation 1 time, even irrigation 2 times. (2) Chinonin 10 grams + 25 grams of copper sulfate, 15 kilograms of water spray wet the whole plant. Use one of the above mixture to irrigate or spray at the early stage of disease, and spray once every 5-7 days for 2-3 consecutive times. General medication 2-3 days to control the condition, 5-6 days of the disease quickly recovered. If insecticides are added to the above mixture, the effect is better. At the same time, prevention and treatment of diseases such as brown-spot disease and M. blight.

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