Eggplant is the main vegetable planting species in our county. It is planted all year round, and its annual cultivation area is above 600hm2, accounting for about 5% of the county's vegetable area. Eggplant Mushroom disease is one of the most important diseases on eggplant, Shanghang County, Fujian Province. From the middle of April to the end of September, the onset of disease occurs until the end of September. During the period, there are two peaks (May to mid-June, late August to mid-September). The weight of the second peak is mainly determined by the duration of the typhoon. And thunder rain weather. In recent years, due to climate and other reasons, the occurrence of the M.infestation is more serious, which has caused huge economic losses to the vegetable farmers in our county. The following is a brief summary of the causes of the occurrence of Mushroom disease:

1. Continuous cropping for many years, with many sources of residual bacteria in the field, providing a source of bacteria for the occurrence of M.I.

The towns of Lincheng, Gutian, and Yeyang in Shanghang County are the main vegetable production areas in the county. The area of ​​growing vegetables over the years is large, and the multiple cropping index is high. Many vegetable growers continue to make eggplants, tomatoes, peppers, and potatoes together or as neighbors. The bacteria source is sufficient, and the accumulation of field bacteria sources provides the bacteria source guarantee for the occurrence of diseases.

2. Loss of resistance to main cultivars, late planting, coincided with the rainy season, laid the foundation for the occurrence of M. blight

According to the survey, many vegetable growers in our county selected high-yield, early ripening, slender, and purple-colored “Qiangqie No. 1” and “Qiangqie II” as the main cultivars. An important reason for the great development occurred; some farmers planted seeds from late December to January. The result of the harvest was just in the April-May rainy season, which also provided conditions for the occurrence of the disease.

3. Proper climatic conditions are the primary cause of major epidemics

The proper temperature and high humidity in Shanghang County in April and April last year provided guarantees for the occurrence of M.infestation. According to the analysis of the County Meteorological Bureau, from April to May, the amount of rainfall is heavy, the monthly rainy day reaches 85%, the relative humidity is over 95%, and the monthly average temperature is 23-25°C. In this kind of moderate temperature, light, rain, and humidity Under the climatic conditions, it is conducive to the infection and reproduction of germs, creating the necessary conditions for the occurrence of M.bambicata, which has become the primary cause of the occurrence of M.squamata disease in our county.

4. Cultivated management is extensive, planting is too dense, and the drainage of planting fields is not open, aggravating the occurrence of M. blight

Due to historical reasons, vegetable farmers tend to leave residues, dead branches and fallen leaves in the corners of vegetable gardens after they are harvested. Many vegetable farmers randomly throw the diseased eggplants left in fields, lands, and gutters, and extensively cultivate and manage them as germs. Communication has created favorable conditions; some farmers have planted dense plants with 1,800-2, 000 plants per acre, poor ventilation in the field, unreasonable release of wind from protected areas, and excessive humidity; some low-lying drainage is not open or the soil is heavy, which is aggravated. Occurrence of M. blight.

5. There is no symptomatic remedy, and the prevention and treatment of the disease caused by the lack of timely treatment also increased the incidence of M. blight.

No pesticides were selected, and some farmers chose “5% Jinggangmycin Aqueous Solution + 50% Ledomil WP”, “50% Carbendazim Wettable Powder + 20% PFAFF Wettable Powder”, etc. The use of inappropriate roads has caused a decline in control effectiveness. Some farmers have missed the appropriate control period due to rain, which has aggravated the occurrence of M. blight disease.

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