Tomato leaf mold is one of the major diseases of tomato. It mainly affects the leaves and also affects the fruit. It usually starts from the lower leaves and gradually expands toward the upper leaves. In the early stage of the disease, irregular yellowish chlorotic spots appeared on the front surface of the leaves, and the white spots on the back surface of the leaves grew to be white mold layers, which turned into brownish-brown or dark brown velvety fungus layers. Under the condition of high temperature and high humidity, the front surface of the leaves could also be Grow black mold. As the disease develops, the leaf curls back and the plant grows with the symptoms of leaf curling. The fruit is infected and round black lesions are formed near the fruit pedicle. The sclerosis is slightly depressed and cannot be eaten.

Tomato leaf mold disease pathogen Mycelium in the body of the disease or conidia attached to the epidermis of the seeds in the winter, conidia in the following year to become the initial infestation. After the onset of the field, a large number of conidia can be produced. With the help of airflow, the foliage can germinate under conditions of water and moisture. The optimum temperature for germ development is 20-25°C, the highest 34°C, and the lowest 9°C. The temperature is 22°C and the relative humidity is higher than 90%. The incubation period is generally about 14 days. Under conditions of lush vegetation and watering, it is easy to spread; in the protected areas, if there is a lot of humidity and long duration in a cloudy or shed, the disease will become popular. Prevention technology is as follows:

1. Use disease-free seeds and implement rotation for more than 3 years. Apply base fertilizer, formula use chemical fertilizer, try to increase biological bacterial fertilizer to improve soil permeability and root absorption capacity.

2. Strengthen the control of temperature and humidity, the temperature is controlled below 28 °C, humidity below 75%. Appropriate ventilation, enhanced lighting, timely pruning.

3. Before the planting, the protection facilities were fumigated; in every 550 cubic meters of space, 2.3 kg of sulfur powder and 4.5 kg of sawdust were mixed, and several points were placed in the shed to ignite the closed fumigation. Sulfur powder can also be used 2 kg plus dichlorvos 0.5 kg, sawdust 4.5 kg mixed points, ignited closed fumigation. Chlorothalon fumes were used during the growth period, 250 grams per mu, divided into multiple points to ignite closed fumigation. It usually takes place in the evening, and the next day, it is released in a timely manner.

4. Chemical control can be controlled by spraying 1500 times solution of world high water dispersible granules or 600 times that of 50% Rimulon WP or 40% Fuxing 4,000 to 6,000 times. Note alternate medication.

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