Map of common diseases of virgin fruit, with common control methods

Blight: spraying chlorothalonil, Bordeaux solvent, mancozeb water dispersible granule and enoyl manganese zinc wettable powder for prevention and control. Leaf mildew: spray chlorothalonil for prevention and control. Huang Bai Miao: apply more iron fertilizer and less phosphate fertilizer and zinc fertilizer. Fruit cracking disease: timely watering when there is less water, and timely drainage when there is more rainfall. Tea yellow mite: spray propargite EC or Nisolang EC for control.

I. epidemic disease

1. The blight of virgin fruit can be divided into early blight and late blight. Early blight does great harm to the growth of the whole plant. In the early stage of the disease, brown spots appear on the leaves of the white line, and then gradually spread to the stem and fruit. The cause of this disease is a long period of high temperature and rain, resulting in bacteria, and then infected to the virgin fruit plant.

2. During the period, scalding seeds can be carried out before sowing, which can enhance the resistance of plants, followed by the use of chlorothalonil or Bordeaux solvent for control, while late blight is caused by low temperature and high humidity, and the symptoms of late blight are similar to those of early blight, except that white mildew will appear in the later stage, which is generally controlled by mancozeb water dispersible granule or enoyl manganese zinc wettable powder.

Leaf mildew

1. Leaf mildew is mainly related to seasonal changes, that is to say, according to the normal rainfall, leaf mildew generally does not occur. If it is a seasonal change, the rainfall increases sharply, and Liang Xu rains, it will lead to too much soil moisture. I can't drain it all.

2. At this time, yellow spots will appear on the leaves, which gradually spread to the stems and fruits, and then a layer of brown mold will appear. Generally, the humidity can be reduced by strengthening the permeability of the field, and the diseased branches can be removed at the same time. Then spray chlorothalonil for control.

3. Huang Bai Miao

1. If the virgin fruit shows the symptoms of yellow and white seedlings, it is related to the soil quality. the symptoms of the yellow and white seedlings of the virgin fruit show that the leaves change from green to yellowish white, the normal virgin fruit is bright red after ripening, and the color of the sick virgin fruit is orange.

2. Generally, when planting, we need to do a good land test to see whether the PH value in the soil is relatively balanced, and at the same time, we should apply more iron fertilizer, less phosphate fertilizer and zinc fertilizer to supplement the calcium content in the soil.

Fourth, fruit cracking disease

1. The phenomenon of virgin fruit cracking is relatively common, which generally occurs when the virgin fruit is colored. If the virgin fruit is seriously cracked, it will lead to a serious decline in yield. The reason for the fruit cracking is uneven light or moisture. Therefore, in normal times, we need to pay attention to the regulation of light and avoid strong light as far as possible.

2. Watering in time when there is less moisture, and timely drainage when there is more rainfall, which is conducive to maintaining the balance of water in the field, which can effectively prevent fruit cracking, and varieties with strong resistance should be selected for planting in the early stage.

Fifth, tea yellow mite

1. Tea yellow mite is a common pest, which not only harms the stems and leaves of virgin fruit seedlings, but also harms the fruit of virgin fruit when it is serious. A layer of brown, insect-like traces can be seen on the surface of the fruit, affecting the quality and yield of virgin fruit.

2. Tea yellow mites can only be controlled by insecticides, which can be controlled by spraying propargite EC or Nisolang EC every 7 days or so, and can be eliminated by continuous spraying for 2-3 times.