Common disease chart of cherry tomatoes, with common control methods

SummaryLate blight: spray chlorothalonil, Bordeaux mixture, mancozeb water-dispersible granules, and dimethomorph-mancozeb wettable powder for control. Leaf mold: spray chlorothalonil for control. Yellow-white seedlings: apply more iron fertilizer, less phosphorus fertilizer and zinc fertilizer. Fruit cracking: water timely when moisture is low, and drain timely when there is heavy rain. Tea yellow mite: spray propargite emulsifiable concentrate or hexythiazox emulsifiable concentrate for control.

I. Late blight

1. Late blight of cherry tomatoes is divided into early blight and late blight. Early blight is very harmful to the growth of the whole plant. In the early stage of the disease, brown spots mainly appear on the leaf surface along white lines, and then gradually spread to the stems and fruits. The cause of this disease is prolonged high temperature and rain, which leads to the production of pathogens and then infects the cherry tomato plants.

2. During this period, the seeds can be scalded before sowing, which can enhance the resistance of the plants. The second method is to use chlorothalonil or Bordeaux mixture for control. Late blight is caused by low temperature and high humidity. The symptoms of the disease are similar to those of early blight, except that white mold appears in the later stage. It is generally controlled with mancozeb water-dispersible granules or dimethomorph-mancozeb wettable powder.

II. Leaf mold

1. Leaf mold is mainly related to seasonal changes. That is to say, based on normal rainfall at ordinary times, leaf mold generally does not occur. If seasonal changes cause a sharp increase in rainfall, and rain continues, it will lead to excessive soil moisture that cannot all be drained away.

2. At this time, yellow spots will appear on the leaf surface and gradually spread to the stems and fruits, and then a layer of brown mold will appear. Generally, humidity can be reduced by enhancing field ventilation, and the diseased branches should be removed, then chlorothalonil should be sprayed for control.

III. Yellow-white seedlings

1. If cherry tomatoes show symptoms of yellow-white seedlings, then it is related to the soil. The symptoms of yellow-white seedlings in cherry tomatoes are that the leaf surface changes from green to yellow-white. Normal cherry tomatoes are bright red when mature, while diseased cherry tomatoes are orange-yellow in color.

2. Generally, when planting, it is necessary to do a soil test to see whether the pH value in the soil is relatively balanced. At the same time, apply more iron fertilizer and less phosphorus fertilizer and zinc fertilizer to supplement the calcium content in the soil.

IV. Fruit cracking

1. The phenomenon of fruit cracking in cherry tomatoes is relatively common, generally occurring when the cherry tomatoes are coloring. If the fruit cracking is severe, it will lead to a serious decline in yield. The cause of cherry tomato fruit cracking is uneven light or moisture, so attention should be paid to adjusting light at ordinary times, and strong light should be avoided as much as possible.

2. Water timely when moisture is low, and drain timely when there is heavy rain, which is helpful for maintaining the balance of field moisture. This can effectively prevent fruit cracking. In the early stage, varieties with strong resistance should also be selected for planting.

V. Tea yellow mite

1. Tea yellow mite is a common pest. It not only harms the stems and leaves of cherry tomato seedlings, but in severe cases also harms the fruits of cherry tomatoes. A layer of brown, insect-like marks can be seen on the fruit surface, affecting the quality and yield of cherry tomatoes.

2. Tea yellow mite can only be controlled with chemicals. Generally, propargite emulsifiable concentrate or hexythiazox emulsifiable concentrate can be used for spraying control, once every about 7 days, and 2-3 consecutive sprays can eliminate it.