Tomato sesame spot disease

Inquiries: I am a farmer in Liangzhou District. I have seen a lot of small black spots on the bottom leaves of the tomatoes growing in the greenhouse. The back of the leaves is particularly noticeable. The middle of the lesions is slightly sunken and there is milk-like liquid when it is wet. What is the disease? I have no effect with streptomycin in agriculture. What should I do?

Answer: According to the description, it should be tomato's sesame leaf spot, which is a fungal disease. The germs winter in the soil. Continuous rainfall occurs when the temperature inside the greenhouse is 25 to 28°C and the humidity is high. First, it occurs from the bottom lobe. The lesions are black and 1 to 10 mm in size. They are generally round and sometimes long. When wet, black mold is present. In addition, this pathogen can also infect the pedicel, and it also shows a lot of dark spots on the stem.

Recently, there have been several consecutive cooling and precipitation events in the Hexi region, which caused high humidity in the greenhouse. The bacteria first splashed from the soil to the old leaves on the bottom and invaded through stomata, and then gradually expanded. This disease can be controlled by the use of ammonia, copper, and fungi that prevent and control common fungi. But it should be noted that the first bacteria invade the bottom of the leaf, and more in the back of the leaves, so in addition to spraying the whole plant spraying, should focus on spraying the bottom of the bottom leaves and leaves in order to achieve better results.

The peasant friend said that white mucus appeared on the back of the leaf when it was wet. This should be the bacterial infection from the lesion on the back of the leaf. Therefore, the effect of spraying only streptomycin is not good, and after the spraying of the above-mentioned pesticides, the agricultural streptomycin can be sprayed and the effect will be very good.

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