In the process of planting tomatoes, many farmers may encounter such a problem, that is, the leaves on the leaves are always long spots. This makes the vegetable farmer's friend a headache. What can I do? Let's go to see the long spots on the leaves of the tomatoes along with the farmer Kobayashi.
First, the symptoms
Due to the preference of tomato prices in the first half of the year, many vegetable farmers changed their tomatoes in the mouth of the second half of this year. Recently, as tomatoes entered the flowering and fruiting period, many vegetable farmers’ sheds had many problems, including “spots†on the leaves. Constantly.
From the picture of the disease sent by the vegetable growers, the leaf spots of the tomato are mainly concentrated in three aspects: one is the flash leaf caused by improper wind release under high temperature conditions, which is white dry, no disease sign, limited by veins; the second is improper use of the drug. The burning is dark brown, the middle color is slightly shallower and the circumference is deeper. The third is the spot caused by bacterial diseases. It is small and dense. The bottom leaves are densely colored with black needle-shaped dense dots and perforated at the top. The yellow spots around it.
Therefore, in management, it is necessary to carefully identify and prevent the symptoms caused by different factors.
Second, how to prevent long spots of tomato leaves
1. For the flashing light caused by excessive light or improper wind blowing at high temperature
It occurs mostly at the near-air outlet, which is caused by insufficient dry moisture or temperature changes and insufficient resistance to leaf tissue. This is a physiological problem and is not contagious. Therefore, in the management, we should continue to block the glare and avoid the shed temperature being too high. Generally, it can cover 3-4 hours of sunshade at noon. The functional leaf fertilizer such as seaweed essence and amino acid can be sprayed on the foliar surface and applied together with calcium fertilizer.
2. For the phytotoxicity caused by the high concentration of the drug used
It is recommended that you do not mix all fungicides, insecticides, foliar fertilizers, etc. when spraying. There are up to two different types of products when spraying, such as blending fungicides with leaf fertilizers, or blending insecticides with leaf fertilizers. The maximum number of mixed products is no more than four. Immediately after the occurrence of phytotoxicity, spray water, and add appropriate amount of products such as brassinolide and amino acid to alleviate the phytotoxicity.
3, in the high temperature and high humidity or the temperature difference between day and night temperature condensation, the bacterial disease occurs frequently, mostly with bacterial rash and ulcer.
The main occurrences are mostly in the areas where the growth of the snack leaves, the middle and lower parts of the old leaves, and the like, which are conducive to the accumulation of moisture. Therefore, it is recommended to strengthen the ventilation and dehumidification after watering, and spray the antibacterial agents once every 5-7 days, such as chunleimycin, neutrophin, quinoline copper, thiazole zinc, thiabendazole and so on.
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[Package Dimension] 36 round pieces
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[How To Use a Patch]
Please follow the Schematic Diagram. One piece, one time.
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[Attention]
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