Causes and prevention methods of tomato early blight
Tomato early blight is one of the most common diseases. The earliest damage to the leaves is the leaves, followed by the branches and fruits. The symptoms of the disease are a circle of threads. Therefore, there is a disease called ring rot, which has a great influence on tomatoes. Seriously affect its quality and output, then what is the cause of the disease? How to prevent it? Let's take a look at it.
First, the cause of tomato early blight
Early blight often occurs between late May and early June when the air temperature is arrogant and humid. It is a fungal pathogen that spreads through air, wind, rain, etc., in addition to other healthy tomatoes, it also infects crops such as eggplant, pepper, and potatoes. In addition to the damage to tomato leaves, stems and fruits, it will fall into the soil with the air, rain and wind, and it will be difficult to control.
Second, the prevention and treatment of tomato early blight
1, variety selection
Early blight usually occurs in tomato varieties with large and large leaves, so it is possible to choose early-maturing and narrow-leaf varieties with mild onset of early blight. Because the pathogens of early blight can lurk in the seeds, when selecting seeds, choose tomatoes that are not infected with premature plague. Tomato seeds can be soaked in warm water of about 50 degrees to kill early blight before planting.
2, pay attention to rotation
The pathogen of early blight has more than one year of incubation period, and the solanaceous crops such as pepper, eggplant and potato are also infected with early blight, so it is best to carry out reasonable rotation with non-solanaceae crops for 2 years to 3 years to reduce early blight. The occurrence may be.
3, prevention and treatment
It is necessary to start the prevention and treatment of the drug when the tomato seedlings are fixed. Before the planting, the seedlings can be completely sprayed with Bordeaux mixture and then colonized, and the second spraying is carried out 7-10 days after the planting. In the high incidence of early blight, pesticides are sprayed in time to eliminate germs. After the early blight is discovered, it is necessary to spray the bactericide according to the weather conditions to control the spread of the disease.
4, control the air humidity
The high humidity of the air is the main cause of early blight. Early blight may occur in the whole stage of tomato planting. Therefore, the tomato grown in the greenhouse must be controlled between 40% and 55% to prevent the humidity from being too high. Early blight.
The above is about the introduction of tomato early blight, it has a serious impact on the yield and quality of tomatoes, growers should take good control measures!
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