Tomato leaf curl is only the external manifestation of the disease, and it is the physiological response of the crop to the adverse environment or various hazards. The causes and treatment methods of the disease are as follows:
1, high temperature coil
Tomatoes grow slowly when the temperature is above 30 °C, increasing light respiration and affecting nutrient accumulation. When the temperature is above 35 °C, the water transpiration of the leaves of the plant is accelerated, and the water transport rate of the roots can not keep up with the transpiration speed of the leaves, which is easy to cause the surface dehydration of the leaves to curl up.
Treatment measures:
To protect the production of tomatoes, it is necessary to add shade nets in time to increase the vents of the sheds, and be careful not to remove the insect nets. Spraying Jiameijin points after spraying water or watering can alleviate the problem of curling leaves.
2, physiological leaf curl
(1) Soil drought or soil damage or root development is poor or damaged, or the root water absorption capacity of plants above three spikes is weakened, and the leaves of high temperature plants have large transpiration and more water loss. In order to reduce water loss, the leaves of plants are curled, which is a physiological protection phenomenon.
(2) The greenhouse production of tomatoes in the greenhouse is too rapid, or the land tomato will encounter the phenomenon of rolling leaves when it encounters dry hot air.
(3) Excessive application of nitrogen fertilizer, especially the lack of nutrients such as zinc, iron, manganese and magnesium in the soil, will also roll the leaves. Such leaf curls are often accompanied by symptoms such as yellowing, yellowing, and purpleing of the leaves.
(4) Plants are pruned, smashed, topped too early, too heavy, and the phosphorus absorbed by the roots is nowhere to be transported, and will accumulate in the lower leaves to make it harden and curl.
Treatment measures:
Rushing Jiamei dividend or Jinli, activate the soil, promote root growth, improve absorption capacity, and at the same time, the leaf surface supplements the micro-nutrient Jiamei brain white gold and gold spots.
3, low temperature coil
The suitable temperature requirement for tomato growth is that the daytime temperature is maintained at around 25 °C, the night temperature is between 16 °C and 18 °C, and the low temperature critical point for stopping growth is 10 °C. Below 10 ° C below, the mesophyll cells will suffer from cold damage, and the leaves will bend downward until the mesophyll cells freeze and whiten.
Treatment measures:
In the cold season, the tomato is produced in a protected area. When the temperature of the greenhouse is insufficient to ensure the growth of the tomato, it is recommended to add a geothermal line to warm up or temporarily increase the temperature of the fire to promote growth. At the same time, the foliar spray of Jiameijin points 1-2 times. When the leaves are yellow, they can be sprayed with Jiamei brain white gold for conditioning.
4, the virus infected leaf
Symptoms of tomato plants infected with fern-type virus disease are characterized by different degrees of dwarfing, and the leaves are curled up from the top to the bottom of all or part of the leaves.
Treatment measures:
Foliar application of 25% Aketai water dispersible granules 2500-5000 times solution, 20% virus A wettable powder 500 times solution, 1.5% phytopathogenic emulsifiable concentrate 1000 times solution.
5, herbicides
The application of the herbicide in the corn field adjacent to the plot is easy to drift with the airflow, causing phytotoxicity to the surrounding tomato plants, causing the tomato leaves to roll up, stiff and brittle.
Treatment measures:
Generally, the symptoms of the leaf rolling can be sprayed with a smear to promote the unfolding of the leaf. At the same time, it is better to strengthen the cultivating and fertilizing to promote the root growth of the plant, and the rescue effect will be better.
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