Causes and treatment of tomato leaf curl disease

Recently, there has been a constant problem of vegetable farmers consulting tomato leaf curling. 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 biological hazard. The causes and treatment methods of the disease are as follows:

High temperature rolled tomato grows slowly when the temperature is higher than 30 °C, which increases light respiration and affects 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.

Rescue measures: To protect the production of tomatoes, it is necessary to add a sunshade net in time to increase the vents of the shed, and be careful not to remove the insect net. Spraying 6000 times of liquid to protect the curling disease.

The suitable temperature requirement for the growth of low temperature rolled tomato is that the daytime temperature is maintained at about 25 °C, the night temperature is 16 °C to 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.

Rescue measures: Tomatoes are produced in the protected area during the cold season. When the temperature of the greenhouse is insufficient to ensure the growth of tomatoes, it is recommended to add a geothermal line to warm up or temporarily increase the temperature of the stove to promote growth. At the same time, spray 7500 times of liquid and double protection, combined with water spray for 1 to 2 foliar sprays. When the leaves are yellow, they can be sprayed with foliar fertilizer such as chlorophyll, glutinous green, and celery green 1000 times for conditioning.

The fertilization method is based on the tomato target yield, and the amount of flushing application should be determined by the current number of spikes. Some vegetable growers always think that there will be higher yields when applying more fertilizers. It is not known that excessive application of fertilizer will cause excessive local fertilizer concentration in the soil, resulting in root burns and leafy leaf curls.

Rescue measures: rational fertilization, controlled application of water-soluble flushing fertilizer is an important measure to reduce fertilizer damage.

Symptoms of virus-infected leaf-leaf infected tomato plants with fern-type virus disease are characterized by varying degrees of dwarfing, with all or part of the leaves curling upwards from top to bottom.

Rescue measures: Foliar spray 25% Akthai water dispersible granules 2500 ~ 5000 times liquid, 24.7% Arica microcapsule suspension 3000 times liquid, 20% virus A wettable powder 500 times liquid, 1.5% plant disease Ling cream 1000 times liquid and so on.

The application of the herbicide to the corn field adjacent to the landfill of the herbicide is close to the airflow, causing phytotoxicity to the surrounding tomato plants, causing the tomato leaves to roll up, stiff and brittle.

Rescue measures: Generally, the symptoms of rolling leaf can be lightly sprayed with gibberellin 4000 times solution to relieve symptoms, or it can be sprayed with 5,000 times solution to promote the rolling of the leaf. At the same time, strengthen the cultivating and fertilizing to promote plant growth, and the rescue effect will be better.