Causes and Control of Tomato Leaf Curl Disease caused by upward curling stiffness of leaves

tomato leaf curl

High temperature leaf roll: Tomato will grow slowly when the temperature is higher than 30℃, increase photorespiration and affect nutrient accumulation. When the temperature is higher than 35℃, the transpiration of leaf water accelerates, which leads to the water conduction speed of root system can not keep up with the transpiration speed of leaf, resulting in the upward rolling of leaf surface dehydration. Treatment measures: Protected tomato planting, to timely add sunshade net, increase the greenhouse ventilation, be careful not to remove insect nets. Spraying Bihu 6000 times solution can alleviate leaf roll disease.

Low temperature leaf roll: tomato growth temperature is about 25℃ during the day, night temperature 16℃~18℃, low temperature critical temperature to stop growth is 10℃. Below 10℃, mesophyll cells are damaged by cold, and leaves bend downward until the cells freeze and whiten. Treatment measures: cold season protected planting tomatoes, when the shed temperature is not enough to ensure tomato growth requirements, it is recommended to add geothermal heating or temporary increase the fire temperature. At the same time, spray 7500 times solution of Bihu, and spray foliar fertilizer for 1~2 times in combination with water spray. When the leaves are yellow, foliar fertilizers such as Yelubao, Gumi Green and Ruipei Green can be sprayed for conditioning.

Over-fertilization and leaf burning: Fertilization scheme is formulated according to tomato target yield, and the amount of application should be determined by the current number of ears. Some vegetable farmers always think that more fertilizer can produce high yield, but they do not know that excessive fertilizer will cause high local fertilizer concentration in the soil, resulting in root burns and leaf edge withered spots. Treatment measures: rational fertilization, control of the amount of water soluble irrigation fertilizer.

Virus infection leaf curl: tomato plants infected with fern leaf virus disease first appeared different degrees of dwarfing, all or part of the leaves curled up from top to bottom. Treatment measures: foliar spraying 25% Actay water dispersible granules 2500~5000 times solution, 24.7% Arica microcapsule suspension 3000 times solution, 20% virus A wettable powder 500 times solution, 1.5% Zhibingling EC 1000 times solution, etc.

Herbicide Phytotoxicity Rolled Leaves: Closed herbicides applied to adjacent corn fields are easy to drift with airflow, causing phytotoxicity to tomato plants, causing tomato leaves to roll up, stiff and brittle. Treatment measures: light can spray 5000 times of Bihu liquid to promote leaf roll. At the same time, strengthen the cultivation of fertilizer to promote tomato plant growth, rescue effect will be better.