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How To Deal With Tomato Leaf Rolls
High temperature leaf roll tomatoes in the temperature above 30 ℃ will be slow growth, increased light respiration, affecting nutrient accumulation. Continuous high temperature above 35 ℃, the plant leaves water transpiration accelerated, the root system water transfer rate can not keep up with the leaf transpiration rate, it is easy to cause the leaf surface dehydration upward leaf roll.
Prevention and treatment methods: the production of tomatoes in protected areas, the timely addition of shade nets, increase the shed vents, pay attention not to remove the insect protection net. Spraying 6000 times of Biocare can alleviate the leaf curl disease.
The appropriate temperature requirements for the growth of low-temperature leaf curl tomatoes is to maintain daytime temperatures around 25°C and night temperatures of 16°C to 18°C. The low-temperature threshold for stopping growth is 10°C. Continuously below 10 ℃,hydroponic farming the leaf pulp cells will be chilled, the leaves bend downward until the leaf pulp cells freeze and bleach.
Prevention and treatment ...
... methods: cold season protective land production of tomatoes, when the greenhouse temperature is not enough to ensure that the tomato growth requirements, it is recommended to add a hot line heating or temporary increase in the furnace fire to raise the temperature to promote growth. At the same time, spray 7500 times liquid Bi-Care, combined with water spraying 1 to 2 times foliar spray fertilizer. When the leaves are yellow, you can spray foliar fertilizer such as leaf green treasure, Gummi green, Rui Pei green 1000 times for conditioning.
Over-fertilization causes leaf curl Fertilization programs are based on the target yield of tomatoes, and the amount of washout fertilizer applied at one time should be determined by the current number of fruit spikes. Excessive flushing fertilizer can cause excessive local fertilizer concentration in the soil, resulting in root and leaf margin blotchy leaf rolls.
Prevention and treatment methods: reasonable application of fertilizer, control the amount of water-soluble washout fertilizer is an important measure to reduce fertilizer damage.
Herbicide damage caused by leaf curl neighboring plots of corn field application of closed herbicide, easy with the airflow to produce drift, causing damage to the surrounding tomato plants, resulting in tomato leaves on the roll, stiff and brittle.
Prevention and treatment methods: general light symptoms of leaf curl can be sprayed with erythromycin 4000 times to alleviate the symptoms, but also can be sprayed with Biocare 5000 times to promote leaf curl unfolding. At the same time, strengthen the fertilization to promote plant growth, the relief effect will be better.
Symptoms of tomato plants infected with fern-leaf virus are first dwarfing of varying degrees,hydroponic equipment with all or part of the leaves curling upward from top to bottom.
Prevention and treatment: Foliar spraying of 20% virus A wettable powder 500 times, 1.5% phytophthora emulsion 1000 times, etc.
Tomato leaf curl disease what drug
One, after planting tomatoes to before fruiting drought exercise, after fruiting timely watering and fertilization, high summer cover shade net to prevent high temperature drought.
Second, the summer heat season to minimize the concentration of drugs, once the drug damage, you can promptly spray water or spray foliar fertilizer to solve the drug damage.
Third, tomatoes should not use excessive nitrogen fertilizer during the growth period, increase the application of phosphorus and potassium fertilizer, especially in the summer to prevent tomato plant growth, the use of nitrogen fertilizer should be controlled. Also try to choose to grow tomatoes in non-saline areas, saline land can be implemented soilless cultivation or soil reform measures.
Fourth, remove tomato side branches also called fork, generally to be carried out when it grows to more than 7 cm, if forked too early, the leaf assimilation area is reduced, too much to branch leaves, the plant above-ground growth is poor, while affecting the development of the root system, water absorption, fertilizer absorption capacity is weakened, and then induced leaf curl. Commonly there are tomatoes once to branch, fork, pick too much leaf, after the occurrence of leaf curl is this reason.
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