Symptoms of tomato virus disease
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What are the transmission routes and prevention measures of tomato virus disease in the field?
Mosaic type: the leaves are yellowish-green, intertwined or deep and mottled, or slightly shrinkage; Co.,
Fern leaf type: the plant is dwarfed, the upper leaves are linear, the middle and lower leaves are micro-volume, and the corolla is enlarged into giant flowers; Co.,
Stripe type: brown spots or cloud spots on the leaves, or brown patches on the stems, the discolored parts are only in the epidermis, not deep inside;
Rolling leaf type: yellowing between veins, leaf edge curling upward, leaflet twisted, deformed, plant atrophy or clumping; Co.,
Yellow top type: the top leaves are chlorotic or yellow, the leaves become smaller, the leaves are shrunk, the edges are rolled up, the plants are dwarfed, and the branches are clumped; Co.,
Necrotic type: Some leaves or whole leaves are yellowed, yellow-brown necrotic spots appear, and the lesions are irregular, mostly necrotic and dry from the edges. The diseased plants are light gray-green and have translucent light white spots.
Tomato virus disease transmission route
Field operations such as planting, pruning, snoring, tying vines, etc. transmit the venom of the diseased plant to the healthy sputum through friction; the migration and harm of locusts is also an important means of drug transmission. Generally, when the temperature is low, the viral disease does not show symptoms or the symptoms are very light. As the temperature rises, the symptoms of the leaves and ferns are generally exhibited at around 20 °C.
Tomato virus disease control measures
To prevent and cure tomato virus disease, comprehensive prevention measures based on agricultural control are adopted.
(1) Seed disinfection. Soak seeds with water for 3-4 hours before sowing, then put them into 10% trisodium phosphate solution for 30-50min, remove them with water and then germination, or soak them with 0.1% potassium permanganate solution for 30min.
(2) Rotating and purifying the land. The planting field is to be rotated for more than two years, and the conditions are combined with deep turning, and lime is applied to promote virus passivation in the soil.
(3) Using a variety of fitness cultivation techniques such as formula fertilization to enhance the host's disease resistance. These include timely sowing, early planting in a timely manner, early ploughing of alfalfa, timely soil promotion to promote rooting, late snoring, and timely watering. The growers should combine the growth of tomatoes, the degree of TY virus damage, the expected speed of TY virus development and other prevention and control measures, and optimize the selection of the following options: early stage of the disease: available 20% hydrochloric acid morpholinium acetate copper WP 500 times liquid, Haohao high-tech 2 % amino oligosaccharide aqueous solution 300 times solution, 1.5% phytopathogenic emulsion 1000 times solution, 3 ribavirin (32% nucleoside bromomorpholinium) aqueous solution 500 times solution, 2% nymidine water The agent is 150-250 times liquid, 5% bacteria poison water clearing agent 300-500 times liquid, and other bactericidal pesticide spraying, spraying once every 5 to 7 days, continuously spraying 2 to 3 times.
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