Greenhouse tomato enters the flowering and fruiting period. With the increase in top dressing and watering times, early blight, leaf mold, and gray mold are prone to occur. Now the symptoms and control methods of the main tomato diseases in greenhouses are described as follows:
First, the symptoms
1. Early blight. Tomato leaves, stems, and fruit can be diseased, but the main victims are leaves. After the leaves were damaged, the water-stained dark brown spots began to appear. After enlargement, they were nearly round or irregular in shape. There were concentric rings on the lesions, and the lesions grew out of black mold under moist conditions. It starts from the lower leaves of the plants and gradually develops upwards. When severe, the lower leaves die. Petioles, stems, and fruits onset, initially dark brown oval lesions, slightly dilated after expansion, with black mold and concentric rings.
2. Gray mold. The main damage is the tomato flower organ and the young green fruit. The disease first infects the petals and torus left on the green fruit and the remaining stigma, and then spreads to the fruit and stalk, turning the peel into grayish white and soft rot. Later on the fruit surface, receptacles and pedicels appear a large number of gray mold layer, after the fruit dehydration rigidity, the formation of sclerotia on the fruit surface. The leaf blade usually starts from the tip of the leaf and develops in a V-shape from the edge to the inside. It is a light-brown water-stained pattern with a dark and light ring vein pattern. The surface has a few mold layers and the leaves later die.
3. Leaf mold. The main damage to the leaves, the early stage of the formation of the back of the leaf to form a nearly round or irregular gray-white mildew, the latter lesions spread full of leaves back, the color turned dark green; yellow leaves appear positive lesions, severe mildew, and finally Leaves yellowish and curly.
Second, control methods
1. Agricultural control. Select disease-resistant varieties, pay attention to crop rotation, sparse planting. When planting, the ground covered with plastic film, reasonable fertilization and watering, timely ventilation and dehumidification. Hanging fruit in sunny morning watering, cloudy or early evening should not be watered, to avoid excessive humidity and induce disease. The dried petals and diseased fruits as well as the diseased leaves in the lower part of the fruit surface were promptly removed and taken out of the field and buried deep.
2. Drug control. 1 early blight. With 70% thiophanate-methyl 800 times, 75% chlorothalonil 600 times, 70% mancozeb 500 times, 77% can kill 500 times, alternating spray; rainy weather should not spray, use 45 % chlorothalonil smoke agent fumigation, 250g per 667 square meters of medication. To stop the application of tomatoes 10 days before listing, to avoid fruit contamination. 2 gray mold. Take hormone-contaminated flowering to prevent prophylaxis, that is, when the temperature of the first flower spike of tomato is 50% after flowering, when the temperature is lower than 20°C, use a brush to pick up 50ml/L of anti-dropping liquid (or 15 to 20ml/L2,4-D) and 0.1 % Skolling mixed flower stalk; air temperature 20～30°C sprayed with 30ml/L anti-dropping liquid and 0.1% quick keratin; air temperature is higher than 30°C with 10ml/L anti-dropping agent and 0.1% speed Kling liquid spray flowers. As the temperature rises, the concentration of anti-dropping hormone should be gradually reduced. When the flower is sprayed, it cannot meet the growing point to prevent phytotoxicity. In the early stage of disease, 50% fast keratin (or prodimethohexine) 1000 times solution, 40% Shijiale 600-800 times solution, 65% tymecide 600 times solution, alternating sprayed flowers and young fruit, once every 7 days, even Spray 2 or 3 times. 3 leaf mildew. With 40% DuPont Fuxing 5000 times or 47% Garnett 800 times alternating spray, spraying once every 7 days, and even spray 3 to 5 times.
Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
 Surgical LED Light
Surgical LED Light is a lighting tool used in surgery. It has the characteristics of Shadowless Operating Light and uniform brightness.
Aperture adjustment: Aperture aperture can be continuously adjusted: 20mm~130mmDouble Head Dome Cold Light
Deviation angle: user precise adjustable
Brightness adjustment: the head frame can be raised and lowered, the lighting switch is designed on the head frame, and the brightness can be controlled by itself
Optical system: advanced multi-coated optical system to achieve maximum illumination brightness
Weight: 3S LED only weighs 70g, with brightness adjuster and connecting cable only 90g
Use time: The portable rechargeable battery box can be used for 4 hours, and the battery box can also be directly connected to the power supply
Surgical Led Light,Shadowless Operating Light,Cold Light Led Surgical Lamp,Double Head Dome Cold Light
Haloxylon Ammodendron Medical Equipment Co., Ltd. , https://www.ssmedicaldevic.com