First, spot blotch, leaf spot
1, spot blotch. Mainly damage to the leaves, but also damage the petiole and stem. At first, it was a light brown oil stain, and then developed into a yellow-brown to gray-brown necrotic spot. There is a yellow halo at the edge of the lesion, which produces a purple-red to rust-brown uneven distribution of small particles. Low temperature and high humidity are conducive to the occurrence and prevalence of diseases. The temperature is 20-25 °C, and the weather is humid and rainy.
2, leaf spot disease. The disease is mainly caused by harmful leaves and stems and petioles. The leaves are yellow-green water-stained spots at the beginning of the disease, and then spread into near-circular or irregular-shaped gray-brown necrotic spots with no obvious edges, purple-brown to dark brown. The air is damp, and the gray-white mildew layer is formed on the lesions, and multiple of them merge with each other to cause the leaves to die. Spraying at the beginning of the disease, spraying once every 7-10 days, even spraying 2-3 times. You can choose 20% love 1 500 times solution, or mancozeb 800-1000 times solution, or Daisen zinc 800-1000 times solution, or chlorothalonil 800-1000 times solution.
Second, sclerotinia
It is mainly harmful to the petiole, which is mostly infected by the base of the stem. It is light brown water stain in the initial stage, and develops rapidly in all directions. The diseased tissue is ulcerated and soft rot. Later, gray mold layer is formed on the surface of the diseased part, and the diseased branches and leaves die with the disease. In the early stage of the disease, timely application of drugs. It can be used for the control of 20% barrels of water, or 1500 times solution of iprodione or 800-1 200 times solution of pyrimethanil.
Third, soft rot and bacterial leaf spot
1. Soft rot. It mainly occurs at the base of the petiole or at the base of the stem. In the initial stage, water-stained depressions are formed, which are spindle-shaped or irregular, with light green and green. With the development of the disease, the diseased parts quickly rot, brown, and smelly. The diseased plants finally stumble, and the diseased part only leaves the epidermis or vascular bundle tissue. More seedlings cause rotten heart death.
2. Bacterial leaf spot. It is mainly harmful to the leaves, and in severe cases, it is also harmful to the petiole. In the early stage of leaf infection, oily spots appear on the front and back of the leaves, and later develop into taupe to yellowish brown irregular necrotic spots, central depression, darker edge, oily stains, and more radiation spread along the veins, multiple lesions Interconnected into irregular large necrotic spots, the center is grayish white, the edges are brown, with oily luster, and severely broken from the diseased part.
3, application of drug control. At the beginning of the onset of the disease, the drug was administered once every 5-7 days and continuously administered 2-3 times. It can be used to prevent or rot the roots of the 600-800 times spray, or it can be sprayed with fine stars (or can be killed) 600-800 times.
Fourth, gray mold
More from the heart of the water, the edge of the leaves, or the damaged petiole and the yellow outer leaves of the lower part of the plant began to infect. The diseased part is water-stained necrosis and rot. Later, gray mold layer is formed on the surface of the diseased part. The diseased branches and leaves are wilted and die, and the early stage of the disease is timely applied and controlled. It can be used for the prevention and control of 20m L of water, or 1500 times of carbendazim or 800-1200 times of pyrimethanil.
5. Beet armyworm (green worm)
The beet armyworm can be treated with 1000 times liquid and spray 1000-1500 times spray.
6. Aphid mites can be sprayed with 10% imidacloprid 2500 times spray.
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