Early spring is the high season of Botrytis cinerea. The symptoms of hard fruit-type tomatoes infected with gray mold are that the bacteria invade directly from the skin and form white and greenish green spots with a diameter ranging from 3 to 8 mm, which are commonly called "ghost-face spots." It is an unusual symptom of gray mold in domestic breeds.
During the visit to the vegetable farmers, farmers often told me that the fruit of this spotted problem was treated as an ulcer disease, and the medicine was not cured. Distinguish between these two kinds of disease that the hard fruit type tomato confuses easily now: The same point is the infected fruit, does not fester, the fruit surface does not have the mold, only causes the circular spot. The difference is that the hard fruit type gray mold disease results in a grayish-white ring spot of varying size in the water surface of the fruit, and the diseased spot of the canker disease fruit is the white dot of the fruit surface uplift, each of which has a central spot. A tiny light brown corked bulge is called "bird's eye spot". Several bird's eye patches are connected together to form a ward-like raised area on the fruit surface. There are needle-like feelings like the mosquitoes bite.
Tomato ghost spots must be controlled according to gray mold. Shelter-sheds should be cultivated on high-covered land and film, and small water should be poured through the membrane. If conditions are available, drip irrigation measures can be considered to save water and control humidity. To enhance ventilation and light transmission, especially on cloudy days, in addition to paying attention to insulation, we must also strictly control irrigation and prevent overdose. In the early spring, the morning release was changed to a short time in the early morning and the morning fog was released as early as possible. Because the gray mold is infected during the flowering period, first of all, it is necessary to carry out the flowering prevention during the flowering of the flower buds. Usually, 1.5 to 2 kilograms of the flower liquid is added with 10 ml of Suspension or 3 g of Swiss or 0.5 g. The friend's agent sprays, wipes, or soaks flowers. Then spray the plants as a whole, such as 4000 times of the Huiyou 50% WP, 1200 times the 50% and Reshui Dispersible granules, 600 times the 50% milwax Kang WP, 800 times Liquid 50% Fasting Wettable Powder.
Tomato bird eye spot disease needs to be controlled according to tomato ulcer disease. The occurrence of ulcer disease in tomato planted in early spring caused more lesions in the phloem and pith of the transduced tissue of the plant, resulting in grayish white to gray-brown lesions on the main stem. Cut stems can be seen in the stem browning, both sides of the upper and lower expansion. At the late stage of infection, the base of the stem became thicker, the stem had spots, the stem was hollow, and the lesion subsided or split. In wet conditions, the stem and petioles will overflow bacilli, and in severe cases the whole plant will die. The upper part of the plant was wilting and blue-green. Most of the fruit infections occurred in the summer in tomato, summer in the rainy season, sprinkler greenhouses and greenhouses, the fruit susceptible to disease.
Prevention should be strictly controlled by adopting high ridge cultivation and prohibiting farm operations with dew or pruning under wet conditions. Chemical control: In the initial stage, 47% Garnett WP 800 times solution or 77% WP 500 times solution or 27.12% copper noble suspension agent 800 times solution can be sprayed or irrigated. The use of copper sulphate 1.5 to 2 kilograms per acre to water the soil after application can prevent ulcers, use bacterial spray or smear stalks and wounds can also be controlled.
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