In the greenhouse tomato growing process, due to the low temperature and humidity in the greenhouse, the air release was not timely, resulting in the production of the semi-chimpanella and botrytis germs. The bacteria directly invaded the tomato wounds and the unsuccessful petals in the diseased part. A large number of conidia caused the bacteria to grow rapidly, causing the tomato fruit to become soft and rot. The dehydration shrinks into a stiff fruit. When the damp disease develops, the diseased part has a moldy layer. When it is severe, the branches and leaves die, causing a threat to the tomato in the greenhouse. Big gray mold! ! !
Control methods: 1, strengthen the cultivation and management. Before and after the onset of growth, proper control of watering, greenhouse ventilation, reduce greenhouse humidity, reduce roof and leaf surface condensation and leaf edge spit water, timely removal of diseased leaves, diseased flowers, diseased fruit and yellow leaves, to maintain the shed The room is clean and airy.
2. During the flowering and fruiting period, use [tomato-sprout king] or [no deformity-block fruit capsule] to spray flowers and preserve fruits (reducing the production of grey mold), as the botrytis cinerea , And then quickly, if you use 24-D and anti-falling ingredients (tomato spirit) and other products to deal with, generally in 2-3 days flowers will fall off (easy to produce Botrytis cinerea). If you use [Tomato Block King], [No deformity and fruit capsules] to do flower spray treatment, you can keep the petals fresh for more than 7-10 days (which can reduce the invasion of Botrytis cinerea), and the fruit set rate can be as high as possible on rainy days. More than 90% (in the shed), and the fruit-setting rate is more than 50% higher than 24-D, anti-dropping element (tomato spirit), [Tomato Block King], [No deformity tomato seat capsule] from Shijiazhuang City, Hebei Province Agriculture Technology Development Co., Ltd. production, telephone. Mobile phone 3, drug control, early onset can be used 50% Suo Keling WP 2000 times or 50% acetaminophen WP 1000-1500 times or 75% chlorothalonil WP 600 times spray.
4, smoke agent treatment. In the early stage of disease, in order not to increase the humidity in the greenhouse, chlorothalonil smoke agents may be used. Each time, 250 grams per acre is used and smoked at intervals of 6-7 days to control gray mold.