First, the symptoms:
The disease is also known as brown spoilage, tomato fruit disease. Mainly harmful to immature fruits. First, the light brown spots on the top of the fruit or the surface of the fruit shoulders sometimes grow white mildew, and then gradually form concentric scaly spots, which gradually turn dark brown, and the subcutaneous pulp also browns. When the humidity is high, the disease minister has a white mildew, and the diseased fruit remains as it is, does not soften, and is easy to fall off. The leaves are infected, and large chlorotic spots appearing in the form of water immersion, slowly decaying, and some can be concentric. Tomato plague has occurred in various places and is one of the main causes of tomato rotten fruit. Most occur in the growing green fruit,
Second, the incidence of law:
Overwintering on the ground with oospores or chlamydospores with diseased bodies. The rainwater splashed on the fruit near the ground. After the germs sprouted, the germ tube was produced, and the disease was invaded from the peel. The hyphae of the diseased part produced sporangia and zoospores, which were transmitted through rainwater and irrigation water to infect. At the end of autumn, oospore or chlamydospores form winter. The developmental temperature limit is 8-38 ° C, and 30 ° C is optimal. The relative humidity is higher than 95%, and the hyphae develop well. July-August, high temperature and rainy seasons or low-lying, soily and heavy plots are heavy. The early spring shed gray mold disease and the plague disease on the tomato damage parts, the color of the mildew layer, etc. are slightly different, but the conditions of the disease are basically the same, in the low temperature and high humidity environment, easy to occur. In particular, cherry tomatoes have a large amount of flowers during the concentrated flowering period. The above two diseases mainly harm the fruits and flowers, and are the "big enemy" for the formation of cherry tomatoes.
Third, the prevention and treatment method
Due to the rapid onset of the disease and the value of the rainy season, preventive measures should be taken.
(1) Choose plots that have not been planted with Solanaceae vegetables for 3 years, have high topography, good drainage, and sandy soil.
(2) Fine land preparation before planting, ditch and channel smooth, to deepen the ditch, high soil, reduce soil water content; timely pruning and playing the right, remove the old leaves, leaves, so that the air around the fruit.
(3) Covering with mulching film to prevent pathogens from splashing onto the lower leaves or fruits of the plants by irrigation water or rain.
(4) Strengthen field management, timely remove diseased fruit, bury it deeply or burn it.
(5) Chemical control: timely spraying and prevention of drugs in the early stage of the disease, the drug can be selected: 58% metalaxyl manganese-zinc wettable powder, 40% ethyl phosphorus aluminum wettable powder 300 times liquid, 64% anti-virus wettable powder 400 times, 25% of the genus Resveratrol 65% of the zinc 1:1 ratio of the synthesis of 500 times, spraying the focus on the ear and the ground, spray 3 hours after the spray to be sprayed again.
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