Strawberry gray mold specific medicine, mainly with ipromil, clerotin, fludioxonil and multi-antibiotic

The specific drugs of strawberry Botrytis cinerea are isocarbamide, sclerotiorum, cyclizil and polyantimycin, which can easily lead to strawberry botrytis cinerea when the temperature is 0-35 ℃, humidity is 80-90% or there is water on the plant surface.

Specific drug for gray mold

Iso-carbamide is a broad-spectrum contact fungicide, which can play a role in mycelium, sclerotia and spores at the same time, better control spore germination and mycelium growth, can not penetrate in plants, and is a protective fungicide. It has a good bactericidal effect on Botrytis cinerea, Sclerotinia, Sclerotinia, Streptomyces, Cercospora and so on.

Sclerotia net: sclerotia net is an exclusive powerful fungicide developed by experts for crops prone to infection of bacteria, fungi, viruses, etc., which has the characteristics of broad spectrum, sterilization, treatment, internal absorption, penetration and long effective period, as well as the dual effect of internal absorption and permeation. foliar spraying can quickly infiltrate to the parts of the disease and completely kill all kinds of bacteria from the surface to the inside.

Fipronil: by controlling the transfer related to glucose phosphorylation, fipronil can control the growth of fungal mycelium, resulting in the death of bacteria. Its action mechanism is unique and has no cross-resistance with existing fungicides.

Polyantimycin: polyantimycin belongs to the metabolite produced by Streptomyces aureus, is a broad-spectrum antibiotic fungicide, has good internal absorption, is composed of organisms that interfere with the cell wall, and can control the sporulation of bacteria and the spread of disease spots.

Characteristics of gray mold

Strawberry Botrytis cinerea belongs to mycelium and conidia, which can winter in the soil with sclerotia and diseased bodies, and can be transmitted through watering, airflow and agricultural activities. Generally, when the temperature is 0-25 ℃, the humidity is more than 90%, or when there is stagnant water on the plant surface, it will cause the disease, and when the temperature is 0-35 ℃, the humidity is more than 80%.

High humidity in the air, overcast and rainy days after watering, and stagnant water in low-lying areas will be conducive to the occurrence of strawberry botrytis cinerea. Usually, the disease will be more serious when planting in flat beds and lying with plastic film. In high ridges and plastic film planting, the disease will be relatively mild.

Botrytis cinerea symptoms

The disease of strawberry gray mold usually begins at the flowering stage. In the initial stage, the pathogen is infected from the weaker parts of strawberries, causing the flowers to die and rot in light brown, and gray mold will be produced in the later stage, which will gradually invade around the old yellow leaves at the bottom and form V-shaped yellow-brown spots, or begin to infect along the falling parts of the petals, and later will become round necrotic spots, the wheel pattern is not very obvious, and a small amount of gray mold will be produced above.

The infection of strawberry fruit starts from the residual petals and the place that touches the ground, and it can also invade from the initial stage and the place where the diseased tissue touches. In the early stage, the grayish brown mold leads to plant necrosis, and its color will gradually deepen. In the later stage, it will lead to fruit rot, and a dense gray mold layer will appear on the fruit surface. When the petiole occurs, it will show light brown disease spots and lead to petiole necrosis and dry shrinkage. There will be a small amount of sparse gray mold on it.

Prevention and control of gray mold

Thoroughly remove strawberry leaves after harvest, spray the soil, greenhouse film and wall before transplanting and seedling preparation, which can eliminate the bacteria and increase the efficacy with spraying new high fat film.

Drip irrigation and high ridge plastic film mulching can be adopted to plant, ultraviolet blocking film can be used to inhibit sclerotia germination, spraying can be used in the early flowering, flowering and fruit setting period and before watering, which can accelerate fruit development, protect flowers and fruits, and make its nutrition balanced. It can also prevent strawberry deformities, improve the quality and yield of strawberries, appropriately increase air release after watering, and use 70-100 times liquid to prevent and control strawberries.

Note: diseased flowers, leaves and fruits should be removed in time when the disease occurs, and then put into a plastic bag and taken outdoors for treatment, and the indoor temperature should be raised appropriately when the disease occurs.