What specific medicine is used for the latest strawberry gray mold?

Strawberry Botrytis cinerea has occurred in all strawberry cultivation areas in China, and the disease has gradually intensified since the 1970s, especially during the spring rain in the south. The disease rate of fruit rot susceptible varieties is about 30%, and the serious ones can reach more than 60%. It has a great impact on the yield and quality of strawberry. Let's take a look at what specific drugs are used for strawberry gray mold.

Symptoms of strawberry gray mold

Botrytis cinerea of strawberry mostly starts from the flowering stage, and the pathogen initially infects the abortive flowers or weaker parts, making the flowers show light brown necrosis and rot, resulting in a gray mildew layer. Most of the leaves invade from the edge of the old yellow leaves at the base, forming a "V" shaped yellow-brown spot, or infecting along the place where the petals fall, forming a near-round necrotic spot, on which there are not obvious wheel patterns and sparse gray mold. Most of the fruit infection starts from the residual petals or the parts close to or in contact with the ground, and it can also invade from the early contact with the diseased tissue, showing water-stained grayish brown necrosis at first, then the color becomes darker, the fruit rots, and a dense gray mildew layer is produced on the surface. Petiole disease, showing light brown necrosis, dry shrinkage, sparse gray mold is produced on it.

Characteristics of Botrytis cinerea in strawberry

Strawberry Botrytis cinerea overwinters with mycelium and conidia in the soil with diseased remains or sclerotia, and spreads through air flow, watering or agricultural activities. The disease can occur at a temperature of 0: 35 ℃ and a relative humidity of more than 80%. It is suitable for the disease to occur at a temperature of 0: 25 ℃, humidity above 90%, or stagnant water on the plant surface. High air humidity, or rainy days or low-lying water after watering, are especially conducive to the occurrence and development of the disease. According to the investigation, the disease of flat bed planting or lying planting with plastic film is serious, and the disease of high ridge and plastic film cultivation is mild.

Control of strawberry gray mold

The main results are as follows: 1. Thoroughly remove the sick and residual fallen leaves after harvest, spray the surfaces of greenhouse film, soil and walls before transplanting or seedling preparation, disinfect and sterilize, and cooperate with spraying new high fat film to enhance the efficacy.

2. High ridge plastic film mulching or drip irrigation water-saving cultivation, ultraviolet blocking film was selected to inhibit sclerotia germination, spray control in early flowering, flowering and fruit setting stage and before watering, promote fruit development, focus on flower and fruit protection, coordinate nutrition balance, prevent strawberry deformity, make strawberry high yield and high quality, and increase air release after watering. Spray with mildew-stopping liquid of 70 to 100 times.

3. Once the disease occurs, the diseased leaves, flowers and fruits should be removed in time and carefully, put in a shed in a plastic bag and properly disposed of outside. After the onset of the disease, the management temperature should be raised appropriately.