Botrytis cinerea is one of the most serious fungal diseases after flowering in strawberry, and it can be attacked in both open and protected areas. The incidence of strawberry in protected areas is particularly serious. Because gray mold can cause 10-30% reduction in rotten fruit weight, More than 50%. Petiole, leaf, bud and pedicel may be infected in early stages, but the incidence of fruit is dominant, and the symptoms are most obvious at the ripening stage of berries.

First, the harm symptoms

Leaf and stalk onset. The diseased part has brownish or dark brown water stains. Sometimes the lesions are slightly rimmed, and when the skin is wet, there is a milky white fluffy mycelial cluster.

Flower buds and pedicel disease. Petals turn dark brown, lesions often surround the petiole, pedicel, and later spread to death.

Fruit onset. The bacteria first invaded the small fruit, and the fruit surface that was in contact with the soil surface first developed the disease. After the fruit stem was spread to the peduncle, the dry rot died. In the case of infringing on the fruit that has been transformed, a small, brown, spotted, brownish spot initially appears. When the humidity is high, it rapidly expands. The berry rots and the flesh softens. In addition, the germs can also form flat black murine-like sclerotia on the killed plants.

Second, control methods

Once the disease is difficult to completely eradicate, it should be dominated by agronomic practices, supplemented by chemical agents.

1, agricultural control. To avoid excessive application of nitrogen fertilizer and excessive irrigation, increase phosphorus and potassium fertilizer, appropriate thinning, control overgrown plants to ensure good ventilation and light transmission. Protecting the land with high ridge drip irrigation management techniques can reduce the incidence.

The resistant varieties were selected for mulching or fruit mating to prevent fruit from contacting the ground.

For the treatment of soil with pesticides, apply 25% carbendazim WP 5-6 kg per acre before planting to prevent soiling.

2. Ecological control

In protective cultivation, the amount of air release can be increased during flowering and fruit growing period, so that the humidity in the shed can reach 50% or less, the temperature in the shed can be increased to 35°C, and the shed can be shed for 3 hours, then the air can be cooled to reduce the temperature, and the continuous boring shed 2-3 times. In addition to control of gray mold disease, it also has a certain inhibitory effect on powdery mildew.

3, chemical control. After the inflorescence is exposed to flowering, thiophanate-methyl wettable powder, leconazole suspension, Shigao Shui agent and Kedisan WP can be sprayed once every 7-10 days for 2-3 consecutive times. To a good control effect.

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