Rapid decay of strawberries caused by Botrytis cinerea how to control Botrytis cinerea

Botrytis cinerea of strawberry, the main disease of strawberry in greenhouse, once infected, strawberry will rot and spread quickly, which has a great impact on yield, and the heavy one can reduce the yield by more than 40%.

Strawberry Botrytis cinerea

I. conditions for onset of the disease

The suitable temperature for the development of strawberry Botrytis cinerea is 18Mel 25 ℃, and the air humidity is more than 80%. Stagnant water in the field, over-dense planting, improper ventilation and so on will aggravate the occurrence and spread of strawberry gray mold.

Second, symptoms

When the flower organ is infected, water-stained needle-eye-sized spots first appear on the calyx, then expand into larger subcircular or irregular disease spots, and gradually extend from the calyx to the ovary and the young fruit of strawberry, and finally the young fruit is wet and soft and rotten. When the humidity in the shed is high, there is grayish brown mildew in the disease part. Strawberry infection mainly occurs on the green fruit, the first fruit top stigma, showing waterlogged disease spot, and then turn gray-brown spot, at the same time, the pathogen infects the strawberry deeply. When the air is wet, the diseased fruit is wet and soft rotten, and when the weather is dry, the diseased fruit is dry and rotten, which eventually causes strawberries to fall. The damage to the leaf usually occurs at the base of the leaf near the petiole, showing small water-like spots at first, then expands outward into nearly oval, semicircular or irregular grayish brown spots, and finally spreads to the petiole, and the leaves die.

III. Prevention and control methods

1. Agricultural prevention and control: reasonable close planting to ensure suitable plant and row spacing. Strawberry shed requires good ventilation, pay attention to drainage after rain, timely ventilation and light, reduce the humidity in the shed. Often remove rotten fruit, sick and old leaves, deeply buried or burned, reduce pathogens.

2. Chemical control: use 1000 times of prohydantoin, or 1000 times of 50% Prochloraz, or 60,800 times of thiophanate methyl, or 800times of methomyl, or 800times of cinerein, or sclerotiorum Alternately spraying strawberry plants with 1000 times "Tianda-2116", or spraying strawberry plants alternately with 5% carbendazim dust 1000 grams per mu greenhouse, or 5% carbendazim dust powder 1000 grams per mu greenhouse, or 1000 grams per mu greenhouse, or 1000 grams per mu greenhouse spray powder powder, or 65% carbendazim suspension 1000 times liquid, or 65% carbendazim 1000 times liquid, or 1000 times "Tianda-2116" alternate spraying strawberry plants, or 5% carbendazim dust powder per mu greenhouse 1000 grams per mu greenhouse, or 5% carbendazim dust powder 1000 grams per mu greenhouse, or 6.5% carbendazim dust spray per mu greenhouse smoke fumigation.