Disease control of strawberry

1. Leaf spot

Also known as snake eye disease, it mainly harms leaves, petioles, fruit stalks, young stems and seeds. Small dark purple spots form on the leaves, which expand into nearly circular or oval spots with purple-red-brown edges and grayish-white centers with slightly fine rings, making the entire spot look like a snake's eye. No small black particles form on the spots.
Prevention and control measures: Remove diseased and old leaves in time. In the early stage of the disease, use 500-700 times diluted 70% thiophanate-methyl wettable powder, and spray again after ten days. Or use 70% mancozeb wettable powder, 200 grams per mu, spray with 75 kg of water.

2. Powdery mildew

It mainly harms leaves, but also attacks flowers, fruits, fruit stalks and petioles. The leaves are rolled up into a spoon shape. The affected flower buds and petals turn purple-red and fail to bloom or fully bloom. The fruits do not swell but become elongated in shape; the young fruits lose their luster and harden. If strawberries are damaged during the ripening period, they will lose their commercial value.

Prevention and control measures: Focus on spraying 0.3 degree Baume lime sulfur mixture on and around the diseased center plant. After harvesting, cut the leaves in the entire garden and spray them with 1000 times diluted 70% thiophanate-methyl, 800 times diluted 50% thiophanate-methyl, and 5000 times diluted 30% tebuconazole.

3. Botrytis cinerea

It is the main disease after flowering, and can occur on flowers, petals, fruits and leaves. During the expansion period

Brown spots form on the fruit and gradually expand. Gray mold grows densely, causing the fruit to soften and rot, seriously affecting yield.

Prevention and control measures: Carry out from budding to flowering stage, spray with 300 times diluted 25% carbendazim wettable powder, 800 times diluted 50% captan wettable powder, 500-700 times diluted 50% chlorpyrifos, etc.

4. Root rot

Starting from the lower leaves, the leaf edges turn reddish brown and gradually wither upwards until they die. The pillars begin to turn dark brown and decay in the middle, and the central column of the roots is red. Prevention and control measures: Before transplanting strawberries, use 600 times diluted 40% asparagus green powder, pour it on the bed surface, then cover with soil, level the ground for transplanting, so as to effectively kill the pathogens in the soil, reduce the base number of fungal sources in the field, and reduce the chance of infection.

5. Verticillium wilt

This disease is a soil disease, and the main symptoms are deformed young leaves, yellowing leaves, and extremely rough leaf surfaces. The leaf edges then turn brown and wither inward until they die.

Prevention and control measures: strictly introduce disease-free plants for planting; shorten the renewal period; disinfect the soil with 13.5 to 20 liters of chloropicrin or solar-powered film irrigation; those that have become diseased must be removed and burned.