Recently, the temperature has been high, and the rain has increased, and the spots on the strawberry leaves have increased.
Recently, a berry friend sent a few photos, he felt very confused, the leaves are rolled up, the leaf edges are yellow, and there are many lesions of different sizes on the leaf surface, which look like horn spot disease from the back of the leaf.
The back of the leaf looks like horn spot disease
He felt that the curling of the leaves was infected with powdery mildew, whether the leaf spots were also infected with leaf spot, could it be that a variety of diseases caused such a result?
In fact, leaf curl is not necessarily powdery mildew, and leaf spots are not necessarily leaf spot. It's about what the situation is.
Judging by the communication and the overall situation, it was found that it was caused by brown spot disease.
Here is a photo from that time
Brown spot is a fungal disease that mainly damages the leaves of strawberries and can cause plant death in severe cases.
First, let's take a look at the symptoms when it damages plants:
Strawberry brown spot can also be called strawberry leaf blight. After he appears a spot on the leaf, the middle of the spot is grayish-white, while the edge of the leaf is purplish-red. These spots can extend and expand into blocks in the later stage, and finally the leaves dry up, which can lead to the death of the plant, which is what we often call the death of leaf dead seedlings.
Onset conditions
The disease is more common in spring and autumn. This time is warm and humid. Weather with frequent sunny and rainy weather is severe.
So how to prevent it
The first is to increase the ventilation and light transmission conditions in the field, and remove the diseased leaves in time when they are found, and bring them to the outside of the shed to destroy them, so as to reduce the source of infection.
The second is to strengthen field management, reasonable fertilization, and enhance the ability of plants to resist stress.
Third, the severely diseased fields should be rotated with other crops to reduce the number of pathogenic bacteria.
Fourth, the prevention and treatment of pesticides, in the early stage of the disease: 10% Shigao water-dispersible granules 1500 times, or 25% pyraclostrobin emulsifiable concentrate 1200-1500 times, or 40% phenylether-azoxystrobin suspension 1500-2000 times, or 50% iprodione wettable powder 600-800 times, or 25% azoxystrobin suspension 1000-1500 times, or 40% mycloconazole water-dispersible granules 6000-7000 times; Thiopanate-methyl wettable powder 1000-1500 times for control.
Use once every 7-10 days, noting that the agent should be used alternately.