Strawberry virus disease

Strawberry virus disease is an important disease in strawberry production. Viral diseases have the property of latent infection. Plants cannot express symptoms quickly, so production is often overlooked. According to the survey, mildly ill strains generally reduced production by 21% to 25%, and heavy virus strains (more than two viral infections) generally reduced production by 43% to 59%.

Symptoms: Strawberry is infected by a single virus, but the symptoms are not obvious. After being infected by the complexes, the main symptoms are growing weak and degenerating. The new leaves are not fully developed, and some of the leaves are dull, yellowish, and distorted. The plants are dwarfed, with few fruit set and fruit yields. Viruses that infect strawberry are commonly found in the following four types.

Strawberry mottle virus The virus is very widely distributed and there are strawberry cultivation sites. Almost all of the virus diseases occur. When infected alone, the strawberry has no obvious symptoms. When combined with other viruses, the strawberry plants can be severely dwarfed, the leaves become smaller, and the chlorotic spots appear, and the leaves shrink and twist.

Strawberry light yellow edge virus When the virus is infected with the virus alone, the strawberry plants are slightly dwarfed. When the combined infection causes yellowing or chlorosis of the leaves, the old leaves turn red, the plants dwarf, the leaf margins roll up irregularly, and the leaf veins fall Bend or full leaf twist.

There was no obvious symptom when strawberry mosaic virus alone invaded. After compound infection, the veins were shrinking and the leaves were twisted. At the same time, yellow-white or purple spots were formed along the veins. The petiole also had purple spots, and the plants were extremely dwarfed. Decrease, yield and quality decline.

?? Strawberry Shrinkage Virus This virus is distributed worldwide and is the virus most harmful to our country's strawberries. Virus strains infecting strawberries can cause dwarfing of strawberry plants, irregular yellow spots on the leaves, distorted deformation, reduced number of stolons, reduced reproduction rate, and smaller fruit; when planted with mottle virus, the plants are severely dwarfed. , and then combined with the light yellow edge virus three infections, will lead to a significant reduction in strawberry production, or even out of production.

China's strawberry varieties are mostly imported from Europe, North America, Japan and other places, where yellow-type virus disease often occurs on strawberries in these regions. Among them, strawberry green valve disease and aster yellowing disease are devastating virus diseases of strawberry and should be prevented from being introduced. The two virus diseases are mainly transmitted by leafhoppers. Generally, the plants die within two months of symptoms and die shortly after the infected seedlings colonize. The main symptom of greenvale disease is that the petal turns green, and a few petal petals are often connected. Together, the greenish petals turn red later. The berry is thin and tapered, the edges of the leaves turn yellow, and the plants are dwarfed and clustered. Green valve disease can also be transmitted through soy bean dodder and can harm clover and other plants. In addition, there are some virus-like diseases, such as witches'broom disease, which have been found in our country but have a narrow distribution.

?? Strawberry virus disease is not only species, and other plant viruses, such as Raspberry ring spot virus, tobacco necrosis virus, tomato ring spot virus, etc., can also infect strawberries, and cause harm. About 20 species of locusts spread strawberry viruses. The virus is harmed by the virus, which generally reduces production by about 30%, and the loss is even greater when the compound infects.

Prevention and control methods?? Control strawberry virus disease, the first use of virus-free strawberry seedlings; soilless cultivation, or before strawberry colonization with methyl bromide fumigation soil disinfection; control of aphids.

The key is to use virus-free strains.

1, timely control of aphids, reduce the re-infection of the virus.

2. Regularly update the strawberry varieties and use resistant varieties.

3. Avoid continuous cropping and intercropping with Solanaceae crops that are susceptible to viral disease.

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