What are the common diseases and insect pests of blueberries? What are the prevention and control methods?

Blueberry has high nutritional value and health care value, and has been loved by many people. with the continuous increase of planting area in recent years, many fruit growers have begun to plant blueberries, so what are the common diseases and insect pests of blueberries? What are the prevention and control methods?

1. Blueberry scorch virus

The virus can cause the death of leaves and flowers, different varieties have slightly different resistance to the disease, the main symptoms of the damaged plants are in the early spring florescence, mainly flower wilt, and a small amount of death, the visual table of the leaf edge of the old leaf. With the growth of plants, some varieties will have continuous branch death, and some varieties with poor disease resistance will often show that most of the leaves die, and the plants will die within 3-6 years, and some varieties with strong disease resistance only show the symptoms of leaf chlorosis.

Prevention and control methods: the best way to prevent is now virus-free seedling colonization, planting should pay attention to the vicinity of such improper, once found that the plant is damaged, should immediately remove burning, at the same time to strictly control aphids.

2. Leaf spot of blueberry

So far, the occurrence area of the disease is less, but once the disease is extremely harmful, the plant stem dies until the whole plant dies for several years. Different varieties have different disease resistance and different symptoms. Some of the injured 5-6 years showed perennial stem death, the new branches were short and deformed, and the leaves were spotted; some varieties showed lighter stem death, but the tree growth was short, and the leaves were small and yellowish green due to the shortening of internodes.

Prevention and treatment: the disease is mainly spread by the pollination activities of bees and bumblebees, which can cut off the route of transmission, but the best way is to remove the diseased plants.

3. Mosaic disease

Mosaic disease is also a common disease in blueberry production, which can reduce the yield by more than 15%. The main symptoms are that the leaves turn yellow and green and appear spots or annular scorch, sometimes purple spots, and the symptoms are different in different years. The symptoms are serious in one year, but not in the next year.

Control methods: the disease mainly depends on aphids and virus-carrying seedlings to spread, so the use of insecticides to control aphids and cultivate virus-free seedlings can effectively control the occurrence of the disease.

Fourth, red wheel spot disease

The disease is one of the most common diseases in blueberry producing areas in the United States. once the disease occurs, it can cause at least 1/4 yield loss. The disease is caused by the fact that the branches and leaves often show green wheel-shaped red spots in the middle, and in the high temperature season, the upper half of the old leaves will also show this symptom.

Prevention and control methods: the disease is mainly spread by pink scale, another way is to spread by virus-carrying seedlings, the main way of control is to use virus-free seedlings and control pink scale.