Latest Causes and Solutions for Yellowing and Drying Blueberry Leaves

Blueberry leaves are important organs that blueberries use for photosynthesis to synthesize organic matter, and once a large number of leaves turn yellow, it will seriously affect the growth and development of blueberries. The yellow-leaf phenomenon in blueberries is quite serious; in mild cases it leads to a low fruit-setting rate, and in severe cases it causes tree decline, dead branches and leaves, and even dead plants. To prevent and control yellow leaves in blueberries, you must first understand the causes. Let us take a detailed look below.

1. Causes of Yellow Leaves in Blueberries

1. Seedling causes

When the seedlings themselves are malnourished and have poor root systems, and during planting the root ball is not broken apart or the soil is hilled too thickly over the roots, root growth will be poor and yellowing will occur.

2. Improper soil

Blueberries have strict requirements for soil pH. The suitable growing soil is between pH 4.5-5.5; too acidic or too alkaline is unfavorable to the growth and development of blueberries. In addition, when the soil organic matter content does not reach 5% or above, it is also unfavorable to blueberry growth.

3. Waterlogging

Plots in low-lying areas that easily accumulate water are highly prone to waterlogging, which seriously affects the growth and development of the blueberry root system and its ability to absorb nutrients. Over time, the leaves do not get enough nutrients and water, and yellowing occurs.

4. Underground pests

Pests such as white grubs and mole crickets damage the blueberry root system, causing root damage and tree decline. In addition, root rot and stem base rot can also cause plants to grow slowly, fail to produce new branches, fail to unfold heart leaves, and even the leaves that emerge are relatively small, with yellowing occurring.

5. Fertilizer burn: Blueberries are a low-fertility crop. Applying too much fertilizer or placing fertilizer improperly and causing fertilizer burn can also easily lead to yellowing in blueberries.

2. Solutions

1. Seedlings and new branches

Choose healthy 2-3 year old seedlings with well-developed root systems and 2-3 branches. When planting, first break open the root ball; if the root ball is relatively dry, transplant while soaking in water.

2. Soil improvement

Measure the soil pH before planting, apply sulfur powder or humic acid to adjust acidity and alkalinity, and apply organic microbial fertilizer or forest peat for localized soil improvement to increase soil organic matter.

3. Ridge cultivation

Drainage ditches can be built properly. This can effectively reduce the occurrence of waterlogging and avoid blueberry yellowing caused by waterlogging.

4. Pest and disease control

For leaf yellowing caused by root damage from various pests and diseases, you can drench the roots with humic acid foliar fertilizer + 30% hymexazol + carbendazim + low-toxicity insecticide + plant growth auxin, achieving the triple effects of sterilization, insect killing, and root promotion.

5. Foliar fertilization

Foliar fertilization has the characteristics of high absorption and utilization rate and quick recovery, so in the early stage of yellowing you can spray the leaves with fungicide + trace element water-soluble fertilizer to supplement medium and trace elements, so that the leaves that have already turned yellow gradually turn green again.

  The above is an introduction to the causes and solutions for yellowing and drying blueberry leaves. We hope it can help you. If you want to learn more related knowledge, please follow us,