Blueberries are a globally popular fruit with a promising future in cultivation. However, what causes blueberry leaves to turn black and wilt during cultivation? Let's find out below.
1. Overwatering
Blueberries have relatively stable water requirements, tolerating neither drought nor waterlogging. Overwatering can lead to waterlogged roots, hindering root respiration and nutrient absorption, causing leaves to turn black or soften. Therefore, proper watering is crucial for blueberries. Generally, keep the soil moist but not waterlogged, avoiding root problems caused by overwatering.
2. Unsuitable soil
Blueberry bushes prefer acidic soil, with an optimal pH level between 4.5 and 4.9. If the soil is too alkaline or acidic, it will impair the root system's absorption and transport functions, preventing the leaves from obtaining sufficient nutrients and oxygen, which may lead to symptoms such as blackening and wilting.
3. Excessive sunlight
Blueberry seedlings are intolerant of strong sunlight; if they get sunburned, the leaves may dry out and turn black. In this case, it's necessary to provide shade promptly, build a shade structure for the blueberry bushes, and prune the sunburned leaves appropriately to help them recover.
4. Nutritional deficiency
During the growth process, blueberries not only need macronutrients such as nitrogen, phosphorus, and potassium, but also micronutrients such as boron and magnesium. If the soil lacks micronutrients, or if the plant itself lacks them and cannot absorb them properly, it will affect its growth and lead to discoloration of the leaves.
5. Impact of pests and diseases
Blueberries are susceptible to various diseases and pests, such as fungi, bacteria, viruses, or insects. These diseases and pests can cause leaves to turn black and wilt. Diseases and pests should be identified and treated promptly, and appropriate pesticides should be used for prevention and control.
