Leaf curl can be a sign of several issues affecting a plant's health. Here's a breakdown of the common causes:
Water Stress: Both under-watering and over-watering can cause leaves to curl. Under-watering leads to dehydration, while over-watering can suffocate the roots, preventing them from absorbing water properly.
Heat Stress: Excessive heat can cause leaves to curl upwards to reduce their surface area exposed to the sun, minimizing water loss through transpiration.
Pest Infestation: Pests like aphids, spider mites, and whiteflies suck sap from leaves, which can lead to curling, discoloration, and distortion.
Viral or Fungal Infections: Certain plant viruses and fungal diseases can cause leaves to curl, often accompanied by other symptoms like spots or lesions.
Nutrient Imbalance: Deficiencies or excesses of essential nutrients like calcium, magnesium, or nitrogen can cause leaf curling.
Herbicide Damage: Exposure to herbicides can cause distorted growth, including leaf curling.
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