WHAT IS HAPPENING

WHEN THE LEAVES OF STRAWBERRIES TURN YELLOW OR BROWN

WITH SPOTS?


If the leaves appear abnormal in color, it may be caused by physiological disorders and element deficiencies in strawberries. The occurrence of physiological disorders in strawberries is closely related to fertilization management. In addition to the basic nutrients of nitrogen, phosphorus, and potassium, through foliar fertilization can quickly replenish the needed moderate elements(calcium, magnesium) and trace elements (boron, manganese, zinc, iron, etc.) to plants at different growth stages.

 

The following are common physiological disorders in strawberries when element deficiencies:

  1. Nitrogen deficiency: Yellowing of leaves, poor development of entire plant. Red-brown or rust-colored spots appear on the leaves edge and plant stem.
  2. Phosphorus deficiency: Leaves turn to dark green color, poor development of the plant.
  3. Potassium deficiency: Symptoms of mottled or yellow spots appearing on old leaves, followed by necrosis on the leaf margin or spots between leaf veins.
  4. Calcium deficiency: Leaves become deformed, curls as a cup shape, and leaf tips die. Fruits are small and the density of strawberry seeds on the surface is high.
  5. Magnesium deficiency: Leaves turn wither and curling on the edges, leaves turn yellowing. The leaf base and new leaves remain green.
  6. Iron deficiency: Yellowing appears on new leaves and calyx, but veins remain dark green. In severe cases, the entire leaves turn brown then die.
  7. Boron deficiency: Yellowing appears on older leaves and edges, new leaves in dark green but die on the leaf tip. Poor development of fruits, uneven fruit size and soft texture. Have negative effects on lateral buds, appearing short and thick. 

It is recommended to supplement the necessary macronutrients and micronutrient through foliar fertilization at different growth stages of strawberries, which can reduce the probability of physiological disorders and element deficiencies.

Referrence:

1. Lawrence Ullio. (2010). Strawberry fertiliser guide. Primefact, 941.

2. Lieten, F. and Misotten, C. (1993). NUTRIENT UPTAKE OF STRAWBERRY PLANTS (CV. ELSANTA) GROWN ON SUBSTRATE. Acta Hortic. 348, 299-306.