Northwest berry Foundation

Management Detail

Leaf Scorch

in Strawberries

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Latin name: Diplocarpon earlianum (asexual: Marssonia fragariae)

Description:

Small, dark purple spots develop on upper leaf surfaces and remain dark purple. A white center never forms, as with common leaf spot. Spots have an irregular outline. If numerous, spots run together, and leaves appear scorched. In severe cases, foliage is reduced considerably, and plants may be stunted. Infected fruit has elongated, slightly sunken, reddish areas or streaks, but the marks disappear as the fruit ripens.

Links:

Scouting:

  • Small, dark purple spots develop on upper leaf surfaces and remain dark purple.
  • A white center never forms, as with common leaf spot.
  • If numerous, spots run together, and leaves appear scorched.
  • Infected fruit has elongated, slightly sunken, reddish areas or streaks, but the marks disappear as the fruit ripens.

 
Cultural Controls:

  • Cultivars differ greatly in their resistance to Leaf Scorch. If it is a serious problem, use a more resistant cultivar.
  • Don't use too much nitrogen fertilizer. It can cause soft, succulent foliage that is more susceptible to Leaf Scorch.
  • Allow good air circulation for optimum drying by spacing plats appropriately and keeping weeds under control.

 

For information about chemical controls, check with our Pesticide Guide.

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