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Summer drying injury

Summer  drying injury - Necrosis on a leaf
  • Latin name: Siccitas aestiva Nature
  • French name: Dessication estivale
  • Division: Intemperiae
  • Class: Température élevée





Damage, symptoms and biology

When drought conditions affect the soil and high transpiration occurs owing to wind and heat conditions, trees undergo partial dehydration and exhibit symptoms linked to summer drought. The upper portions of the tree become dehydrated more rapidly, and this often permits the penetration of air into the sap conducting system. This results in an irreversible air bubble that stops the flow of sap in the affected vessel elements. This is referred to as a summer embolism. If the embolism is severe, the leaves will no longer be supplied with sap and they will wilt, dry out, turn brown and may drop prematurely. In some cases, young trees may succumb to the drought.

Other information

The symptoms associated with summer drought can be confused with those of anthracnose, a fungal disease of foliage.

Canadian Forest Service Publications

Summer drying injury

Information on host(s)

Main host(s)

Conifer, deciduous


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