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Problems involving trees, shrubs, and ground covers

Photo courtesy of Larry Costello.

Symptoms: Shoots on southwest side of this coast redwood tree are severely "burned."

Diagnosis: The new growth was burned during a heat wave in which daily temperatures repeatedly exceeded 90oF.

Solutions: Certain species are particularly sensitive to sunburn. Allow the tree to recover and then prune away dead portions.

Photo courtesy of Larry Costello.

Symptoms: Growing tips of rhododendron bush are reddish brown and necrotic.

Diagnosis: This sunburn resulted from afternoon sun exposure when temperatures exceeded 90 oF.

Solutions: Rhododendron is a shade-loving plant and should not be planted in sunny, hot locations.

Photo courtesy of Raabe.

Symptoms: Yellowing of leaves on camellia bush.

Diagnosis: Camellia was exposed to excess sunlight.

Solutions: Camellia is a shade-loving plant and should not be planted in sunny, hot locations.

Photo courtesy of Larry Costello.

Symptoms: Dwarf periwinkle appears "burned."

Diagnosis: Injuries are the result of high light intensity.

Solutions: Provide shading, perhaps with other closely-planted bushes. Periwinkle cannot tolerate high light intensity.

Photo courtesy of Larry Costello.

Symptoms: Bark is injured on the trunk of this Chinese pistache.

Diagnosis: The damages are from sunscald. Sunburn and sunscald symptoms are similar.

Solutions: Sunscald and sunburn injuries on young trunks can be prevented by applying white interior latex paint diluted 50% with water.

Photo courtesy of Larry Costello.

Symptoms: Drying, cracking, and bark fallout on ash tree in parking lot.

Diagnosis: The injuries on the southwest side of the trunk are due to sunburn.

Solutions: Sunburn injuries on young trunks can be prevented by applying white interior latex paint diluted 50% with water.