6. Look at

the appearance of affected leaves. Dead leaves at the top of the tree

are usually the result of environmental or mechanical root stress. Twisted

or curled leaves may indicate viral infection, insect feeding, or exposure

to herbicides. The size and color of the foliage may tell a great deal

about the plant's condition.

7. Sometimes

a plants current problem is actually a result of something that happened

to it much earlier.

Disease.

Examples of infectious agents include fungi, viruses, and bacteria.

Noninfectious diseases, which account for 70 to 90 percent of all plant

problems in urban areas, can be caused by such factors as nutrient deficiencies,

temperature extremes, vandalism, pollutants, and fluctuations in moisture.

Insects.

Some insects can cause injury and damage to trees and shrubs. By defoliating

trees or sucking their sap, insects can retard plant growth. Insects may

also carry some plant diseases. In many cases, however, the insect problem

is secondary to problems brought on by a stress disorder or pathogen.

Treatment.

The treatment method used for a particular insect or disease problem will

depend on the species involved, the extent of the problem, and a variety

of other factors specific to the situation and local regulations. Always

consult a professional if you have any doubt about the nature of the problem

or proper treatment.

For more information

or assistance call the Georgia Forestry Commission at 770-254-7218.

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