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Genetic abnormalities,  such as chimeras, typically appear as variegations in leaf color; they are generally manifested as varying shades of yellow and green. Leaves may be entirely affected, only partially affected along defined lines, or a mixture of both. At first appearance, symptoms may be mistaken for a nutrient deficiency. However, occurrences of genetic abnormalities tend to be isolated, while nutrient deficiencies are generally more widespread in a planting.

Genetic abnormality (chimera).

(Photo: Howard F. Schwartz, Colorado State University, Bugwood.org)

Management:

• Chimeras cannot be prevented through grower practices, and they cannot be reversed once they develop.

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