Chlorosis: yellowing of normally green plant parts (to pale green, yellow, or almost blanched white). May or may not be in a pattern. Older leaves yellowing may be normal deterioration of age.

If yellowing is more pronounced between veins it is called “interveinal chlorosis.” In addition to nutritional problems, interveinal chlorosis may be due to soil pH problems, early heat and drought stress, and early stage of poor drainage.

Interveinal chlorosis of periwinkle

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Generalized Symptoms