Many plant diseases are described as yellowing, although the color can be open to interpretation. If the streaks are truly more light brown or tan, and you don't see any spotting or scabbing or lesions, the leaves could possibly be getting sunburned. This article has more information on possible disease: https://www.gardeningknowhow.com/edible/vegetables/eggplant/eggplants-turning-yellow.htm
Answered on September 9, 2014
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