Eggplant

Question

What is the cause and solution of white colour on the leaves?

Answer 1

If you see a white, powder-like substance on the leaves, this is powdery mildew. Please see these articles for help:

http://mgorange.ucanr.edu/Edible_Plants/?ds=530&uid=96
https://www.gardeningknowhow.com/edible/vegetables/squash/powdery-mildew-in-squash.htm

If instead the leaves are turning pale green/yellow and then almost white, this could be sunburn or a nutrient deficiency. See this article:

https://www.gardeningknowhow.com/edible/vegetables/eggplant/eggplants-turning-yellow.htm