Plant leaves turning white is often the first, and sometimes the only sign, of leaf sunscald in plants, so think of this problem as plant sunburn damage and you won’t be far off from the truth. Sunscald injury of plants is easy to prevent, though there is no cure. All you can do is support the plant until it manages to grow new, stronger leaves and slower acclimation to bright sun, known as hardening off, is vital to promoting sun-resistant leaf development and preventing plant sunburn damage. Another way is by using a sunshade to restrict their exposure to UV light and it's by slowly giving them more time each day with the sunshade removed until they are toughened up.

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Source: Gardening Know How