I ordered some 100% purity Neem oil online. When I get it , the advice I found was to dilute the pure Neem oil 1 to 4 (by volume,not weight , right?) and spray the leaves til saturated, but not before exposure to bright sun. Here that definitely means evening so it can dry overnight before the intense daytime sun which starts early. Does that sound correct? How many times or how often do you expect I will have to do this-just once? 
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