The answer to your question is quite complex; different products are recommended for different fruit trees, and the timing is different, as well. Rather than try to list all the possibilities, here's a website with all the information on it. You can print the publication and keep it for future reference:
www.ca.uky.edu/HLA/Dunwell/IPMCalendar/IPMCalendar2004.html
Best wishes with your fruit trees!
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