Professional consulting and crop insurance were created for that. We don't have a minimum context. area?, rain?, acid soil?, market location?, variety? (early

Professional consulting and crop insurance were created for that. We don't have a minimum context. area?, rain?, acid soil?, market location?, variety? (early/season/late?), potential load of fruit? Without data, we can't suggest you anything of value Try the advice of an --independent-- professional consulting. Hear local sellers also but not only locals. Specially if they are local sellers also (Will try to sell you as many useless products as possible). Remember this: Chemicals are not a magic wand. Is the number one mistake of a newbie. Sometimes are useful, but incorrectly used can do more harm than good. If your plants get ill, first discover the real problem. Your plants are alive beings in the Family Rubiaceae, try to understand their ecological needs and fix those first. If you are newbie I would suggest to diversify your crops to reduce the possibility of failure. Some years are bad, other good. Do your location allows avocados? zapotes? icecream beans? plant a couple of trees somewhere to exercise your skills where they don't disturb the coffee plants or where they help them (If I remember correctly coffee plants need some light shadow to grow well, check it). Just an example, not need to be followed literally but, in resume, don't put all your eggs in the same basket.