2011 Season - NOTHING!
We started 2010 with hard pruning of about 75% of our trees, to increase light and air flow.
Our organic spray program was adapted from a 2001 paper from a Michigan State Horticulture Extension Office.
We sprayed Copper Sulfate and Oil before bloom to kill off overwintering eggs and discourage bacteria and fungi.
Late April - Now spreading 120 tons of lime. A little late, but our hi-loader broke, and doing it by hand was not realistic. Next, spread 19-19-19, also late.
Petal fall - weather is cold and miserable. And we're adding electric valves to the sprayer, so we can only spray the trees and not every break and empty spot in between. With these two factors, we delay our petal drop spray until well after petal drop. We survey the fields looking for moth eggs and other nasties.
OK, it's late May and we're ready to spray again - Lime, Sulfur, Boron, BT, and 20-20-20 fertilizer. So far, the crop looks good. Praise God!
Weed Control?? Organic weed control thus far does not appear to be highly developed, so we are employing mowers, weed whackers and pruners. Costly time-wise, but no weed can develop a resistence to a flying blade or string, and no chemicals are being used!