I grow Concord grapes for Welch's as our "cash" crop, (the corn, beans, hay and beef cows are just a hobby). At this point, we have sprayed four separate times for diseases/mildew and once for insects, much of the best performing tools are restricted use pesticides (must be licensed to buy and apply). While nothing completely eliminates any of the pests, Sevin is usually effective for Jap beetle, readily available, and not super-toxic to others. Many of the proven disease-fighters are zinc or copper based. Timing is usually everything- Grape Berry moth is far more damaging to the commercial vineyards here, but we now understand their growing-degree-day driven reproduction cycle and can spray to disrupt it. With a small patch, you can spray more to respond to observed pests than we can- scouting is important.
Biggest challenge many home-growers face is the dormant pruning of the vines- much more plant growth is removed for top-quality fruit production than you would ever think the plant could want. Many homeowners also seek a specific form to their canopy- trellis/arbor style. Here (SWMI) we retain 150-250 buds per plant in one or two popular trimming styles, which often results in pruning off 400-500 extra buds. Cornell and MSU publish quite a bit of recommended reading for growers, and your local extension agent should have a fruit growers guide for spray suggestions.
Like many other things, careers have been spent learning how to grow good grapes for a variety of end products, way too much for one post!
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