Been battling black rot for years now and can’t get it under control. Wind up losing half or more of my grapes. My current spray program- Western Pennsylvania May 15, Captan (dry) .4 oz/ gal. May 29, Daconcil (liq) 2 tbs./ gal. June 6, Captan .5 oz per gal. June 15, Daconcil 2 tbs. / gal. Black Rot appears. June 17, Captan 1.0 ounce/ gal. I spray top, bottom, in/out/up/down and spray leaves and clusters. We have rain virtually everyday and humidity. I even trim back vines to keep it open for air to circulate under. Vines are Brianna, two wire. Any help is appreciated.