Treatment Plan

*Please Note: Black rot symptoms can easily be confused with anthracnose symptoms. Review of both factsheets is encouraged to confirm your diagnosis.

Cultural practices used to reduce the incidence of anthracnose include planting varieties less susceptible to the disease, increasing air circulation in the vineyard, eliminating wild grapevines on hedgerows and near the vineyard, pruning and removing diseased canes from the vineyard during the dormant season, and covering diseased berries with soil by cultivation or with mulch.

Where control is needed, fungicides should be applied beginning as early as 1” shoot growth. Once infections have occurred the disease can continue to spread throughout the growing season.

Although not specifically labeled for control of anthracnose, mancozeb products (Dithane F-45 Rainshield, Manzate Pro-Stick Fungicide), captan products (Captan 50 Wettable Powder, Captan 80WDG, Captec 4L) and Ziram 76DF Fungicide applied according to label directions to control Phomopsis, black rot, and downy mildew are likely to provide adequate control of anthracnose as well. Refer to the treatment plan for control of phomopsis, black rot, and downy mildew when control of anthracnose is also needed.

The sterol inhibitor (Resistance Group Number 3) fungicides Rally 40WSP, Mettle 125ME Fungicide, and Revus Top are registered for control of anthracnose, but the total number of sterol inhibitor sprays should be limited to a maximum of three per year to delay or prevent the development of powdery mildew resistance to this group of fungicides. Mettle (active ingredient tetraconazole) can be applied as early as 1” shoot growth at 3 to 5 fl oz per acre with a maximum of 3 applications and 10 fl oz per season. Rally can be applied as early as 1” shoot growth at 3 to 5 oz per acre and can be applied up to 1.5 lb per season. Revus Top can be applied as early as 1” shoot growth at 7 fl oz per acre and up to 28 fl oz per season, making no more than 2 sequential applications before alternating to a fungicide with a different mode of action.  Do not use Revus Top on Concord, Concord Seedless, and Thomcord (causes injury). 14 day PHI, 24 hr REI for Rally 40WSP; 14 day PHI, 12 hr REI for Mettle 125ME Fungicide and Revus Top.

The strobIlurin fungicide Pristine Fungicide (Resistance Group 11) is registered for control of anthracnose with applications beginning prior to the onset of disease. Powdery mildew and downy mildew resistance to the strobIlurin fungicides has occurred in many vineyards following several years of repeated use. It is highly recommended that the combined use of all strobIlurin fungicides including Sovran and Pristine be limited to no more than 2 applications per season and rotated or alternated with unrelated fungicides. If the strobIlurin fungicides are included in effective management programs for powdery mildew and downy mildew, their use should be saved for the immediate pre-bloom or later sprays. For anthracnose control, apply Pristine at 8-12.5 oz per acre. Do not use Pristine on Concord or Noiret as it causes injury. Use with caution on Steuben, Rougeon, Worden, Fredonia, Niagara and related varieties where injury has occurred irregularly. 14 day PHI, 12 hr/5 day REI – see label for details.