Gray Mold (Botrytis cinerea)
Botrytis cinerea is most problematic under wet conditions and as a secondary pathogen. Infected bracts will typically develop sunken brown or black lesions, with characteristic fuzzy, gray mold sometimes developing on the inside of bracts. Remove infected plant material and space plants further apart in future seasons to mitigate incidence of gray mold. Preventing insect feeding damage and other wounds can help mitigate the effect and spread of gray mold.
FRAC Group 7:
- pyraclostrobin + boscalid (Pristine): 18.5 to 23 oz/A; PHI 0d, REI 12h; Groups 11 & 7. Do not apply as a tank-mix and do not make more than 3 applications per year.
FRAC Group 11:
- pyraclostrobin + boscalid (Pristine): 18.5 to 23 oz/A; PHI 0d, REI 12h; Groups 11 & 7. Do not apply as a tank-mix and do not make more than 3 applications per year.
FRAC Group 19:
- polyoxin D zinc salt (Oso 5% SCOG): 6.5 to 13 fl oz/A; PHI 0d, REI 4h. Apply as foliar spray in sufficient water to achieve thorough coverage.
FRAC Group NC:
- hydrogen peroxide + peroxyacetic acid (Oxidate 2.0OG): 1:100 dilution (curative) or 1:200 to 1:400 dilution (preventative); PHI 0d, REI until sprays dry (field), 1h fogging/spraying or 0h other methods (enclosed areas). Do not tank-mix with copper.
Verticillium Wilt (Verticillium dahliae)
The same strain of Verticillium wilt that affects strawberries and lettuce can also infect artichoke. Because this disease spreads through plants’ vasculature, symptoms often appear on only one side of stems or leaves. Wilting, yellowing, browning, and/or stunting may be observed. The vascular system in the lower stem may turn dark brown. Avoid rotating artichokes with strawberries and lettuce.