water-soaked spots on chrysanthemum petals and leaves. First symptoms usually
are on outer, older florets. Later, a powdery grayish brown mass of fungal
spores covers affected parts. Lower senescent leaves may rot, and if the fungus
gets into the stem, it may girdle the stem.
COMMENTS on disease
fungus survives in plant debris as sclerotia. Spores spread by overhead
irrigation and by air, favored by high humidity and temperatures of 50°F to
70°F. Warm days followed by cool nights encourages condensation on flowers
which favors disease development. Wounded or senescent tissue is most likely to
- Provide good air circulation-space plants
- Remove and destroy affected leaves as soon
as noticed. Dispose of all plant debris promptly.
- Avoid overhead watering.
as a foliar spray in conjunction with cultural control methods. Tank-mix and/or
alternate products from different groups with different modes of action to
prevent the buildup of resistant fungi.
- AllBan Flo
- BonideCaptan 50 WP
- Bonide Fung-onil Multi-purpose Fungicide
- Botran 75W
- Captan 50 WP Chipco 26019
- Daconil Weather Stik
- Decree 50 WDG
- Hi Yield Captan 50 W