Symptoms and Signs
While Botrytis cinerea is capable of colonizing damaged artichoke leaves, the main concern with this fungus is when it gets on the flower bracts. This fungus usually invades bracts that have been damaged from insects, snails or slugs, frost, or other factors. Infected bracts turn brown on the outside. On the inner surface of the bracts the characteristic gray growth of B. cinerea develops.
Comments on the Disease
The fungus survives on decaying organic matter in and around artichoke fields. Senescent leaves may also support the growth of this fungus. Botrytis rot is typically more severe following periods of wet, rainy weather. This disease is also a postharvest concern because damaged or improperly handled artichoke buds can develop symptoms in storage.
Management
Protect plant buds from damage caused by insects and other invertebrates. Handle harvested buds properly.
| Common name | Amount per acre | REI‡ | PHI‡ | |
|---|---|---|---|---|
| (Example trade name) | (hours) | (days) | ||
| Not all registered pesticides are listed. The following are ranked with the pesticides having the greatest IPM value listed first—the most effective and least likely to cause resistance are at the top of the table. When choosing a pesticide, consider information relating to the pesticide's properties and application timing, honey bees, and environmental impact. Always read the label of the product being used. | ||||
| A. | PYRACLOSTROBIN/BOSCALID | |||
| (Pristine) | 18.5–23 oz | 12 | 0 | |
| MODE-OF-ACTION GROUP NAME (NUMBER1): Quinone-outside inhibitor (11)/succinate-dehydrogenase inhibitor (7) | ||||
| B. | FLUOPYRAM/TRIFLOXYSTROBIN | |||
| (Luna Sensation) | 7.6 fl oz | 12 | 0 | |
| MODE-OF-ACTION GROUP NAME (NUMBER1): Succinate-dehydrogenase inhibitor (7)/quinone-outside inhibitor (11) | ||||
| ‡ | Restricted entry interval (REI) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (PHI) is the number of days from treatment to harvest. In some cases, the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest. |
| 1 | Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action. Fungicides with a different group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-action group numbers 1, 4, 9, 11, or 17 before rotating to a fungicide with a different mode-of-action group number; for fungicides with other group numbers, make no more than two consecutive applications before rotating to a fungicide with a different mode-of-action group number. |