2022 Disease Update: Consider Fungicide Applications Ahead of Hurricane Ian Remnants

The forecast is still in flux, but it may be persistently wet from October 1–3. Growers are in harvest mode, and the last fungicide spray may have been several weeks ago or longer. Consequently, fruit may be going into this significant wetting period unprotected. Fruits are still susceptible to fruit rots, sooty blotch, and flyspeck, especially for late-season varieties. Considering the potential forecast, growers are strongly encouraged to apply a fungicide spray this week. This is especially important for later harvested varieties and varieties intended to be kept in long-term storage.

Fungicides to consider during this time are Merivon (FRAC Groups 7 + 11; 0-day PHI), Luna Sensation (FRAC Groups 7 + 11; 14-day PHI), and Flint Extra (FRAC Group 11; 14-day PHI), as these are the best options as preharvest fungicides that offer residual activity and are strong against fruit rots. These fungicides control most rots, such as bitter rot, white rot, black rot, and Alternaria rot, that growers in the Mid-Atlantic may encounter late in the season or may creep up during postharvest storage. Captan is also another excellent fungicide but is easily washed off. Be mindful of how much rain falls in your region this weekend.

Commercial fruit growers, please note

When controlling for disease, weather and tree growth conditions need to be monitored at a local level within one's own orchard. To assist with management decisions (especially infection events), growers can use the NEWA website, which has weather stations all over Pennsylvania. Before chemical products are applied, be sure to comply by obtaining the current usage regulations and examining the product label. Product information can be easily obtained from CDMS.