By Becky Wiepz and Dan Kielar
Apple harvest has started throughout the county!
This week Zestar, Rave, SweeTango, Paula Reds, and early McIntosh varieties are ripe, among others. In the next week or so we should start to see some of the early Honeycrisp and Cortland varieties.
This will be the last PARS Pest Update of 2022. For up-to-date fruit maturity data please reach out to email@example.com.
GDD Base 50 continues to be 7-10 days behind the 20-year average.
|Date 8/23||2018||2019||2020||2021||2022||20-year avg.|
Pre-harvest plant growth regulators should be applied now. Depending on management strategy and variety, Retain and NAA can be applied 30 or 14 days before harvest to manipulate ripening speed and prevent fruit drop. This article from MSU goes into more detail on the use of both chemicals.
Codling Moth and Apple Maggot continue to fly in the county, and Stinkbugs and Tarnished Plant Bugs are being trapped in relatively high volumes in many orchards.
American Plum Borers were caught in low numbers this week.
An additional pre-harvest spray may be warranted due to high insect numbers.
Fire blight is less of a concern now as most branches have set their terminal buds; however, keep note of orchards that experienced heavy pressure this year in order to monitor for cankers in the spring.
Including Pristine or Merivon in your final pre-harvest application will aid in late-season disease prevention as well as post-harvest disease control. Scout your orchard and monitor the Enviroweather model to track your level of risk.
Now is a good time of year for hedging and pruning your trees to open the canopy. It’s also an excellent time to review your spray program and assess its impacts while the season is still fresh in your mind.
Many orchards have few or no active lesions at this time; therefore, if the rain holds off, a single post-harvest spray for cherry leaf spot may be sufficient this year.
Marquette continues to progress through veraison and would benefit from bird protection. Exclusion netting and bird distress callers are generally effective and will be used at the Research Station.
For information on grape and apple maturity at the Research Station, please reach out to firstname.lastname@example.org
For more detailed phenology information visit Wisconsin Fruit NewsThis article was posted in Fruit Pest Updates.