Mweather hale michign6/30/2023 Apples at pink stage in Romeo, May 1, 2023. This article from 2022, “ Honeycrisp crop management for 2022,” outlines some steps you can take (this was written with high-density Honeycrisp in mind). It is also time to prepare for whether and how you may want to treat your trees during bloom for crop load management, thinning and ensuring return bloom. At the full pink stage, they are 28 F for 10% kill and 25 F for 90% kill. Critical temperatures for apples at tight cluster are 27 degrees Fahrenheit for 10% kill and 21 F for 90% kill. RimPro is currently reporting a lingering risk of a scab infection through the next day of continued rain and potentially again around May 10. Further north in Fenton and Romeo, MI, on Monday the apples were primarily pink with some varieties lagging behind in tight cluster. Fruit-by-fruit conditionsĪpples: We have not moved much in our growing degree day (GDD) accumulation, no blooms have been reported yet in southeast Michigan, but some cultivars are flowering in the southwest. See the latest weekly fruit meetings for Southern Michigan on MSU’s Kaltura Mediaspace (these may take a few days to upload after the Monday meetings). It is a good opportunity to ask questions and receive RUP credits. I encourage our growers to attend the weekly southern Michigan grower meetings virtually on Monday evenings by registering online. With apple bloom imminent this is a good chance to review this 2022 article on reducing pesticide risks to bees during fruit crop bloom. I will be setting up traps for the southeast Michigan trap line in the next week. Not much insect movement has happened in the last week because of the cool temperatures. The risk of economic loss due to scab is highest early in the season because it is a disease that will recur and intensify with successive generations. Based on the RimPro models at the Romeo station, we are expecting continued potential for apple scab infection through Thursday (May 4) and a potential spike in infection risk around May 10. The continued chance of rain means that disease risk will still be present. We expect another two days of rain and cool weather, but we are expected warmer and drier conditions later in the week. We continue to see blossoms in cherries, peaches and plums in some parts of the region. Despite freezing temperatures last week, I haven’t seen much damage on my site visits nor have growers reported much to me. General observationsĭue to the cold weather we have had in the last couple weeks, we haven’t seen much movement in our fruit crops’ bud development. Throughout the season these updates will include information about the weather in the past week and the upcoming week, a fruit-by-fruit guide to current conditions with appropriate pest and disease updates, and other relevant observations. Welcome to the fourth in-season fruit article update for southeast Michigan for the 2023 season.
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