June 12, 2026

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By Becky Wiepz and Dan Kielar

Station Updates

• Season is starting strong, despite spring frosts, the crops are looking good.

UW Madison/Extension Updates

• Wisconsin Fruit Crop Scouting Report: June 3, 2026
• Notes from the Field: A Grower’s Perspective – Erin Warner #3
• Apple Shoot Blight Management: What Should Wisconsin Growers Do Now?
• Petiole Sampling for Determining Fertilization Needs in Cold-Climate Grapes
• Protecting Grape Clusters During the Critical Pre-Bloom to Post-Bloom Period

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Historic Growing Degree Day Comparison

Date 6/11	2022	2023	2024	2025	2026	20-year avg.
Base 50	364	492.5	500	394.5	468	437

Recent Weather at Peninsular Ag Research Station

Date	Max Temp(℉)	Min Temp(℉)	Max Wind Gust(mph)	Daily Rain Total(in)
6/5	77.2	57.7	26.6	0.50
6/6	78.1	57.0	14.5	0.01
6/7	71.6	50.9	11.6	0.0
6/8	77.9	57.2	15.0	0.0
6/9	75.0	60.8	14.5	0.08
6/10	70.2	57.9	22.8	1.12
6/11	80.1	57.9	21.0	0.21
6/12	77.4	59.2	22.1	0.0

Apples

Growth Stage: Early fruit set.
Seasonal Update: Last applications of chemical thinning should be done now or hand thinning will be the only remaining option.

Pest	Southern Door	Central Door	Northern Door	Notes
Borer species	Present	Present	Present
Codling Moth	All blocks past biofix	All blocks past biofix	All blocks past biofix	1st generation sprays should go out with a follow-up spray 10-14 days later
Plum Curculio	No scarring observed yet	No scarring observed yet	No scarring observed yet	Controls should go out this week and in the following cover
Leaf rollers	Full flight	Full flight	Full flight	Red banded leaf rollers coming to an end and oblique banded leaf rollers at peak flight

Disease	Southern Door	Central Door	Northern Door	Notes
Apple Scab	None Detected	None Detected	None Detected	Check Apple Scab models on NEWA to time spray applications based on forecasts.
Fire Blight	Yes	None Detected	None Detected	Orchards should be monitored and strikes should be removed promptly, cutting 12-18 inches past the end of the canker.
Powdery Mildew	Yes	None Detected	Yes	More pressure with hot and humid weather in the forecast.

Cherries

Growth Stage: Fruit is out of the shuck.
Seasonal Update: Pro-Gibb application to encourage return bloom should be applied 14-28 days after full bloom.

Pest	Southern Door	Central Door	Northern Door	Notes
Spotted Wing Drosophila	Yes	Yes	Yes	Fruit is not vulnerable yet but models should be utilized to time insecticide as soon as necessary since adults are present throughout the county. When possible, save effective chemistries for SWD applications closer to harvest.
Plum Curculio	None Detected	None Detected	None Detected	Scout for egg laying scars on fruit, especially near wooded areas.
Borer species	Adults Caught	Adults Caught	Adults Caught	Targeted sprays should go out 7-10 days after first catch followed by a second application 10-14 days later.
European Red Mites				Scouting starts soon to monitor population build up.

Disease	Southern Door	Central Door	Northern Door	Notes
Cherry Leaf Spot	None Detected	None Detected	Yes	Early season dry weather has kept pressure minimal but risk is increasing with leaf expansion and rain events.
Powdery Mildew	None Detected	None Detected	None Detected	Early season dry weather has kept pressure minimal but more pressure is expected with hot and humid weather in the forecast.

GRAPES

Growth Stage: E-L Growth Stage 18
Seasonal Update: Fungicides should be applied around bloom to protect your fruit through harvest.

Pest	Station	Notes
Leaf Hoppers	Yes
Phylloxera	Some galls observed
Red Banded Leaf Rollers	Yes

Disease	Station	Notes
Black Rot	Single Lesions Observed	Early season fungal control is critical to prevent diseases from reaching economically damaging levels.
Powdery Mildew	None Detected	Risk will increase with current heat and humidity. Scout your orchard to determine local pressure.
Downey Mildew	None Detected	Risk will increase with current heat and humidity. Scout your orchard to determine local pressure.

Additional Resources

• Gibberellic Acid Applications in Cherries
• Financial Decisions for Tart Cherry Crops with Variable Yields
• Take Steps To Ensure That You’re Complying With the EPA Herbicide Strategy To Protect Threatened and Endangered Species