Grape Scouting Reports

MSU's grape team will be scouting vineyards and reporting the results through our grape scouting reports. MSU staff, educators and specialists in southwest and northwest Michigan will visit multiple vineyards, check growth stages, monitor traps and sample leaves and clusters. These reports will cover weather, grape phenology, disease and insect information and serve as a platform for us to announce meetings. These reports will be posted on Wednesdays every week throughout the growing season. We will add additional reports as specific issues come up through the season.

The free scouting reports will be included in MSU Extension’s News for the Grape & Wine Industry e-newsletter. If you are not already receiving MSU Extension News, you can sign up by entering your email address with MSU Extension News, then scroll down the list and click the box to select “Grape & Wine industry.” You can also click to select additional topics for other e-newsletters that may be relevant for you.

Michigan grape scouting report – September 6, 2023

Published on September 6, 2023
It's time for harvest, and growers are looking forward to a bountiful yield.
Michigan grape scouting report – August 30, 2023

Published on August 30, 2023
As September approaches, Michigan grape growers must focus on disease and bird management to protect their clusters. Sour rot is a major concern, and growers should be vigilant in their scouting efforts.
Michigan grape scouting report – August 22, 2023

Published on August 22, 2023
Michigan's vineyards are where grapes thrive and ripen with promise.
Michigan grape scouting report – August 9, 2023

Published on August 9, 2023
Veraison unfolds in northwest Michigan, initiating the harvest celebration.
Michigan Grape Scouting Report – August 2, 2023

Published on August 2, 2023
Veraison in Michigan: The beginning of the harvest celebration!
Michigan grape scouting report – July 12, 2023

Published on July 12, 2023
Promising grape growth and pest and disease challenges in Michigan vineyards.
Michigan grape scouting report – June 28, 2023

Published on June 29, 2023
Get the latest insights on grape growth in Michigan. Explore vine development, canopy management, and potential concerns like drought and smoke. Stay informed about disease and insect issues. Essential for grape growers and viticulture enthusiasts.
Michigan grape scouting report – June 21, 2023

Published on June 22, 2023
Most of Michigan will experience a hot and dry week.
Michigan grape scouting report – June 14, 2023

Published on June 15, 2023
Most of Michigan will experience a hot and dry week.
Michigan grape scouting report – September 21, 2022

Published on September 22, 2022
September is a key month for Michigan grape growers and it is the time to focus on disease and bird management to protect clusters. Sour rot and botrytis are being reported around the state.
Michigan grape scouting report – September 14, 2022

Published on September 14, 2022
September is a key month for Michigan grape growers and it is the time to focus on disease and bird management to protect clusters. Sour rot and botrytis are being reported around the state.
Michigan grape scouting report – September 7, 2022

Published on September 8, 2022
September is a key month for Michigan grape growers and it is the time to focus on disease and bird management to protect clusters. Sour rot is being reported around the state.
Michigan grape scouting report – August 31, 2022

Published on August 31, 2022
Time to focus on disease and bird management to protect clusters.
Michigan grape scouting report – August 24, 2022

Published on August 24, 2022
Veraison is around the corner in northwest Michigan. Harvest has begun in southwest Michigan.
Michigan grape scouting report – August 17, 2022

Published on August 17, 2022
Veraison is around corner in northwest Michigan. Harvest is coming!
Michigan grape scouting report – August 10, 2022

Published on August 10, 2022
Veraison is here. Harvest is coming!
Michigan grape scouting report – August 3, 2022

Published on August 3, 2022
Veraison is here. Harvest is coming!
Michigan grape scouting report – July 27, 2022

Published on July 27, 2022
Hedging at the right time can maintain your canopy young and active at the end of the growing season.
Michigan grape scouting report – July 20, 2022

Published on July 20, 2022
The majority of Michigan's grape growing regions are in the mild grape growing season.
Michigan grape scouting report – July 13, 2022

Published on July 13, 2022
Most of northwest Michigan's grape-growing regions have reached over 900 GDD. In grape berry moth egglaying sites, plan for a lengthy period of protection from the second generation, as this pest's egglaying continues through July.
Michigan grape scouting report – July 6, 2022

Published on July 6, 2022
Second generation of grape berry moth egglaying has begun in southwest AVAs.
Michigan grape scouting report – June 29, 2022

Published on June 29, 2022
In southwest Michigan, a first-generation grape berry moth larva has been seen, while majority of clusters are in full bloom in northwest Michigan.
Michigan grape scouting report – June 22, 2022

Published on June 22, 2022
Most of Michigan will experience a hot and dry week.
Michigan grape scouting report – June 15, 2022

Published on June 15, 2022
Watch for disease infections this week. Northern Michigan could see rains several days. Southern Michigan is hot and humid.
Michigan grape scouting report – June 8, 2022

Published on June 8, 2022
Clusters are expanding in northwest Michigan. Grape bloom is underway in southern parts of the state.
Michigan grape scouting report – June 1, 2022

Published on June 1, 2022
Grape bloom has begun in southwest Michigan.
Michigan grape scouting report – May 25, 2022

Published on May 25, 2022
Wild grape bloom is expected soon in southern Michigan. Shoot growth is slow, but continuing in northern vineyards.
Michigan grape scouting report – May 18, 2022

Published on May 18, 2022
The heat helped grapes throughout the state move quickly over the past week.
Michigan grape scouting report – May 11, 2022

Published on May 11, 2022
This is the first grape scouting report of the season.
Michigan grape scouting report – Sept. 29, 2021

Published on September 29, 2021
This is the last scouting report for the season.
Michigan grape scouting report – Sept. 22, 2021

Published on September 22, 2021
Niagara juice grape harvest is underway in southwest Michigan.
Michigan grape scouting report – Sept. 15, 2021

Published on September 16, 2021
Sugar levels are increasing in wine and juice grapes, but acid levels are still high.
Michigan grape scouting report – Sept. 8, 2021

Published on September 8, 2021
Grape berry moth numbers are increasing. Damage is becoming more common.
Michigan grape scouting report – Sept. 1, 2021

Published on September 1, 2021
Grape harvest is beginning in southwest Michigan. Veraison is underway further north.
Michigan grape scouting report – Aug. 25, 2021

Published on August 25, 2021
Grape harvest is beginning in southwest Michigan. Veraison is underway further north.
Michigan grape scouting report – Aug. 11, 2021

Published on August 11, 2021
Veraison season is here. Third generation of grape berry moth is predicted to be starting in southern Michigan.
Michigan grape scouting report – Aug. 4, 2021

Published on August 4, 2021
Viticulture Field Day was a success. There are several other events planned for the year.
Michigan grape scouting report – July 22, 2021

Published on July 22, 2021
Summer pests and diseases are here.
Michigan grape scouting report – July 15, 2021

Published on July 15, 2021
Rainy weather requires attention to disease scouting and management. Some regions are half way to harvest.
Michigan grape scouting report – July 7, 2021

Published on July 7, 2021
Grape berry moth egglaying has begun in southern Michigan vineyards. Several diseases have been found at high pressure sites.
Michigan grape scouting report – June 30, 2021

Published on June 30, 2021
Grape berry moth egglaying will begin in southern Michigan vineyards soon. Several diseases have been found at high pressure sites.
Michigan grape scouting report – June 23, 2021

Published on June 23, 2021
Grape bloom continues in northern Michigan and is ending in southern regions. Several diseases have been found at high pressure sites.
Michigan grape scouting report – June 16, 2021

Published on June 16, 2021
Grape bloom has started in northern Michigan. Bloom is continuing on vinifera wine grapes in southern Michigan as well.
Michigan grape scouting report – June 9, 2021

Published on June 9, 2021
Grape bloom has started in southern Michigan. Bloom on hybrid wine grapes and early vinifera should begin soon in northern parts of the state. Now is a critical time to control diseases.
Michigan grape scouting report – June 2, 2021

Published on June 2, 2021
The heat from the past week helped grapes to move quickly. Shoots are lengthening throughout Michigan and clusters are becoming visible.
Michigan grape scouting report – May 26, 2021

Published on May 26, 2021
Heat from the past week helped grapes move quickly. Shoots are lengthening throughout Michigan and clusters are becoming visible.
Michigan grape scouting report – May 19, 2021

Published on May 19, 2021
This is the first of our weekly grape scouting reports covering the state of Michigan for 2021. Sign up to receive these reports by email.
MSU Extension’s grape scouting reports for 2021

Published on May 19, 2021
Michigan State University Extension will provide weekly reports of scouting efforts across the state, covering many parts of grape growing including vine phenology and horticultural updates, pest and disease management, and weather.
Michigan grape scouting report – Sept. 30, 2020

Published on September 30, 2020
Concord harvest has begun. This will be the last grape scouting report of the 2020 growing season.
Michigan grape scouting report – Sept. 23, 2020

Published on September 23, 2020
Niagara harvest has begun. Wine and table grape harvests continue.
Michigan grape scouting report – Sept. 16, 2020

Published on September 16, 2020
Harvest is starting for several hybrid and vinifera grapes in southwest Michigan. Northwest Michigan grape harvest will start soon.
Michigan grape scouting report – Sept. 9, 2020

Published on September 9, 2020
Fourth generation egglaying of grape berry moth starts this week in southwest Michigan. Sour rot is being reported around the state.
Michigan grape scouting report – Sept. 2, 2020

Published on September 2, 2020
With harvest approaching, keep clusters protected from insects and rots. Watch your preharvest intervals.
Michigan grape scouting report – Aug. 26, 2020

Published on August 26, 2020
The warm, sunny weather has allowed sugar to accumulate in fruit. In southern Michigan, harvest of some early hybrid varieties will begin in the next one to two weeks.
Michigan grape scouting report – Aug. 19, 2020

Published on August 19, 2020
Most grapes have completed or are starting veraison. Grape berry moth and downy mildew incidents are increasing.
Michigan Grape scouting report – August 12, 2020

Published on August 12, 2020
Pest pressure is increasing, and some growers are clearing up from the derecho.
Michigan grape scouting report – Aug. 5, 2020

Published on August 5, 2020
Egglaying from third generation grape berry moth is starting this week in southern vineyards.
Michigan grape scouting report – July 29, 2020

Published on July 29, 2020
Early varieties are beginning veraison in southern vineyards and downy mildew is visible in unprotected fields. Egglaying by third generation grape berry moth is expected to start next week in southwest Michigan.
Michigan grape scouting report – July 22, 2020

Published on July 22, 2020
Summer meeting season is here. Look here for a list of upcoming grape educational events.
Michigan grape scouting report – July 15, 2020

Published on July 15, 2020
Bloom has ended in northern Michigan. Diseases and berry moth larvae have been found on clusters in southern Michigan.
Michigan grape scouting report – July 8, 2020

Published on July 8, 2020
Vinifera grape bloom is continuing in northern Michigan. Egglaying by the next generation of grape berry moth is expected to start soon in southwest Michigan.
Michigan grape scouting report – July 1, 2020

Published on July 1, 2020
Vinifera grape bloom is continuing in northern Michigan. Egglaying by the next generation of grape berry moth is expected to start soon in southwest Michigan.
Michigan grape scouting report – June 24, 2020

Published on June 24, 2020
Grape bloom has started in northern Michigan. Summer insect and disease management programs are starting in southern Michigan.
Michigan grape scouting report – June 17, 2020

Published on June 17, 2020
Vinifera grape bloom has started in southern Michigan. Disease control is still critical and berry moth catches are peaking.
Michigan grape scouting report – June 10, 2020

Published on June 10, 2020
Hybrid and juice grape bloom has started in southern Michigan. The warm weather has increased the number of phomopsis reports around the state.
Michigan grape scouting report – June 3, 2020

Published on June 3, 2020
The warm, wet weather means disease management is critical now. Prebloom webinar this Thursday, June 4.
Michigan grape scouting report – May 27, 2020

Published on May 27, 2020
Vines are growing quickly. The warm, wet week means disease management is critical.
Southwest Michigan grape scouting report for Aug. 22, 2017

Published on August 23, 2017
An update on veraison, downy mildew and powdery mildew, and botrytis protection.
Southwest Michigan grape scouting report for Aug. 8, 2017

Published on August 8, 2017
Powdery mildew symptoms are increasing. Treat now for third generation grape berry moth.
Southwest Michigan grape scouting report for July 25, 2017

Published on July 25, 2017
Disease pressure is light. Grape berry moth egglaying is ending and SWD catch is up, which may be a problem after veraison.
Southwest Michigan fruit update — July 11, 2017

Published on July 11, 2017
Blueberry harvest is in full swing. Cherry harvest is winding down.
Southwest Michigan grape scouting report for July 11, 2017

Published on July 11, 2017
Grapes continue to size. Attend to canopy management for disease control. Second-generation berry moth egglaying continues.
Southwest Michigan fruit update — July 5, 2017

Published on July 5, 2017
Tart cherry harvest has begun. Spotted wing Drosophila numbers are up and birds are a problem.
Southwest Michigan fruit update – June 27, 2017

Published on June 27, 2017
Blueberry and sweet cherry harvest is underway. Spotted wing Drosophila numbers are up and birds are a problem.
Southwest Michigan grape scouting report for June 27, 2017

Published on June 27, 2017
Bloom is over and grapes are sizing rapidly, with light fungal disease pressure. Grape berry moth egglaying to begin over the weekend.
Southwest Michigan fruit update – June 20, 2017

Published on June 20, 2017
Not enough rain fell last week. The summer fruit season is here with strawberries, raspberries and sweet cherries.
Southwest Michigan grape scouting report for June 13, 2017

Published on June 13, 2017
Juice grape bloom is open while vinifera are in the pre-bloom period; brief review of available spray materials; instructions on grape berry moth model.
Southwest Michigan grape scouting report for May 31, 2017

Published on May 31, 2017
Wild grape bloom is open. Cover fruit for all fungal diseases now. Concord is in the immediate pre-bloom stage.
Southwest Michigan grape scouting report for May 15, 2017

Published on May 16, 2017
Widespread damage from recent frost, wild grape bloom may begin over the next two weeks, and continue protecting against phomopsis and black rot.
Southwest Michigan grape scouting report – May 3, 2017

Published on May 3, 2017
There’s a risk of frost damage over the coming week. Low rates of flea beetle feeding have been detected, and phomopsis and powdery mildew protection is needed in susceptible varieties.
Southwest Michigan grape scouting report – September 20, 2016

Published on September 20, 2016
Harvest continues with good prospects for weather; consider pre-harvest sprays for insects and downy mildew.
Southwest Michigan grape scouting report – September 6, 2016

Published on September 6, 2016
A heavy crop is accumulating sugar. Fourth generation of grape berry moth continues. Expect botrytis in vulnerable varieties.
Southwest Michigan grape scouting report – August 25, 2016

Published on August 25, 2016
Egglaying by fourth generation grape berry moth should begin during the next week across the region. Recent heavy rain and morning dew will increase the risk of downy mildew.
Southwest Michigan fruit regional report – August 16, 2016

Published on August 17, 2016
Heavy rains have relieved drought symptoms, but can cause late-season diseases. Late-season pests are flying.
Southwest Michigan grape scouting report – August 9, 2016

Published on August 9, 2016
Veraison is beginning while young vines experience drought stress. A fourth generation of grape berry moth is predicted this year.
Southwest Michigan fruit regional report – August 9, 2016

Published on August 9, 2016
Late-season pests are flying. Peach volumes are increasing during the harvest of mid-season varieties. Blueberry harvest is winding down.
Southwest Michigan fruit regional report – August 2, 2016

Published on August 2, 2016
Veraison is starting in grapes. Many late-season pests are flying. Blueberry, peach and plum harvest continues.
Southwest Michigan grape scouting report – July 26, 2016

Published on July 26, 2016
Wine grapes are now out of the critical period of disease control, and the third generation control window for grape berry moth begins this weekend or early next week.
Southwest Michigan grape scouting report – July 12, 2016

Published on July 12, 2016
Disease pressure remains low and leaf-feeding pests are few. Apply contact insecticides now to control grape berry moth.
Southwest Michigan grape scouting report – June 28, 2016

Published on June 28, 2016
Grape berries are beginning to size, disease incidence remains relatively low and treatment date for grape berry moth approaches.
Southwest Michigan grape scouting report - June 14, 2016

Published on June 14, 2016
Dry weather bodes well for healthy vines and clusters during bloom; begin monitoring for summer insect pests.
Michigan grape scouting report – May 31, 2016

Published on May 31, 2016
Warm weather in southwest Michigan has increased grape shoot growth.
Michigan grape scouting report – May 17, 2016

Published on May 17, 2016
After recent cool weather, shoot development has gone from about a week ahead of average to about a week behind average.
Southwest Michigan grape scouting report for September 23, 2015

Published on September 23, 2015
This is the final scouting report for the 2015 season. Harvest in Niagara and other early ripening varieties is underway.
Southwest Michigan grape scouting report for September 7, 2015

Published on September 9, 2015
Harvest is quickly approaching in southwest Michigan grape vineyards.
Southwest Michigan grape scouting report for August 25, 2015

Published on August 25, 2015
Fruit are entering veraison and grape berry moth egglaying is winding down for the year.
Southwest Michigan grape scouting report for August 11, 2015

Published on August 11, 2015
Third generation grape berry moth flight is occurring now. Some leaf infections of downy mildew are appearing in Niagara grapes.
Southwest Michigan grape scouting report for July 28, 2015

Published on July 28, 2015
Grape berry moths are between generations, and berry infections from previous rainy periods are showing symptoms in some vineyards.
Southwest Michigan grape scouting report for July 14, 2015

Published on July 14, 2015
Grape berry moth second generation flight is in full swing, and juice grape clusters are developing resistance to fungal infection.

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