By Andi Anderson
Michigan chestnut growers are entering a busy period that requires close attention to orchard conditions, weather patterns, insect pests, and disease management. Regular scouting and timely action can help protect tree health and improve crop performance throughout the growing season.
Recent weather conditions across Michigan have brought temperatures typical for summer, with warm and humid conditions in many areas. Growing degree day accumulations remain near or above normal in most regions, while rainfall patterns vary significantly across the state.
Some areas have received above-average precipitation, while others remain relatively dry. Forecasts suggest warmer and drier conditions may develop over the coming weeks, making orchard monitoring increasingly important.
This is an ideal time for growers to conduct orchard inspections and consider tissue testing to evaluate tree health and nutrient needs. Careful observation can help identify developing issues before they become serious problems.
Several insect pests are currently active in chestnut orchards. Potato leafhopper populations remain present and can damage leaves through feeding activity.
European red mite pressure has increased in many orchards, with hot and dry weather supporting rapid population growth. Heavy infestations can affect tree vigor and overall productivity.
Growers are also encouraged to watch for Asian chestnut gall wasp activity, especially in areas near known infestations. Young trees are particularly vulnerable because damage can impact early growth and orchard establishment.
Rose chafers and Japanese beetles are also active. These insects feed on foliage and may cause noticeable leaf damage. While mature and healthy orchards can often tolerate some feeding injury, young trees with limited leaf area may require more careful management.
Disease monitoring remains equally important. Brown rot continues to be a significant concern in many orchards and can cause serious nut losses. Proper fungicide programs and timely applications remain key tools for disease management.
Growers should also continue scouting for symptoms of oak wilt, a disease that can spread through insects or root connections. Early symptoms may include wilting, yellowing, browning leaves, and premature leaf drop. Suspected cases should be confirmed through laboratory testing.
Existing chestnut blight infections may also be visible in orchards. Since no commercial treatment is currently available, infected branches or severely affected trees may need to be removed to help limit disease spread.
Looking ahead, chestnut weevil management will become a major focus as the season progresses. Continued scouting and preparation will help growers respond effectively when pest activity increases.
Michigan State University Extension encourages growers to stay informed through educational programs, newsletters, and diagnostic services.
In addition, pesticide users are encouraged to obtain proper applicator training and licensing to support safe, effective, and environmentally responsible orchard management practices.
Photo Credit: michigan-state-university-msu-extension
Categories: Michigan, Crops, Education