MSU Extension Christmas Trees

Challenges on the Horizon
February 5^th, 13^th, 19^th, 26^th
12:30 to 2 p.m. ET 

The 2026 winter webinar series will focus on "challenges on the horizon" that will likely impact Christmas tree production in the Great Lakes region in the near future.  Each week will feature a different topic and potential solutions to address those challenges. RUP credits have been requested for the following states: CT, MA, MI, NH, OH, PA, IN, and VT.  

Cost: $20 to register for entire series

Webinar Overview:

Feb. 5, 2026

Development of Herbicide Resistance in MI Weeds: Dr. Erin Hill, Michigan State University 

Summary: Weed control is a major challenge in Christmas tree production. Inadequate weed control reduces tree growth and quality and can result in greater transplant mortality and longer time intervals between rotations. Herbicides are commonly used as part of a weed control program to manage weeds. However, the development of herbicide resistant weeds could be a major challenge to future weed control in Christmas tree production. This webinar will discuss what herbicide resistance is, how weeds become resistant to herbicides, strategies to minimize or prevent this from happening, and steps growers can implement if weed resistance is suspected.

Feb. 13, 2026

Cold Acclimation and Needle Retention: Dr. Mason MacDonald, Dalhouse University

Summary: Christmas trees undergo a set of physiological changes in response to decreasing temperatures and shortening photoperiod. One of those responses is an increase in needle set, or the ability to hold needles post harvest. However, with increasing fall temperatures and the demand for trees to be harvested and sold earlier in the fall, the ability for trees to change physiologically and hold needles may be impacted.   

Feb. 19, 2026

Invasive Insect Update: Dr. Deborah McCullough, Michigan State University

Summary: Elongated hemlock scale? Cryptomeria Scale?  Balsam woolly adelgid? These insect pests are not common in the Great Lakes region; recent sightings may indicate that these pests are encroaching on the area. Join Dr. Deborah McCullough as she discusses the current status and research of these pests. We will go through their life cycle, how to scout for signs of these pests and steps growers can implement to prevent their spread in the region.

Feb. 26, 2026

Maintaining Productive Soils in Continual Cropping Systems: Monica Jean, Michigan State University

Summary: Maintaining productive soils is a challenge in agricultural production systems. Many Christmas tree fields have been in production for multiple tree rotations. This webinar will discuss how continuous production can impact soil health and why it matters for Christmas tree producers. This webinar will showcase new research in soil testing parameters for soil health and potential application for Christmas tree production in the future.