prepared by Mr. Doug Holen, Extension Educator - Crops, Morris Regional Office We continue to scout fields and receive calls regarding the overwintering condition of alfalfa and alfalfa/grass hayfields from around the region. It is common to find significant damage to field and pasture grasses specifically orchardgrass and fescues, as well as alfalfa. A recurring observance seems to be as follows:
Alfalfa seeded in 2014 looks good
Alfalfa seeded in 2013 seems "ok"
Alfalfa seeded prior to these dates has considerable damage (see photos below of 2012 seeded research plots)
Grasses, aside from smooth bromegrass and bluegrass, were significantly damaged
Back in 2012, a very significant migration event involving aster leafhopper occurred in early May. The Aster leafhoppers settled in grasses, particularly wheat fields when they first arrived. Weather events of the past 10 days have also been conducive for bringing in leafhoppers from the southern US into our region, but not even close to the numbers the appeared in 2012. Since they have been reported we want to make you aware of them.
Due to the wild, fluctuating weather patterns that have hit over the past week, there are a number of published articles by UMN Extension Specialists that address information on effects of frost or cold temperatures, what soil moisture levels interaction with pre-emerge herbicides, and pest management questions that are starting to pop up around the region. There are multiple ways to receive news updates through extension. Currently, the Minnesota Crop News is becoming one of the quickest venues to receive updates on cropping issues at the statewide level. Links to current articles are listed in the right column. We would also encourage you to subscribe by e-mail to receive these notices as they are published. follow this link to subscribe to Minnesota Crop News ***************************************************** 5-20-15 comments from Bruce Potter, Extension IPM Specialist, SWROC Lamberton, MN "I am starting to receive calls and photos of soybeans injured by frost in areas of southwest and central Minnesota. "Reports so far are of freeze injury to the crook of soybean plants in the process of emerging. Relationships of injury to residue, topography and, of course, planting date and it sounds that larger soybeans were fine. "Plants injured this way can be killed or severely calloused but this depends on the extent of the freeze. "Time is needed to evaluate the extent of injury and determine if a replant strategy is needed. "