fungus
By George Bonnema, Luverne HorticulturalistJune 15, 2021The lilacs have finished blooming so if you need to prune them, this is the time to get that done. Remember to cut them back far enough to give them room to grow to the size you will want them to be. If there are no leaves on the stems when you have finished the task, that’s OK. They will develop new leaves on the stems that have been cut back. I noticed black spots showing up on Goldsrum…
By George Bonnema, Luverne HorticulturalistJuly 30, 2019It seems that my sprayer has been in my hand for most of the summer. Wet is good to a certain extent and then it becomes an ongoing invitation to blight and fungus infections that are hard to control, and that is where I am right now … so the battle continues. I am seeing a lot of the lower leaves of fall-blooming purple dome asters turning yellow and dry. Most often this is the symptom of damage…
By George Bonnema, Luverne HorticulturalistJune 18, 2019We are into the right temperature and moisture conditions for lots of fungus issues to attack our plants. For roses, black spot is a serious disease that shows up first as a black spot on the rose leaf. The leaf then turns yellow and falls off. This fungus normally starts on the lower leaves where the foliage is fuller, thus restricting air movement so the leaves stay wet longer when we have…
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