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Minnesota, zone 4
Feb 11, 2017 9:46 AM CST
|Every season, my climbing rose starts out healthy, then progresses to develop leave covered in tiny spots, then turn yellow and fall off. I've tried pesticides, insecticides, safer soap and home remedies using baking soda, what is this and what can I do? I live in Minnesota so right now everything is dormant. Just thought I'd get a jump ahead to my Rose problem, as I REALLY have spring/summer fever|
Feb 11, 2017 3:32 PM CST
|Can you post a photo of what the infected leaves look like ?|
Feb 11, 2017 3:53 PM CST
|It sounds like blackspot fungus. Your profile doesn't list your location. Blackspot is most common in humid areas like the hazy hot and humid northeast, and the just plain humid southeast.
Some roses are disease resistant than others - something to think about if you add new roses.
Cleanup is key - remove dropped leaves, keep mulch away from the drip line of the plant, don't compost rose trimmings or leaves.
A healthy rose is less susceptible to disease. Feed and water your roses regularly. Water at the base of the plant early in the day if possible so any damp leaves have time to dry.
A systemic product like Bayer systemic rose granules applied regularly made a big difference in black spot in my garden. I applied the systemic granules to the vulnerable plants regularly. I marked fertilizing and treatment days on a calendar to keep track.
I garden as naturally as possible. The Bayer systemic rose treatment is the only non natural product I use in my garden. (Bayer sells several types of rose treatments. Shake the bottle. If it rattles, it is the systemic. If it sloshes it is a spray, which I don't use. It is a good product, but I have asthma. I only spray natural products like neems/soap/baking soda)
As I add roses, I look for disease resistant varieties, but I don't want to give up my favorite diva roses. It is a personal dilemma, but I thought that I would share it with the group. People have very strong opinions about organic/natural/chemically assisted gardens. Each gardener makes her/his own choice. This group has always respected divergent opinions.
Feb 11, 2017 3:57 PM CST
|I forgot to mention air circulation. Rose experts recommend ample air circulation to avoid fungal diseases like blackspot. Trimming nonproductive canes may help. There are lots of great videos on youtube on pruning.
Good advice, but .... I grow lots of flowers in a small space. My goal is a cottage style planting. I just moved again with all of my plants - 3 moves in 4 years. I have the remaining survivors in a pot ghetto in my tiny yard.
I agree that your location and pictures of the leaves would be very helpful. You don't have to mention the town, just the state and gardening zone.
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