Fungal Spot on Iris
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- čas přidán 18. 06. 2020
- It's Flower Friday! Every Friday we will post a new video about gardening, flowers, pest control, etc, just in time for you to dig into your own garden this weekend!
We came across this Iris and had to know more about the interesting spot on the leaves. I thought you might like to learn about it with us!
We researched it on site and found out that's it's called Didymellina macrospora. It tends to affect Iris's that are in certain environmental conditions like mild, cool weather, restricted airflow and when infected leaves are allowed to accumulate instead of being removed.
You can treat it by simply correcting the poor conditions - sanitize the area by cleaning up the dead, infected leaves and improving airflow.
The research we did said that this fungus can be treated with fungicides so we tried a baking soda spray. We'll do a follow up video in the fall when it's time to cut the leaves to see how it did.
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:)
Thanks will check it out.
You’ve done a wonderful job with those irises! I think I’ve been over watering them.. I keep cutting back brown leaves then more brown comes up & they are wilting more than standing tall.. I’ll try this baking soda mixture..something about not burying them too deep also?
Yes, I have a couple other videos on dividing and planting irises. They do not like to be planted deeply, just a light cover of soil over those rhizomes, which lay flat on the ground or in the shallow hole. They like well drained soil, and more on the dry side. They only really need water when they are setting bloom, so they are well suited for my area because we only get water in winter and a little in spring. If you think you might be overwatering, definitely cut back before trying anything else. The baking soda wont help if they are drowning.
As a child I remember just dropping the iris on the ground and it grew. Now I can't grow them for amything.
Are the conditions right for them? They prefer drier, well drained soil and lots of sun. They like loamy soils too, but if it get's too heavy or too wet they will start to suffer.
How much baking soda & dawn to help?
I fill a spray bottle with water and add a squirt of dawn and about a tablespoon of baking soda. Enough to be effective without clogging the sprayer.
I hope this helps :)
@GardenUPLandscape , How often we should do this treatment? Like 2 or 3 times a week? For how long ?
Well, I've only seen this the one time when I shot this video. I sprayed it this once, and when I checked on it a few months later it was all cleared up! So it's highly anecdotal, but in my limited experience: just clean up the dead leaves around the plant so it gets airflow, make sure you aren't over watering it, treat once and you're probably done! Repeat if it's needed.
My Iris came down with fungus. We sprayed a solution of cooking oil, dishwashing detergent and baking soda. We sprayed *& cleaned plants. Am wondering. These iris in.need of replanting/dividing. Will this disease continue in newly divided Iris. Should i give plants second spritz of baking soda when I decide my Iris? Any help would be most welcome. Thanks.
Thanks for your question! First, I'm not sure the oil will do any good for this. Mostly cleaning up the plant and getting air flow is enough to clear up this fungus. When I went back later to the plant in this video it was doing great and had no more spotty leaves.
You may need to divide your Irises if they are loosing vigor and not blooming as well, or if the rhizomes are just getting too crowded. I have another video all about that posted last fall, please check it out :)
As for if the disease will still be present after division, possibly. The pathogen will likely still be present in the plant, but whether or not it presents itself by making the leaves spotty will depend more on the overall health of the plants. I would definitely keep the area tidy by taking out dead and dying leaves and continue to spray baking soda if ever you see spots.
I hope this helps! :)
What is the concentration of baking soda and dawn? and water I assume?
I've actually never measured it. It's a squirt of Dawn, enough to coat the bottom of your sprayer is about right, and about a handful or two of baking soda, which is about 1 or 2 Tablespoons, for a sprayer this size. And yes, fill the remaining space in your sprayer with water and give it a good shake. You want the concentration of both the soap and the soda to be sufficient to be effective, without clogging your sprayer... Which is kind of a trial and error thing.
Thank you for the comment! I realize I really should be more specific with this recipe! I'll see about figuring out actual measurements this year and I'll get a video done on that!
Saw these marks in garden but found tiny insects size of shapes on them
I'm not familiar with many insects that eat iris, or iris fungus. Occasionally I'll find a family of earwigs nesting under the dead leaves.
How much dish liquid and baking soda to how much water
I don't really have an exact recipe. I tell people to put as much baking soda and soap as you can without clogging your sprayer (which is hard to know until it happens, and then it's too late). In most cases I put in a palm full of soda, which is about a tablespoon, and a small squirt of soap, just enough to make the soda stick.
GIRL.....Where are your gloves
LOL you'll see if you watch more of my videos, I hardly ever wear gloves. I can't stand them! My hands get dirtier wearing them than not, so I only wear them if I'm working with something really prickly like a Juniper or Oregon Grape or if it's cold and I actually need gloves to keep my hands warm.
Please comment on disposing the diseased leaves. Not sure, but I think you're not supposed to put them in a compost pile.
I would hazard a guess that you are correct. It's best to put any plant material infected with a fungal or bacterial pathogen in the trash or a burn pile, not in the compost.