diagnose plant problems and identify plants - Ask Extension
I have the following questions:
1. Do you have any idea of what's causing the brown spots on the leaves shown in the file, "agastache green:?
2...
Knowledgebase
diagnose plant problems and identify plants #869153
Asked May 19, 2024, 6:56 PM EDT
I have the following questions:
1. Do you have any idea of what's causing the brown spots on the leaves shown in the file, "agastache green:?
2. Do you have any idea of what's causing the brown blotches on the leaves shown in the file, "agastache white &green"?
3. Can you tell is the plant is poison ivy in the file, "poison ivy?".
All of the plants in the attached photos were photographed on May 19, 2024 at my house in Potomac, MD.
Thanks!
Montgomery County Maryland
Expert Response
The leaf damage that you are seeing on the plants in your first photo is caused by four-lined plant bug, which regularly shows up at this time of year. They are secretive and hard to see as they quickly hide/move when you are looking for them.
You can see them here:
https://extension.umd.edu/resource/plant-bugs-flowers/
The good news is that there is only one generation per year and the plants are not harmed by the damage which will soon be covered up by a new flush of leaves.
Your mystery plant is not poison ivy but looks like a bramble/berry like raspberry or blackberry, which will have thorns.
The brown spots and darkened foliage on the green and white variegated-leaved agastache are also caused by the four-lined plant bug. You can trim out the most affected leaves if you like.
Christine
You can see them here:
https://extension.umd.edu/resource/plant-bugs-flowers/
The good news is that there is only one generation per year and the plants are not harmed by the damage which will soon be covered up by a new flush of leaves.
Your mystery plant is not poison ivy but looks like a bramble/berry like raspberry or blackberry, which will have thorns.
The brown spots and darkened foliage on the green and white variegated-leaved agastache are also caused by the four-lined plant bug. You can trim out the most affected leaves if you like.
Christine
Thank you! Just what I needed to know!
On May 20, 2024, at 11:15 AM, Ask Extension <<personal data hidden>> wrote:
