Aphid honeydew. Gunk. Particularly
under cottonwoods, there are large sticky wet spots.
If you stand under the true for a minute it feels like a very light drizzle. (One reason the close up picture below isn't better. I just couldn't stand under there for long. It wasn't just me, but my camera was getting dripped on.)
Here's a closer look of the sidewalk, gunking up. There are even bubbles.
And here are the culprits. (Double click any picture to enlarge it.) The best option I know (if you don't want to use poisons) is to wash the trees with a heavy spray of water everyday. The ones that are getting are deck sticky get sprayed. The others I leave alone.
If you stand under the true for a minute it feels like a very light drizzle. (One reason the close up picture below isn't better. I just couldn't stand under there for long. It wasn't just me, but my camera was getting dripped on.)
Here's a closer look of the sidewalk, gunking up. There are even bubbles.
And here are the culprits. (Double click any picture to enlarge it.) The best option I know (if you don't want to use poisons) is to wash the trees with a heavy spray of water everyday. The ones that are getting are deck sticky get sprayed. The others I leave alone.
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