Crepe Myrtle Aphids and the effects of overplanting

Srt8madness

Omono
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Houston, Tx
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9a
If you've ever driven around Houston, specifically the middle and upper class suburbs, you'll see crepe myrtles. Like, lots of them. Literally everywhere. Every grocery center parking lot, every strip center median, lining the fences outside neighborhoods, in everyone's yard, EVERYWHERE. Once you start seeing them you can't stop.

What else I've seen upon closer inspection is that the vast majority are suffering of crepe myrtle aphid infestation and subsequent black sooty mold. I've been battling it on mine as well. Systemic works for my potted trees, but the in grounders are hopeless, even after defoliating.

My unscientific observation is that massive overplanting of a species has allowed the pest problem to explode exponentially.

Am I totally off base here? What are some other examples of overplanting leading to problems? Too much of a good thing I suppose.
 
If you've ever driven around Houston, specifically the middle and upper class suburbs, you'll see crepe myrtles. Like, lots of them. Literally everywhere. Every grocery center parking lot, every strip center median, lining the fences outside neighborhoods, in everyone's yard, EVERYWHERE. Once you start seeing them you can't stop.

What else I've seen upon closer inspection is that the vast majority are suffering of crepe myrtle aphid infestation and subsequent black sooty mold. I've been battling it on mine as well. Systemic works for my potted trees, but the in grounders are hopeless, even after defoliating.

My unscientific observation is that massive overplanting of a species has allowed the pest problem to explode exponentially.

Am I totally off base here? What are some other examples of overplanting leading to problems? Too much of a good thing I suppose.
We have Crapes all over the place here too. We have big mature 15-25 foot tall crapes lining my street, as well as in a lot of yards. No issues with aphids or mold on any of them. I would guess, this is local probably due to local climate.
 
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