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Have a big tree that gets severely infected every year. Wasps love it and feed heavily on them.

Despite all the bad press they get I honestly think a neonicotinoid would be best. My reason is they are less broad spectrum than pyrethroids (which kill everything) and more effective than organic.  

If it’s a mature tree I wouldn’t bother unless it looks to be suffering. The wasps and honeydew are likely to be a bigger issue. 

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2 hours ago, Stere said:

Why not just use a  pressure washer blast them off?


If you do add a bit of soap as it is supposed to lower the surface tension and block their airways.

 

I grew peppers last year and used a water pistol to keep aphids off but then I was doing it regularly not as a one off.

 

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