🚀 go-pugleaf

There are a lot of yellow-green caterpillars dangling from our oak trees on 
threads. I think that they are the "oak moth caterpillar", but here's a picture of  
them (as found on my driveway in the hot sun):

ftp://ftp.z9.com/pub/caterpillars2.jpg

Interesting how much larger one of them is than the others. Also interesting that 
one is much more brown than the others.

In past years they have done a lot of damage to our largest oak, and I am  hoping 
that this does not happen again. The tree looks like it is dying back compared to 
the other trees around it, but there is lots of new foliage this year.

I used a reputable local tree service for two years that would spray selected 
trees, but their spraying schedule depends on when they are in the neighborhood. 
It took a lot of patience to stand outside for a week listening to them chew down 
the tree before the treatment was done. The damage was substantial. I'm thinking 
about trying to treat it myself this season.

I've tried hosing down the tree with water from a well-focused nozzle, to knock 
the pests off the leaves. But it is hard to reach all of the tree. I also tried a 
circular nozzle on power washer, with about the same reach. Any other suggestions 
?