Processionary caterpillars

I have been lurking for a few weeks now and have been very impressed by the knowledgeable posts.
 
My husband and I recently moved permanently from England to SW France, (450 m up in the Montagne Noire near Carcassonne), and inherited a beautiful garden, I have been reading all I can find on mediterranean gardening  including Mediterranean Gardening by Heidi Gildemeister and The Mediterranean Garden by Hugo Latymer and have joined the MGS.  My problem is that I have a pine tree in excess of 60ft high which has many cobwebby nests hanging from its branches.  I have been told that they belong to processionary caterpillars.  The tree is too tall to spray and too tall  for me to prune the affected branches.  Can anyone suggest how I can rid the tree of its unwelcome visitors.
 
Jill Randall
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