Eastern tent caterpillars had taken up residence in one of his pump houses. These insects are not necessarily pests of blueberries, although they can feed on Vaccinium. They are more commonly found in trees creating their characteristic tents. I do not anticipate eastern tent caterpillars posing problems in blueberries, but if they do, we have tools to deal with them.
Tent caterpillar carnage in an oil leak under the pump.