Another plague of wasps is on its way, experts from Ghent University warned last week. The fine spring brought the insects out earlier than usual, and the continuing warm weather means queens carry on laying eggs, so that September could see the arrival of a new generation of the stripey pests. “One queen could even produce as many as double the number of young. We’re talking about 40,000 eggs instead of 20,000,” said Frans Jacobs, professor of zoo physiology.