Martin: I believe wasps eat mostly other other insects. Could be they are after insects in the flowers like aphids who produce honeydew that the wasps feed on as well. Arnold New Jersey On 08/08/15, Garak wrote: Hi everyone, this summer starts to feel somewhat Hitchcock-style - this time it's the wasps that run amok. With them it can't be hunger, because there are tons of fallen apples in the gardens around. When they started to act peculiar, they chewed on green seed heads of Centaurea montana - fine with me, because those tend to be invasive. Then they found Tigridia Pavonia... http://www.planetoblivion.de/img/Waspattack.JPG Greetings from a startled Martin.