kamakiri
Well-known member
The thicker foam might be the main preventer. In that second pic you can see the wasp's ovipositor is long, but may not be long enough to penetrate into the Chinese egg chamber.No evidence of it on the chinese ooths. I wonder if their thick foam prevents the wasps from laying eggs in them? Also, I wonder if that helps explain their ever increasing numbers over the others? Click the pics to enlarge.
This wasp also likely evolved with the native mantises and there could be other cues that draw the wasp to these particular ooths. Size, shape, pheromone...finding that out would be a cool experiment. And there lies the danger of introduced species without their natural predators. Thicker foam may be partly why sinensis and religiosa have done so well here in the US.
Great thread to follow! Thanks to Rick and all the contributors.