Wasps and Hornets Don't Collect Pollen
Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow. Bees and wasps and hornets are in the same family, Hymenoptera, but have certain differences. In all cases, only the females can sting, as the egg-laying ovipositor also functions as the stinger. The female bees also are the sex which collects pollen, either in special structures called corbiculae, or in hairs on their bodies. For bees, pollen collection is necessary as bees make a mixture of pollen and nectar which serves as the food source for their young.
You won’t find pollen collecting structures on wasps and hornets as they feed their young some form of meat. Most of them capture insects or spiders, paralyze them with the toxins in their sting, and lay their egg on this fresh source of food. Yellow jackets, however, feed their young masticated meat, particularly from caterpillars. So these often aggressive insects do have benefits for us vegetable gardeners.