Tuesday, August 30, 2011

Yellow Jackets and hornets

I noticed a couple of wasp nests recently. One is in a hole in the ground at the base of a maple tree. There were yellow jackets coming and going every other second. Some yellow jacket wasps make their nests in trees and some occupy a borrow in the ground made by some other animal. Judging by the number of yellow jackets coming and going from the nest the nest must be a substantial size. Wasps only occupy a nest for one year. The young fertilized queen over winters in a sheltered location in the earth or in a rotten log and starts their hive by themselves raising their first brood in the spring. Once the first brood is raised they start doing all the work taking care of the nest and foraging for food. The nest then grows quickly until by the end of summer there can be thousands of wasps in a nest. At the end of summer the next generation of fertile queens and male drones are produced and then the hive dies.

The bald faced hornet nest is always in a tree or somewhere above ground. They are quite a bit bigger than the yellow jackets being close to an inch long. I have never been stung by them and they don't seem to be too upset by me being close to their nest but they have a fierce reputation for defending their nests with a powerful sting. They are a type of wasp and have a similar life cycle of annually producing a new football sized nest with the hive dying out before winter comes.

Above is a picture of three bald faced hornets feeding on some sort of powder coming off a white fungus. Yellow jackets were also vigorously coming and going from the trunk of this alder bush that was covered by this powdery and downy fungus. The wasps didn't seem to be feeding directly on the fungus but looked like they were licking the twigs close by. I suspect they like the taste of the spores that visibly covered the ground below the bush. Evidently according to various articles the adult wasps like sweet carbohydrate rich foods (such as soda pop) but that they are also predators attacking and killing insects that they then feed to the larvae. Interestingly, the larvae are suposed to secrete a carbohydrate rich nectar that the wasps then eat.

1 comment:

  1. This isn't a fungus. I later learned this was a colony of wooly alder aphids and the hornets and wasps are probably collecting honeydew.