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Common wasps, Vespula vulgaris, are very similar in appearance to German wasps. In these species, members of the colony cooperate in the care of the young, and the building and protection of the nest. Females are easily identified by:
New Zealand has some of the highest densities of social wasps in the world. Large densities have been observed in beech forests containing honey dew. Their natural enemies are not present here, winters are mild, and there is an abundance of food for which they can out-compete our native insects and birds.
Biological and Chemical control methods have been developed to control wasp populations.
Biological control has been used to try and achieve widespread control of wasps. Since 1987, a parasitoid (called Sphecophaga vesparum vesparum) has been released at hundreds of sites throughout New Zealand. This parasitoid was brought from Europe where it attacks the same wasp species we have here. It lives in wasp nests, feeding on and thus destroying developing wasps. Other trials used include the use of pathogens.
Chemicals can be used against wasps in two ways - either finding and destroying all nests in the area, or using poison bait. The advantage of poison bait is that foraging wasps carry the poison back to the nest. This means you don't have to find and approach nests. Both methods will only alleviate the problem for the current season, and workers from further away are likely to turn up looking for food. In the next season, the area will almost certainly be reinvaded by queen wasps, which can fly from 30 to 70 kilometres before establishing a nest. The problem will therefore have to be dealt with each year.