Wasps can be deadly to grapevines and extreme nuisances to growers. They are highly attracted to sugar and will attack grapes by splitting open the fruit. It is crucial to wear protective gear when dealing with wasps and wasp nests. Besides being extremely painful, wasp stings can trigger an allergic reaction resulting in severe pain and, in extreme cases, death. Visit your local farm or pest control store to acquire the appropriate protective clothing.
Locate the nest. Wasps often build nests beneath the overhangs of buildings, in tree logs or underground within a 250-meter radius of anywhere an individual is spotted. Follow adult wasps at nightfall to find their nests.
After the sun has gone down, generously dust the wasp nest with PyGanic Dust or Pyrenone insecticide. If wasps start to emerge, you may also dust them with the insecticide to prevent being stung.
Seal the entrance hole with plaster of Paris or oil. This prevents wasps from digging out of their nest or forming a new one from the old structure.
Monitor the nests for the next several days and reapply insecticide if any stragglers remain. Once nest is fully abandoned, you may remove it by calling professional exterminators or digging it up in fully protective clothing.