Wasps are generally regarded as pests when they fly around your picnic or barbeque (especially if they sting you), but in the garden they compete with bees for food and eat caterpillars (ever wondered why your monarch butterfly caterpillars were disappearing?).  Once you have caterpillars on your swan plants, cover them over with netting to prevent the wasps getting in. Not all wasps are pests, in fact some play an important role in natural biocontrol. Almost every pest insect species has … [Read more...]