Gary in Hawaii has brought to notice an interesting topic. Organic & permaculture gardeners recommend planting an area of between 1% & 5% of your land with a nectar source for beneficial & pest-controlling insects for good results. This can be along fencelines or garden edges. Planting particular flowers & herbs, known as insectary plants, has been proven to improve the natural balance & reduce pest outbreaks. The insectary plant area should be allowed to go wild & provides year-round nectar, pollen & habitat for native & introduced beneficials, e.g. predatory mites & wasps, ladybirds, lacewings, hoverflies, tachnid flies & predatory beetles as well as bees. Insectary plants include red clover, lucerne, sweet alice, dill, caraway, coriander, cosmos, buckwheat, baby's breath, marigold & Queen Anne's Lace. Every little bit helps. Geoff in Nimbin Subtropical NSW Australia