Pull out any weak plants. They may already be infected. If not, they will attract predators. Pull the plant and dispose of it away from the garden area.
Build healthy, organic soil. Natural composting methods, mulching and top-dressing your soil with compost or natural fertilizer is the best way to develop strong, vigorous plants.
Seaweed mulch or spray. Seaweed contains trace elements such as iron, zinc, barium, calcium, sulfur and magnesium, which promote healthy development in plants. Seaweed fertilizer in mulch or spray form will enhance growth and give plants the strength to withstand disease. Seaweed mulch also repels slugs.
Minimize insect habitat. Clear garden area of debris and weeds which are breeding places for insects. Use clean mulch.
Interplant and rotate crops. Insect pests are often plant specific. When plantings are mixed, pests are less likely to spread throughout a crop. Rotating crops each year is a common method to avoid re-infestation of pests which have over-wintered in the bed.
Keep foliage dry. Water early so foliage will be dry for most of the day. Wet foliage encourages insect and fungal damage to your plants. See our page on drip-irrigation for methods of delivering water to the root systems without wetting the foliage.
Disinfect. If you've been working with infested plants, clean your tools before moving on to other garden areas. This will reduce the speed of invading insects.