Many plants outgrow aphid infestations with no harm done. But sometimes aphids do cause permanent damage to tender shoot of young plants. If action must be taken, soft-bodied aphids can be killed by common non-toxic ingredients found at home. Here is a recipe for a spray from The Frugal Gardener by Catriona Erler (Rodale, $27.95):
- 1 garlic bulb
- 1 small onion
- 1 teaspoon cayenne pepper powder
- 1 quart water
- 1 tablespoon liquid dish soap
liquefy garlic and onion in a blender, then add cayenne and water. Steep for an hour. Strain the liquid through cheesecloth, then add soap. Spray directly on aphids, or on plants vulnerable to aphids, like roses. Keep away from eyes and skin. This spray may be kept refrigerated for one week.