Lady beetles can be purchased in mesh bags or in small boxes that hold anywhere from 1,500 bugs per pint container up to 70,000 beetles per gallon. The best way to release lady beetles for the control of aphids is to sprinkle or spray the foliage with water and release the beetles directly on the infested plants at dusk or early in the morning when dew is still on the plants. If you apply water, add two tablespoons of molasses per gallon of water. The lady beetles will definitely appreciate the added sweets.
SEE: Lady Beetle