Having been an avid gardener for 40 years, I've had my share of battling insects that were trying to eat my flowers and vegetables. I live out in the country on 20 acres where I tend to several large gardens.
Generally, dust, such as Sevin, is most effective when applied in a very thin layer. Insects are more likely to avoid heavy applications of insecticide dusts, and more likely to come into contact with dust that is applied sparingly. With most dusts, we want the insect to readily come into contact with the dust. This is true when the dusts are used outdoors in the garden, or indoors for insects that are a problem in our homes.
Applying a thin layer of dust is more effective at controlling insects and itís much safer for the environment. Dust applied in thin layers is also kinder to the beneficial insects and birds. Birds and beneficial insects such as Bees, Praying Mantises and Lady Beetles contribute more than all the insecticides combined to protect our vegetable and ornamental plants from insect damage. Itís also more economical. Another name for this approach is Integrated Pest Management (IPM), which is the wisest of all methods used to control pests that become a problem for gardeners and farmers. Most important of all, using insecticides sparingly is safer for our children our pets and ourselves.
When using any insecticide, follow the label instructions, itís more effective at controlling the bugs we want to get rid of. By using twice as much or mixing it stronger than the label directions, can often reduce the effectiveness. The original metal Hudson Adjutant Duster is a favorite of many gardeners. You are able to apply a very thin layer of dust to the top and bottom of leaves.