Aphids control: natural and with the use of insecticides
Warmest temperatures on record contribute to increase in population of different insects: bees, butterflies, grasshoppers, mosquitoes as well as aphids. In hot summer insects arrive yearly and in a larger number, and complete their life cycle faster. All these factors contribute to the spike in population of aphids. Control becomes necessary to protect your trees.
Aphids are tiny insects (0.125-0.25 inch long). Colors vary from bright orange or red to grey. There are over 300 species of aphids in Colorado. Aphids feed by sucking plant sap. In normal circumstances natural enemies take care of aphids control. Lady beetles, green lacewings, syrphid flies can be seen on the same plant hunting for aphids. Presence of ants is a sign that you might have aphids. Ants like honeydew produced by aphids and protect aphids from their natural enemies. By getting rid of ants you will allow natural enemies prey upon aphids.
In hot weather it takes about 7-10 days for aphids to complete its life cycle. When abundant, aphids suck a lot of sap from the leaves, reducing plant vigor and causing curling of the leaves. To control large number of aphids it may be necessary to spray your trees with insecticides. Contact insecticides are useful for aphids control where aphids are exposed on the plants. Insecticides generally effective include pyrethroids and insecticidal soaps.