In most cropping systems, insecticides are still the principal means of controlling pests once the economic threshold has been reached. Because insecticides can be formulated as liquids, powders, aerosols, dusts, granules, baits, and slow-release forms, they are very versatile. To compare pesticide use patterns, the dose, formulation or percent active ingredient of the product, and the frequency of application must also be considered and are used to calculate the EIQ Field Use Rating. Pesticides with a lower EIQ Field Use Rating have a lower environmental impact. The EIQ concept and techniques are evolving, but this, or a smilar rating, will provide information for appropriate pest management decisions in the future.
Natural enemies are generally more adversely affected by chemical insecticides than the target pest.
Because predators and parasitoids must search for their prey, they generally are very mobile and spend a considerable amount of time moving across plant tissue. This increases the likelihood that they will contact the insecticide. The goal is to maximize pest mortality while minimizing harm to natural enemies. Spectrum of activity. Most insecticides in use today have a broad spectrum of activity.