Here, a combination of unrelated products is used. Using this model, if insects survive, say, a larvicide treatment, they are killed as adults by a bait.
The larvicide and bait must be from complementary chemical groups showing no cross-resistance.
Multiple attack may combine a chemical and biological component. The chemical can be a bait or a narrow-spectrum larvicide; the biological agent can be a beetle or parasitic wasp.
Bait could also be used, combined with a fly which competes with house flies in the larval environment.
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