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Contact insecticides kill by touch. The pest has to be attacking the plant before it can be applied and it is dependent upon direct contact for a kill. Such insecticides are used against pests that chew rather than suck.
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Contact insecticides are usually not effective on leaf miners, since the insect is protected by the outer leaf surface.
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Contact insecticide - a poison that must contact the body of the insect to be controlled. Contractile - drawing together resulting in decreased size or bulk. Cool-season crop - a crop that grows best during the cool temperatures of spring and fall.
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Bt is not a contact insecticide. It has to be consumed by the target pest to become effective. There are four varieties of Bt in use: Bt var. tenebrionis, which is effective against Colorado potato beetle and elm leaf beetle larvae; Bt var.
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After the gall starts to form with the eggs inside, they are protected from contact insecticides.
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When the GLH appears in high numbers the application of a contact insecticide may become necessary. For good GLH control it is important to obtain complete spray coverage of the undersides of the leaves.
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The bait box contains cells of wood, which is put in place for about eight weeks, and then the whole colony is treated with a range of contact insecticides, and is carried out only by an authorised pest controller.
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 See also: Insect, Insecticide, Plant, Soil, Insecticides
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