The effects of IGRs on insects include abnormal molting, twisted wings, loss of mating behavior, and sometimes death to embryos in eggs. They interfere with certain normal processes and prevent immature insects from completing development into normal reproductive adults. Insect growth regulators or IGRs mimic the action of an insect’s naturally occurring juvenile hormone. An immature insect treated with a chitin inhibitor dies the next time it attempts to molt. Chitin is the primary structural chemical in an insects body wall. Finally, pheromones are the most restrictive because they react with only one species or one sex of a single species.Ĭhitin synthesis inhibitors interfere with the development and molting of immature insects causing their death. They affect certain groups of species that have a particular hormone. Growth regulators are even more specific. The chitin inhibitors only affect animals with chitin in their exoskeleton (i.e. While many insecticides are broad spectrum, killing a wide variety of animals by attacking a system common to all, such as the nervous system, a new group of insecticides are much more selective. No broad spectrum insecticide kills all insects each varies as to the kinds of insects it controls. These “broad spectrum” pesticides are used when several different kinds of insects are a problem. ![]() Many insecticides are general purpose or wide range killers. Sometimes you can choose these insecticides when you wish to kill only one insect pest and not other beneficial insects in the area. Some insecticides kill only a few kinds of insects. Insecticides vary in the numbers of different kinds of insects they kill. ![]() When the insect feeds on this plant or animal, it ingests the systemic chemical and is killed.īroad Spectrum. Insecticides called Systemics may be absorbed, injected, or fed into the plant or animal to be protected. Some insecticides kill both by touch and by swallowing. An insecticide may kill the insect by touching it or it may have to be swallowed to be effective. Often the word “insecticide” is confused with the word “pesticide.” It is, however, just one of many types of pesticides. Insecticides are chemicals used to control insects. For example, a pesticide may be more effective and less costly as a bait, rather than as a surface spray. The way that each pesticide attacks a pest suggests the best way to apply it to reach and expose all the pests. Others must be swallowed to be effective. Some pesticides must only contact (touch) the pest to be deadly. Therefore, insecticides, fungicides, herbicides, etc., are all types of pesticides. The pests may be insects, plant diseases, fungi, weeds, nematodes, snails, slugs, etc.
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