A Pesticides is any chemical which is used by man to control pests.  The pests may be Insets, Fungi, weeds, Plants Diseases, Snails, Nematodes, Slugs. Therefore, herbicides, fungicides, insecticides , etc are all types of Pesticides.  Some Pesticides must only contact the pest to be deadly.  Others must be swallowed to be effective. The way that each pesticides attacks a pest suggests the best way to apply it; to reach and expose all pests.

Types of Pesticides

Insecticides are chemicals used to control insects. Often the word “insecticides” is confused with the word “pesticide.”  It is however, just one of my types of pesticides.  An insecticide may kill the insects by touching it or it may have be swallowed to be effective.  Some insecticides kill both by touch and swallowing. Insecticides called Systemic.  When the insect feeds on this plants or animal, it ingests the systemic chemical and is killed.

1. Broad Spectrum– Insecticides varies in the number of different kinds of insects they kill. Some insecticides kills only a few kind of insects. Sometime you can choose these insecticides when you wish to kill only one insect pest and not other beneficial insects in the area.  Many insecticides are general purpose or wide range killers.  These “broad spectrum” pesticides are used when several different kind of insects are a problem.  No broad spectrum insecticides kills all insects; each varies as to the kinds of insects it controls.

2. Narrow spectrum– 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 few group of insecticides are much more selective.  Growth regulators are even more specific.  They affect certain groups of species that have a particular hormone.

3. Pheromones- Pheromones are naturally produced chemical used by animals to communicate to each other.  There are three basic types of pheromones. Aggregation pheromones attract many individuals .  Trail pheromones are deposited by walking insects.  Synthetic pheromones produced in laboratories mimic these natural chemicals.  They are used to attract pest insect into disrupt mating, traps and populations of insects.  Because they do not kill insects, they are often not considered to be pesticides.

4. Miticides and Acaricides- Miticides (or Acaricides) are chemicals used to control mites and ticks.  The chemicals usually must contact the mites or ticks to be effective.  These animals are so numerous and small, that great care must be used to completely cover the area on which the mites live.  Miticides are very similar in action to insecticides and often the same pesticides kills both insects and mites.  The term “broad spectrum” and “residual” are also used.


Fungicides are chemicals used to control the fungi which caused rots, plant diseases and molds. All fungicides work by coming in contact with the fungus, because fungi do not “swallow” in the normal sense.  Therefore, most fungicides are applied over a large surface area to try directly hit every fungus.  Some fungicides may be systemic in that the plant to be protected may be fed or injected with the chemical.  The chemical then moves throughout the plant, killing the fungi, to describe miticides.  This type of fungicides is very useful when a particular disease or group of diseases are likely to attack a plant or crop, year after year.  Protectant, for example, have often been used as a routine precaution on fruit and vegetable crops.  Most protectant fungicides are fungi static.  Hits means they prevent or inhibit fungal growth.  Once the fungi static  action ceases, the controlled fungus may grow again or produce spores.  The other type of fungicides kills the disease after it appears on (or in) the plant.  These fungicides, called “eradicants,” are like penicillin or the other antibiotics which cure disease in human after the sickness appears.


Herbicides are chemicals used to control unwanted plants.  These chemicals are a bit different from other pesticides because they are used to kill or slow the growth of some plants, rather than to protect them.  Some herbicides kills every plant they contact, while other kill only certain plants.

1. Non-selective herbicides– These are toxic to all plants.  These are often used when no plants are wanted in an area.  For example, nonselective herbicides could be used for clearing under guardrails or for total control of weeds in industrial areas.
2. Selective herbicides– These kind of herbicides kills some plants with little or no injury to the other plants.  Usually selective type will kill either broadleaved plants or grassy plants.  Some very selective herbicides may kills only certain plants in a group; for example, crabgrass killers on lawns.  These are useful for lawns, golf courses or in areas with desirable trees.


Rodenticides are chemicals used to control rats, mice, bats and other rodents. Chemicals which control other mammals, bird, and fish are also grouped in this category by regulatory agencies. Most rodenticides are stomach poisons and are often applied as baits. Even rodenticides which act by contacting the pest are usually not applied over large surface because of the hazard to domestic animals or desirable wildlife. They are usually applied in limited areas such as runway, known feeding places, or as baits.

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