You should know about Advantages and disadvantages of chemical pesticides

Chemical pesticides are often used to control diseases, pests or weeds. Chemical control is based on toxic (poisonous) substances for the pest in question. When chemical pesticides are applied to protect plants from pests, diseases or the excessive growth of weeds, we talk about phytosanitary products. Of course, it is important that the plant that requires protection does not suffer from the toxic effects of the product used.

Efforts to protect crops began centuries ago. Around 1200 BC, the Chinese used lime and ash to destroy the parasites. The Romans, on the other hand, used sulfur and bitumen, a substance derived from crude oil. Substances such as tobacco nicotine were used since the sixteenth century and, later, also copper, lead and mercury. After the Second World War, the use of chemical pesticides began and, nowadays, there are hundreds of them available for use in agriculture and also in horticulture.

Pesticides are grouped into five main categories, according to the purpose for which they are normally applied. The first groups are fungicides, used to fight fungi. Then there are the herbicides, which are used against weeds. The herbicides are absorbed by the leaves or roots of the herb, and destroy it. Another group is insecticides that, as the name implies, destroy harmful insects.
The use of chemical pesticides has become widespread due to its relatively low cost, its ease of application and its effectiveness, availability and stability. Chemical pesticides are generally fast acting, which limits crop damage.

Chemical pesticides have some important disadvantages; however, they are still widely sold and used. In this article we will discuss three of the disadvantages of chemical pesticides. First, chemical pesticides are often not only toxic to the organisms for which they were conceived, but also to other organisms. Chemical pesticides can be subdivided into two groups: non-selective pesticides and selective pesticides. Non-selective pesticides are the most dangerous, because they kill all kinds of organisms, including harmless and useful species. For example, there are herbicides that kill both broadleaf weeds and grasses. This means that they are not selective, since they destroy almost all the vegetation. Selective pesticides have a more restricted scope. They only destroy the plague, the disease or the weed, without affecting other organisms. As an example we can name a herbicide that acts only on broadleaf weeds, so it can be used on the lawn already, which does not kill the grass. Nowadays, usually, a combination of several products is required for the control of several pests, since almost all the allowed products are selective and, therefore, only control a certain range of pests.

Another disadvantage of chemical pesticides is resistance. Pesticides are usually effective only for a (short) period of time for a particular organism. Organisms can develop immunity to a certain substance, losing its effect. These organisms mutate and become resistant, which results in the need to use other pesticides for their control.

A third drawback is the accumulation. If the sprayed plants are attacked by an organism, and that organism is eaten by another, the chemicals can enter the food chain. Animals that are at the top of the food chain, usually predators or humans are at increased risk of poisoning due to the accumulation of pesticides in their system. This effect, however, is becoming less relevant because pesticides are forced to degrade more rapidly so that they cannot accumulate. Otherwise, its sale is prohibited.

In most countries the pest control industry has been dogged by a few bad practitioners who have tarnished the reputation for the highly professional and responsible majority. You can also visit on to get Singapore pest control service.

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