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Pesticides are a combination of two or more compounds used to kill pests. They're utilized to get rid of pests by killing or poisoning their prey. Certain things are considered pests if they obstruct our access to food, transmit disease, hurt the environment, or cause property damage. Herbicides are pesticides that are used to kill weeds (a non-intentionally seeded plant that is out of place) and other undesirable plants. Chemical herbicides provide a number of advantages over mechanical weed control, including simplicity of application, which can save money on labor. Mosquitoes, ticks, rats, and mice are among the pests and disease vectors that pesticides are used to suppress. In agriculture, pesticides and herbicides are used to manage weeds, insect infestations, and illnesses.
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Key Takeaways: weeds, insecticides, bacteria, microbes, pests, fungi, biodegradable, selective, non-selective.
Pesticides
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Pesticides are a broad term that covers a wide range of natural and synthetic (or man-made) pesticides used in food and agriculture to kill "pests." While most of us associate pests with animals' insects, rodents, and so on other living entities such as weeds, fungus, and bacteria may be just as damaging to crops, as problematic to farmers, and just as deserving of the label "pest." Herbicides, fungicides, and insecticides are all referred to as pesticides because of this.
Pesticides
Effects of Pesticides
Pesticides can have acute, or short-term, negative health impacts, as well as chronic, or long-term, negative health consequences that can develop months or years after exposure. Stinging eyes, rashes, blisters, blindness, nausea, dizziness, diarrhea, and death are examples of acute health impacts. Cancers, birth defects, reproductive damage, immunotoxicity, neurological and developmental toxicity, and endocrine system disturbance are examples of recognized chronic consequences.
Some persons are more sensitive to the effects of pesticides than others. Pesticides, for example, are known to be more harmful to newborns and early children than they are to adults. Because they are exposed to more pesticides, farmworkers and pesticide applicators are more vulnerable.
Types of Pesticides
These are divided into various categories based on the pests they kill:
- Insecticides are chemicals that kill insects.
- Plant-based herbicides
- Rodenticides are used to kill rodents (rats & mice)
- Bactericides are substances that kill bacteria.
- Fungicides are chemicals that kill fungus.
- Larvicides are larvae killers.
These are categorized according to how biodegradable they are:
- Biodegradable: Biodegradable materials are those that can be broken down into harmless chemicals by microorganisms and other living organisms.
- Persistent: These are the ones that might take months or even years to break down.
These are categorized according to their relation with chemicals:
- Organophosphate: the majority of organophosphates are pesticides.
- Carbamate: it disrupts an enzyme that modulates a neurotransmitter, which has an effect on the neurological system.
- Organochlorine insecticides
- Pyrethroid: This is a synthetic form of pyrethrin, a pesticide found naturally in chrysanthemums (Flower).
- Sulfonylurea herbicides: Sulfonylurea herbicides are weed killers that have been marketed.
- Biopesticides: pesticides originating from natural elements such as animals, plants, microbes, and minerals are known as biopesticides.
Herbicides
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Herbicides are chemicals that are used to control or manage unwanted plants. Herbicides are most often used in row-crop farming, where they are treated before or during planting to increase crop yield while reducing other vegetation. They can also be used on crops in the fall to help with harvesting. In forest management, herbicides are used to prepare logged areas for replanting.
Herbicides are applied to lawns, parks, golf courses, and other locations in suburban and urban regions. Herbicides are used to manage aquatic weeds in bodies of water. These weeds can obstruct irrigation withdrawals and interfere with recreational and industrial water uses.
Herbicides
Effects of herbicides
Crop plants may be harmed if herbicides are not applied correctly, particularly if too high a dose is used or spraying happens during a time when the crop species is susceptible to the herbicide. Unintentional but economically significant agricultural plant damage might occur as a result of incorrect pesticide application.
Furthermore, the usage of herbicides has some significant environmental consequences. These include unexpected harm that occurs both on and off the sprayed location. Herbicide usage, for example, alters the habitat of species such as mammals and birds by modifying the vegetation of treated locations. There are also worries regarding the toxicity of various herbicides, which may impact workers who use these chemicals as part of their job (for example, while spraying pesticides), people who are exposed indirectly through drift or residues on food, and wildlife.
Types of herbicides
Herbicides are classified into two types: selective and non-selective. The former is used to prevent the growth of a specific weed while leaving other plants alone. The non-selective variations harm any plants with which it comes into contact.
- Selective herbicides: This chemical is designed to be particularly toxic to only a few types of plants, such as grass and broadleaf weeds. It is not, however, hazardous to other plant species. When using selective herbicides, it's critical to check the product label to ensure it targets the plants you want to get rid of. The dosage and time of application determine the effectiveness of its use.
- Non-selective herbicides: This variety is meant to kill a wide range of weeds and plants, therefore it's best to use it sparingly around walks, patios, gardens, and bare soil to keep weeds at bay. It has two modes of action: contact and systemic.
Difference between pesticides and herbicides
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The differences between pesticides and herbicides are as follows:
| PESTICIDES | HERBICIDES |
|---|---|
| Pesticides are commonly classified as chemicals, biological agents, antimicrobials, or disinfectants. | Herbicides, like fungicides, rodenticides, nematicides, and algicides, belong to the pesticide category. |
| They're made to keep pests away by repelling, controlling, attracting, and eventually killing them. | They are used in industrial areas to manage or prevent unwanted plants or weeds of all kinds. |
| Pesticides have a broader definition and can refer to several different types. | Herbicides are classified into two types: selective and non-selective. |
| Examples are bug sprays, insect repellents, weed killers, ammonia, paint additives, etc. | Examples are Metribuzin, Dacthal, sodium chloride, sodium arsenite, etc. |
Also read: Agricultural Chemistry
Things to remember
- Pesticides are a combination of two or more compounds used to kill pests.
- Insects, plant infections, weeds, mollusks, and other organisms that harm plant crops and transmit illness are examples of pests.
- Insecticides, herbicides, fungicides, rodenticides, nematicides, and algicides are some of the pesticides.
- Herbicides are pesticides that particularly target weeds and other undesirable plants.
- Herbicides are frequently used in industrial areas, railways, waste disposal sites, and farms. Pesticides are used in practically every industry.
Sample Questions
Ques: What are pesticides? [5 marks]
Ans: Pesticides are compounds or a mixture of substances that are primarily employed in agricultural or public health protection programs to protect plants from pests, weeds, or illnesses, and humans from vector-borne diseases such as malaria, dengue fever, and schistosomiasis. Insecticides, fungicides, herbicides, rodenticides, and plant growth regulators are common examples. These products are also used for non-agricultural applications, such as improving and maintaining public urban green spaces and sports grounds.
Ques: What are the benefits of using pesticides? [5 marks]
Ans: The benefits of using pesticides include:
- Pesticides enable farmers to produce more while using less land.
- Pesticides guarantee bountiful crops.
- Pesticides contribute to the affordability of food.
- Pesticides aid in the reduction of waterborne and insect-borne diseases.
- Pesticides aid in environmental preservation.
- Herbicides have made manual weeding useless.
- Pesticides have helped underdeveloped nations become food producers.
Ques: What are the effects of pesticides? [5 marks]
Ans: Pesticides can have both acute (short-term) and chronic (long-term) health consequences, which can occur months or years after exposure. Eye stinging, rashes, blisters, blindness, nausea, dizziness, diarrhea, and death are all examples of acute health impacts. Cancers, birth defects, reproductive damage, immunotoxicity, neurological and developmental toxicity, and endocrine system disturbance are examples of recognized chronic consequences.
Ques: What are herbicides? [5 marks]
Ans: Herbicides are pesticides that are used to alter or control unwanted plants. Herbicides are most commonly used in row-crop farming, where they are administered prior to or during planting to improve crop yield while limiting other vegetation. They can also be used on crops in the fall to promote harvesting. When using herbicide in the garden, take precautions to safeguard the plants you do not want to destroy. If you've identified your weed, you might be able to find a selective herbicide that will kill it while leaving your garden plants alone.
Ques: What are the types of herbicides? [5 marks]
Ans: Herbicides used to destroy unwanted plants are of two types:
- Selective herbicides: It kills some weeds while leaving other plants alone. The pesticide label identifies the weeds that are targeted as well as the garden plants that are not harmed.
- Non-selective herbicides: They can destroy practically any plant. When starting a new garden, non-selective herbicides make it simple to clear an area.
Ques: What are herbicides used for? [5 marks]
Ans: The uses of herbicides are as follows:
- An herbicide is a chemical that is used to destroy undesired vegetation.
- Selective herbicides destroy particular targets while causing little damage to the intended crop. Some of them work by interfering with weed development and are frequently based on plant hormones.
- Herbicides used to remove waste ground are nonselective, killing all plant material that comes into contact with them.
- Some plants, such as the genus Juglans, generate natural herbicides (walnuts). They are used in total vegetation control (TVC) programs for highway and railroad maintenance.
- Smaller volumes are employed in forestry, grazing systems, and wildlife habitat management.
- Herbicides are frequently employed in agriculture and grass management in landscapes.
Ques: What are the effects of herbicides? [5 marks]
Ans: Herbicides have high toxicity to target species, but they can also be hazardous to non-target species, such as humans, at varying amounts. Herbicides have the potential to harm organisms and human health through both direct and indirect action. Among the biological impacts of these substances include genetic harm, various physiological changes, and even the death of the creatures exposed. Some herbicides, even at low doses, may not have immediately noticeable impacts on organisms but can diminish their lifetime length in the long run. Herbicides can have a variety of effects on organisms.
Ques: Mention some of the chemical pesticides? [5 marks]
Ans: Some of the chemical pesticides are:
- Organophosphate: The vast majority of organophosphates are insecticides.
- Carbamate: it destroys an enzyme that controls a neurotransmitter, which has an influence on the nervous system.
- Organochlorine insecticides
- Pyrethroid: It is a synthetic version of pyrethrin, a pesticide found naturally in chrysanthemums (Flower).
- Sulfonylurea herbicides: Sulfonylurea herbicides are commercial weed killers.
- Biopesticides: These are pesticides derived from natural materials such as animals, plants, microorganisms, and minerals.
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