What are herbicides in agriculture?
Herbicides are a broad class of pesticides that are used to remove nuisance plants, such as grasses and weeds, that may compromise the growth and yield of desired crops that are in close proximity.
What are the different types of herbicides?
Basically, there are two main types of herbicides – selective and non-selective. The former is used when inhibiting the growth of a specific weed, leaving the other plants unharmed. The non-selective variants kills all the plants it comes in contact with.
What are the three main types of herbicides?
Selective herbicides are used to kill weeds without significant damage to desirable plants. Nonselective herbicides kill or injure all plants present if applied at an adequate rate. Herbicides provide a convenient, economical, and effective way to control weeds.
What is a translocated pesticide?
Translocated herbicides enter the plant and then circulated around to all parts, including the roots. This type of herbicide is used when targeting perennial plants to completely kill the whole plant. Examples of translocated herbicides are glyphosate and MCPA.
What is herbicides and pesticides?
Herbicides are normally designed to kill or control specific type of pests. Pesticide is generally used to kill or repel pests of all types, including insects and occasionally plants. Herbicides come in two forms: selective or non-selective.
What are insecticides?
Insecticides are chemicals used to control insects by killing them or preventing them from engaging in undesirable or destructive behaviors. They are classified based on their structure and mode of action. A broad-range insecticide, generally the most toxic of all pesticides to vertebrates.
What are the types of insecticides?
Based on the chemical nature, insecticides are classified into four groups:
- Organic insecticides.
- Synthetic insecticides.
- Inorganic insecticides.
- Miscellaneous compounds.
What are the two types of herbicide?
Modern weed killers are put in two categories: selective (affecting specific plant species) and nonselective (affecting plants generally). These, in turn, are classified as foliage-applied and soil herbicides.
What is the difference between contact and translocated herbicides?
Contact Herbicides:A herbicides which kills only those plants or retards the growth of those plants which comes in direct contact. 4. Translocated Herbicides:The herbicides which are absorbed by the one part of the plants and exert a toxic action to other parts.
What is atrazine herbicide?
Atrazine is an herbicide widely used for control of broadleaf and grassy weeds. It is sprayed on row crops such as corn, sorghum and sugarcane, and in some areas is used on residential lawns. It has also been used on highway and railroad rights-of-way. EPA now restricts how atrazine can be used and applied.
How are herbicides different from insecticides?
Herbicides are used to kill weeds in yards and flower beds, but insecticides are used to kill insects and worms that infect plants. Insecticides can also be used to kill small pests, like termites and ants, which invade the house, while herbicides are essentially used to destroy weeds.
What are systemic herbicides?
Systemic herbicides, also known as translocated herbicide are combinations of chemicals that are applied to the vegetative parts of a weed and are absorbed to the phloem and xylem tissue where they act in destroying weeds. Systemic herbicides are different from contact in that they follow a slow process of action.
How do herbicides help farmers control weeds?
Farmers use a variety of weed management solutions to control weed growth and herbicides are one of the tools farmers depend on to fight invasive plants in their fields. Herbicides are often used before planting to help clear a cover crop or weeds, and after planting, e.g. when used in conjunction with safeners or herbicide-tolerant crops.
What is the formulation of an herbicide?
The formulation of an herbicide refers to the material it is carried in or on, and its concentration in that carrier. Every herbicide product is a combination of active ingredients and inert ingredients. The same herbicide can be available in more than one formulation. The first way in which formulations are classified is LIQUID or DRY.
How often are herbicides used in agriculture?
Herbicide application occurs most frequently in row-crop farming, where they are applied before or during planting to maximize crop productivity by minimizing other vegetation. They also may be applied to crops in the fall, to improve harvesting. Figure 1. Agricultural use of herbicides in 2001 in millions of acres.