4. What are pesticides? Discuss their classification, commonly in use with agronomists.

some important related topics are also included in this page .

Agronomy:The science and study of crops and soils.


pesticides:pest-killing compound: a chemical substance used to kill pests, especially insects.

What are pesticides?Pesticides (or farm chemicals, agro chemicals or agvet chemicals) are those substances which are used to control, destroy, repel or attract pests in order to minimise their detrimental effects. Pests are those organisms like weeds, insects, bacteria, fungi, viruses and animals which adversely affect our way of life. Pests can reduce the quality and quantity of food produced by lowering production and destroying stored produce; they can harm our animals (like fleas, worms and diseases); they compete with humans for food and affect the health, welfare and way of life of people; they can destroy buildings (termites) and are a major cause of land degradation (noxious weeds, rabbits, feral pigs, etc). Pests are also a major nuisance around our homes (prickles in the lawn, flies,etc). Pest activity greatly increases the costs of farming.



Pesticides therefore are used in many situations such as livestock farming, cropping, horticulture, forestry, home gardening, homes, hospitals, kitchens, roadsides, recreational and industrial areas. They are a vital facet of farming and our everyday life


Pest Control, any of a wide range of environmental interventions that have as their objective the reduction to acceptable levels of insect pests, plant pathogens, and weed populations. Specific control techniques include chemical, physical, and biological mechanisms.


Compendium of Pesticide Common NamesClassified Lists of Pesticides


Acaricides :a substance that kills mites or ticks

Algicides
Antifeedants : Any substance that inhibits normal feeding behaviour
Avicides :An avicide is any substance (normally, a chemical) which can be used to kill birds.
Bactericides
Bird repellents
Chemosterilants :A chemosterilant is a chemical compound that causes reproductive sterility in an organism. They may be used to control pest populations by sterilizing males.

Fungicides
Herbicide
safeners
Herbicides
Insect attractants
Insect repellents
Insecticides
Mammal repellents
Mating disrupters
Molluscicides
Nematicides
Plant activators
Plant growth regulators
Rodenticides
Synergists
Virucides
just name some of the above said pesticides, eg Herbicide,Fungicides ,Insect repellents

for their defination see this link.http://www.alanwood.net/pesticides/glossary.html