An agrochemical or agrichemical, a contraction of agricultural chemical, is a chemical product used in agriculture. 

In most cases, agrichemical refers to pesticides including insecticides, herbicides, fungicides, and nematicides.

Criteria for choosing a pesticide include:

• Questions to ask include what is the toxicity level of the pesticide (measured by LD50--the higher the LD50 number, the less toxic).
• Try to avoid getting broad-spectrum pesticides that have the potential to kill or harm many beneficial species.
• Choosing a pesticide should be determined based on circumstances.
• Compare cost, read product reviews, ask for support and warranty things. 

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