Disadvantages of Pesticides
- Reduction of beneficial species: Animals which interact with the targeted pest can also be affected by he chemical application. The reduction in these other organisms can result in changes in the biodiversity of an area and affect natural biological balances.
- Drift of sprays and vapour: Pesticides can affect other areas during application and can cause severe problems in different crops, livestock, waterways and the general environment. Wildlife and fish are the most affected. Taking special note of weather conditions can reduce drift.
- Residues in food: There is the possibility of pesticides in human food, either by direct application onto the food, or by bio-magnification along the food line. Not all levels are undesirable but unnecessary and dangerous levels must be avoided through good agricultural practice.
- Ground water contamination: Chemicals can reach underground aquifers if there is persistent product use in agricultural areas.
- Resistance: Overuse of the same pesticide can encourage resistance in the target pest.
- Poisoning hazards: Pesticide operators can risk poisoning through excessive exposure if safe handling procedure are not followed and protective clothing is not worn. Poisoning risks depend on dose, toxicity, duration of exposure and sensitivity.
- Other possible health effects: As pesticides used now have been through rigorous testing, most health problems stem from misuse, abuse or overuse.
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