Pest Control

2. Substance that kills weeds that compete with agricultural crops for energy.
4. Substance that kills insect pests that eat and damage crops.
5. Substance used to kill unwanted organisms.
6. Substance that kills fungal infections that damage agricultural crops.
7. Increasing concentration of a pesticide or other chemical as it is passed along a food chain.
8. May produce strains of the pest that are resistant to a pesticide.
10. Competition between the crop plants and plants of other species growing in the field.

1. Means they only kill on pest species.
3. Competition between individual crop plants growing together for light, water and inorganic ions.
9. Means they kill many different species.
11. Can use these along with natural predators to keep numbers of pests low.
12. Organisms that reduce the productivity of crops by reducing the amount of energy available for growth.