Spraying pesticide. Farmer spraying a maize (Zea mays) crop with pesticide. Maize is the world's most important crop. It is a staple food for hundreds of millions in the Americas, Africa and Europe. Pesticide sprays are used to kill any pests, such as insects or fungi, that may damage the crop and reduce its yield. Many pesticides are harmful to humans and the environment. Protective clothing should be worn during spraying, and traces of the chemicals monitored in food products. The affect of spraying on non- target organisms should also be carefully monitored. Photographed in Oaxaca State, Mexico.

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