Agricultural and environmental

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Some weeds are both environmental and agricultural, for example Blackberry.

 

Weeds can affect people’s health through reduction in the quality of drinking water or by poisoning. Symptoms of plant poisoning are rashes, hay fever, asthma and eye irritation. Weeds grow best in areas that have been disturbed usually through the actions of people. These actions include land clearing, road construction, cropping and bushfires.