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- Some weeds are poisonous to livestock.
- Water weeds block irrigation channels.
- Some weeds are parasitic to crops.
- Weeds compete with crops for nutrients, light and water.
- Some weeds lower the quality of agricultural products.
- Some weeds are allelopathic.
- Some weeds are alternate. Hosts for pests, insects etc.
- Some weeds irritate workers reducing efficiency.
john3 answered the question on January 12, 2018 at 14:32
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