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* They kill unwanted plants. * They can be safely used whereas in some cases manually removing weeds can destroy the crop. * Herbicides can be used on closely planted crops where other methods cannot be used. * Most of the time one application of the herbicide is enough whereas other methods have to be continually used. * They are easy to use * They work fast. They can be removed quickly in critical situations. * Herbicides are relatively cheap, and most of the time cheaper than manual weeding. * Non-selective herbicides can effectively clear fields, where houses and roads can then be built. * They can destroy plants bearing diseases. * They help the crops grow by destroying the weed that is robbing the crops water, nutrients and sunlight. * They are relatively safe on lands which may erode. * Some are biodegradable, and become relatively harmless after decay. * Some herbicides are non-biodegradable and are harmful for a long period of time. * They are all slightly toxic. * They can cause illnesses. Glyphosate, a herbicide, can cause eye and skin problems and upper respiratory effects in the user. Paraquat can cause irritations to the skin and may also lead to death, accidental and even suicidal. Many other diseases and illness can be caused such as cancer, nausea, headaches, chest pains, and fatigue. * The can be carried into streams by runoff rainwater or leached into underground water supplies polluting them. * Herbivores may eat the plants treated with herbicides and then carnivores eat the herbivores. The toxic herbicide would be passed up the food chain increasing in concentration each time resulting in cancers and even deaths.

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15y ago
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9y ago

Herbicides may be helpful to farmers as they help control weeds. However, their chemical content may cause degradation of the environment in one way or another.

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12y ago

There is no disadvantage in using fungicides but then Im not a yougurt knitting liberal.

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13y ago

It can harm the wildlife.

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13y ago

honestly, loads of people CARE

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Wiki User

9y ago

to kill weed

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Wiki User

9y ago

Go to hell

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Q: What are the disadvantages of using fungicides?
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