Monday, February 20, 2012

5.4 understand the reasons for pest control and the advantages and disadvantages of using pesticides and biological control with crop plants

5.4 understand the reasons for pest control and the advantages and disadvantages of using  pesticides and biological control with crop plants

Pests are an annoyance to people wanting to produce large amount of crops. These include weeds, insects and moulds

Advantages
Reduces the number of insects which eat the crops, resulting in higher crop yield. Also helps stop the spread of disease in crops. This is also a very easy alternative to biological control which is much more complicated

Disadvantages
Can cause a problem in the food chain, for example if many insects eaten by birds are poisoned, then the birds will then be poisoned and this will lead on and on. Furthermore, some pesticides can affect humans. DDT is dangerous, and doesn't degrade easily.

Biological control is similar to pesticides in respect that it is intended to get rid of pests and disease. One example of biological control would be releasing lots of ladybugs into a group of crops to kill insects which the ladybugs feast on. This doesn't cause any harm to the crops and avoids pesticides completely.

4 comments:

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