The insects feed on some of the weeds and act a form of weed control; more weed control can be accomplished by using weeds as a source of food for pets such as rabbits and human consumption. Luckily, all a farmer needs to do is invest in great outdoor rabbit hutch plans and build a nice home for their pet rabbits for easy access to the weeds and for easier feeding.
For example, in the control of wasps, a farmer can utilize a wasp trap
Insects are so important in farming that a new trend of bug hotel is growing
Sourced from: http://www.no-dig-vegetablegarden.com/beneficial-garden-insects.html
The benefits of insects to a gardener are unparalleled especially for a farmer who has information and understanding
Also, the dead bodies and droppings of the insects serve as fertilizer.
5. Insects perform a valuable service as scavengers by devouring the bodies of dead animals and plants and by burying carcasses and dung.
Sourced from: http://www.mastergardenproducts.com/sustainablelandscape/beneficialinsects.htm
More importantly, it is best to control rather than use chemical insecticides and pesticides to kill insects
Sourced from: http://www.planetnatural.com/beneficial-insects-101/
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