Why are weeds unwanted in crop farms 1 They serve as hosts for crop diseases or provide shelter for ...........

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Why are weeds unwanted in crop farms?

1.They serve as hosts for crop diseases or provide shelter for insects to overwinter.

2.They compete with the crop for nutrients and water.

3.They reduce crop quality by contaminating the commodity.

Select the correct answer using the codes below.

1 and 2 only

2 and 3 only

1 and 3 only

1 , 2 and 3

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Explanation:

Weeds posses one or more of the following:

abundant seed production; rapid population establishment; seed dormancy;
Weeds are troublesome in many ways. Primarily, they reduce crop yield by competing for water, light, soil nutrients, and space. Other problems associated with weeds in agriculture include:
reduced crop quality by contaminating the commodity; interference with harvest;
serve as hosts for crop diseases or provide shelter for insects to overwinter; limit the choice of crop rotation sequences and cultural practices; and
production of chemical substances which are toxic to crop plants (allelopathy), animals, or humans

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