Page "Annual plant" Paragraph 11
from
Wikipedia
Even though they do not compete directly with cultivated plants, sometimes winter annuals are considered a pest in commercial agriculture, because they can be hosts for insect pests or fungal diseases ( ovary smut – Microbotryum sp ) which attack crops being cultivated.
Ironically, the property that they prevent the soil from drying out can also be problematic for commercial agriculture.
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