Experts have long warned that weeds may compete with cultivated crops for nutrients and water.
But now research by a team from Washington State University and the United Kingdom has found that weeds may reduce the amount of plant-based nutrients in raspberries, according to a news release.
WSU weed scientist Tim Miller worked with fruit researchers in the United Kingdom last summer on a series of trials that examined weeds and herbicides and their relationship to plant-based or phytonutrients.
The UK team had already developed a method to measure the amount of several compounds in raspberries and black currants, two fruits that have been dubbed superfruits because of large amounts of antioxidants.
The 2012 trial in Scotland linked some hard-to-control weeds, such as broadleaf dock, fireweed and quackgrass, to reduced sugar, vitamin C, color and juice content in the berries.
Miller will travel to Scotland again this year.
And the trials will be repeated this year to determine whether environmental responses during 2012 may have affected the outcome or whether the quality factors respond the same two years in a row.
“A better understanding of the potential effects of management decisions will give growers one more tool to improve not only the yield of their fruit, but also the quality of those fruits for consumers,” Miller said in the release.