Sentences with phrase «ragweed plants»

And soybean yield was reduced by 95 % in 2015 and 80 % in 2016 when common ragweed plants were grown only three inches apart in the soybean row.

A single giant ragweed plant can reduce the yield in an area holding 30 soybean plants by as much as half.

One ragweed plant every 1.6 feet of soybean row decreased soybean yield by 76 % in 2015, and by 40 % in 2016.

Butterbur is in the ragweed plant family, so people who are allergic to ragweed, marigold, daisy, or chrysanthemum should not use butterbur.

Not exact matches

And ragweed, one of the worst plants for allergies in the US, is invading Europe and beyond.

If you look at the chart above you'll see that the amounts of pollen ragweed produces only went up by 1 gram per plant in almost 20 years.

This gets even worse the closer plants are to sources of carbon dioxide — ragweed growing next to highways produces more potent pollen than ragweed growing away from large roads.

Ragweed pollen is the bane of many lives in the US, and climate change could help the plant become much more common in Europe by 2050

SAVANNAH, GEORGIA — The glut of humanmade carbon dioxide (CO2) that is spurring global warming may have an unwelcome side effect for hay fever sufferers: It could help ragweed flourish and crowd out other plants, ecologists say.

But in plots at the warm end of the tunnel that were also exposed to more CO2, ragweed (Ambrosia artemisiifolia), normally a cool - season plant, took over.

Within the experimental plots, ragweed density ranged from no plants (a weed - free control) to 12 plants per meter (about 39 inches) of the row.

They are Ambrosia trifida, or giant ragweed — a plant as ugly as its name and as useless, well, as its cousin, common ragweed, A. artemisiifolia, a machine for sucking up water and spewing out highly allergenic pollen.

People who are allergic to plants of the Asteraceae family (aster, ragweed, and chrysanthemums), as well as mugwort pollen, should avoid taking any supplement that contains chamomile.

In contrast, studies have shown that a large percentage of noxious weeds (such as crab grass, barn grass, ragweed, pampas grass, burrgrass, etc.) are C4 plants, which do not respond as strongly to increased CO2 levels as most crops, which are of the C3 variety.

Dr. Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture's Crop Systems and Global Change Laboratory, and colleagues at the National Allergy Bureau and Aerobiology Canada, analyzed ragweed pollen counts at ten monitoring stations along a south to north transect, from Texas north to Saskatchewan, Canada, from 1995 to 2009.

Changing distributions of temperature, precipitation, and carbon dioxide could affect the potency of plant allergens, 43 and there has been an observed increase of 13 to 27 days in the ragweed pollen season at latitudes above 44 ° N. 43

It is generally well tolerated, though in sensitive people it may actually cause headaches and allergic - type symptoms, especially in those who are allergic to ragweed, marigolds and similar plants.