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Ambrosia artemisiifolia pollen. Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, [11] [12] and the pollen is transported on the wind. It causes about half of all cases of pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. [8]
If feasible, avoid going outside on high pollen count days, especially in the early morning or midday. While inside, close your windows and have the air conditioning running.
A multiple-vortex tornado outside of Dallas, Texas on April 2, 1957. Since Dallas lies at the lower end of the "Tornado Alley", tornadoes have on occasion been a threat to the city. Most tornadoes hit the city during the months of April and May. [15] Dallas was hit by a powerful tornado on April 2, 1957; the tornado was later rated F3. [16]
Grass pollen will start around this time, compounding hay fever (pollen allergy) symptoms. Weeds don't start until the late summer and early fall, making back to school season potentially even ...
Common ragweed is a very competitive weed and can produce yield losses in soybeans as high as 30 percent. Control with night tillage reduces emergence by around 45 percent. Small grains in rotation will also suppress common ragweed if they are overseeded with clover. Otherwise, the ragweed will grow and mature and produce seeds in the small ...