Ragweed (Ambrosia psilostachya) pollen,coloured scanning electron micrograph (SEM).This pollen is allergen.Ragweed is main cause of weed allergies.Ragweed pollen is notorious for causing allergic reactions in humans,specifically allergic rhinitis.Up to half of all cases of pollen-related allergic

- Image ID: HJ0BGR
Ragweed (Ambrosia psilostachya) pollen,coloured scanning electron micrograph (SEM).This pollen is allergen.Ragweed is main cause of weed allergies.Ragweed pollen is notorious for causing allergic reactions in humans,specifically allergic rhinitis.Up to half of all cases of pollen-related allergic
Science Photo Library / Alamy Stock Photo
Image ID: HJ0BGR