Health problems caused by weeds

Health Problems	Weed
Hay fever and Asthma	Pollen of Ambrosia and Franseria
Dermatitis (skin allergy)	Parthenium, Ambrosia
Itching and inflammation	Utrica sp
African sleeping sickness	Brush weeds
Malaria, encephalitis and filarial caused by mosquito	Aquatic weeds like Pistia lanceolate, Salvinia auriculata