Untreated Treated Untreated Untreated Treated

• Onion maggots feed only on plants in the onion family. • Untreated onion rows are often completely destroyed by onion maggots while insecticide treated plants are 99 % free of maggots. • Onion thrips infest onion acres throughout the U.S. • Feeding by onion thrips can reduce yield by 50%. Technical Summary The onion is of European origin. Onion is mentioned as being under cultivation in America as early as 1629. Growers in thirteen states produce 6.9 billion pounds of onions with a value of $824 million from 174,000 acres annually. 95-99 % of onion acres in northern states (MI, NY, OR, WA, WI) are treated with insecticides while 50-80 % o