Leeks and onions are occasionally attacked
by the Onion Fly, which is particularly troublesome in the larval stage, when
the maggots tunnel into the plant tissue. The Onion Fly, which looks like
a small grey house fly, lays its eggs in the spring and early summer, near
the base of the leek or onion, on the leaves and in the soil nearby. The
maggots are white and about half an inch (1.25 cm) long when fully grown.
onions, young leeks seem particularly vulnerable. Lift and destroy infested
plants. When lifting the infested plants, make sure there are no
maggots left lying on the ground, and because the flies are attracted to
the smell of fresh manure, make sure the leeks and onions are not planted on freshly
There are chemicals to treat
the soil where onion fly maggots are a big problem. These are readily
available at most garden centres and nurseries.
TO THE GARDEN PEST AND DISEASE MAIN PAGE FOR
PESTS AND DISEASES CLASSIFIED BY PLANT