Bulletin 151, Truck and Garden Insects


of cabbage, cauliflower, collards, turnips, mustard, and other
plants of this family during the summer or early fall. All
wild crucifers in or near the field should be destroyed. In an
infested field of onions or cabbages all refuse of the crop should
be pulled and burned as soon as the crop is harvested.
 Several of the Northern stations report success in poison-
 ing the flies of the onion root-maggot before they have had op-
 portunity to lay many eggs. The following poisoned bait was
 prescribed by the Wisconsin Station. Five grams of sodium
 arsenite are dissolved in a gallon of boiling water and a pint of
 cheap molasses added. This solution is sprayed on the plants
 with a coarse nozzle so that it will fall in large drops. It must
 be renewed after every heavy rain or once a week in dry
 weather. Another method is to distribute the poison in from
 15 to 20 small pans for each acre of onions. These need to be
 renewed only after heavy rains or when dried out. During the
 dry weather of the average spring this method would probably
 be more economical than spraying.

 OTHER ONION PESTS
 Other insects attacking onions are: Fall army worm (see
under corn, page 155) ; wireworms (see under corn, page 153);
and cutworms (see under cabbage, page 137).

 PARSLEY
 Two insects attack this crop quite commonly in Florida.
They are: Celery worm (see celery caterpillar, page 150), and
cutworms (see under cabbage, page 137).

 PEAS
 Peas, or English peas, also sometimes called garden peas,
are attacked by about the same pests as the sweet, or flowering,
peas. Their pests are discussed here. Cowpeas, or field peas,
are sometimes called peas. Their pests are discussed under the
heading of cowpeas in an earlier part of this bulletin.
 PEA-APHID (Macrosiphum pisi)
 This green plant-louse is much larger than the garden
aphid, measuring 3/16 of an inch long. They collect on the
young and tender portions of the vines near the growing tip
which they may cover completely. They commonly collect also
in the bud where they are concealed by the bracts.