WHITEFLIES
Whiteflies look just like a housefly
except they are only about 1/5-1/10 the size
and are all white. They fly around the plants
when they are disturbed. Whiteflies are
susceptible to pyrethrum, but the best
control is with Trichogamma wasps, which
get them under control in just a few weeks.
Trichogamma wasps are about ¼ the
size of a white fly and are harmless to
humans and pests but not to whiteflies.
They parasitize the larger whitefly egg,
laying their egg inside it. Once released
they fly around and live in the garden but
are rarely seen. Until wasps are introduced
the aphid population is kept in check using
pyrethrum sprays. The wasps are
susceptible to sprays so growers do not
spray for several days before release.