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permitted
fungicides and pesticides
The
term 'natural' is inadequate to differentiate between the permissible
and the proscribed, as some of the most toxic substances known are
products of nature. Our attitude to 'chemical' inputs is that we
do not approve the use of any substance that is considered to be
persistently toxic, or that is likely to have measurable
effects
beyond the specific control of a pest or disease that presents a
serious and imminent threat to a crop. We do not expect our
growers to lose a crop rather than use a relatively benign treatment,
as long as customers are given accurate information.
Transparency
and traceability are integral to the WFA approach, as defined
by
the pledge and the open gate policy. This is particularly important
to people who are highly sensitive to certain chemicals, as they will
seek out local WFA produce in preference to distantly-sourced
'organic' because they can have direct contact with the grower and
ask questions.
Well-known
American organic gardener and writer Eliot Coleman, who has expressed
his support for the WFA, says,
"Don't
worry about pests. Relax, bugs are indicators, not enemies. They tell
us that something isn't quite right with our soil or growing
conditions.
If you keep the soil aerated and
fertile your plants will
be less stressed and they'll attract fewer pests. Pay attention to
your garden and learn from what it has to teach you. Look and see how
Mother Nature does things,
and take your cue from her. Share what you learn. Farmers and
gardeners shouldn't hoard secrets. An idea expands when different
growers try it out. Information is like compost; it does no good
unless you spread it around."

These are the
treatments we currently consider to be acceptable for
emergency
use only:
Sabadilla
is derived from the seeds of the sabadilla lily
(Schoenocaulon
officinale). The active ingredient is an alkaloid known as veratrine.
Sabadilla is considered among the least toxic of botanical
insecticides.
Pyrethrum
is a widely used botanical insecticide. The active
ingredient,
pyrethrin, is extracted from the chrysanthemum plant, Dendranthemum
cinerariaefolium, grown primarily in Kenya, Rwanda, Tanzania and
Ecuador.
Neem
is a botanical pesticide derived from the seeds of the
neem tree,
a native of India. The neem tree supplies at least two compounds,
azadirachtin and salannin, that have insecticidal activity, and other
unknown compounds with fungicidal activity. Neem has been used for
more than 4,000 years in India and Africa for medicinal as well as
pest control purposes.
Sulphur
is probably the oldest known pesticide in current use.
Homer
described the benefits of pest-averting sulphur 3,000 years ago.
Sulphur can be used as a dust, wettable powder, paste or liquid. It
is used for disease control because it is effective against powdery
mildews, certain rusts, leaf blights and fruit rots. However, spider
mites, psyllids and thrips also are susceptible to sulphur.
Lime
sulphur is made by boiling lime and sulphur
together. This
mixture is used as a dormant spray for fruit trees to control such
diseases as blight, anthracnose and powdery mildew, and certain
insects such as scales, eriophyid mites and spider mites.
Bordeaux
mixture is a product of the reaction between copper
sulphate
and calcium hydroxide (lime). It is not approved for use by organic
growers. First used in Bordeaux, France, as a control for downy
mildew, this mixture is primarily used as a fungicide to control
bacterial leaf spots, blights, anthracnose, downy mildews and
cankers.
The following
are not limited to emergency use only
Horticultural
oils are highly refined so that compounds toxic to
plants are
removed. Considered effective and safe, they can be used to control
insects as well as diseases.
Soaps
have been used for 200 years or more and are effective
against
soft-bodied
insects such as aphids, some scales, psyllids, whiteflies, thrips,
mealybugs and spider mites.
Baking
soda (sodium bicarbonate) has been found to have
fungicidal
properties. Researchers at Cornell University discovered that a
combination of baking soda and Sunspray horticultural oil applied to
rose leaves infected with powdery mildew or black spot will
significantly reduce the incidence of disease.
Diatomaceous
earth (DE) is a non-toxic insecticide mined from
the
fossilized silica shell remains of diatoms. Diatoms are single-celled
or colonial algae in the class Bacillarophyceae.

click on
the lettuce to read about the history of the WFA |