[A]
[B] [C] [D]
[E] [F] [G]
[H] [I-J-K] [L]
[M-N] [O-P] [Q-R]
[S] [T] [U-V]
[W-X-Y-Z]
watershed See catchment.
water dispersible granule (WG)
Formulation containing granules which readily disperse in water
to form a suspension. (GIFAP, 1989).
water dispersible powder (WP)
Pesticide in a dry form with surfactant, often mixed with,
or coated on, a fine solid carrier, for dispersion in water to form a suspension.
(GIFAP, 1989).
water soluble powder Powder
formulation to be applied as a true solution of active
ingredient after mixing with water, but which may contain insoluble
inert ingredients. (GIFAP 1989).
wettable powder See water
dispersible powder.
wetting agent Surfactant
for use in spray formulations to assist dispersion of a powder in the
diluent or spreading of spray droplets
on surfaces. May also incorporate functions of a sticker.
withholding period Minimum permissible
time between the last application of a pesticide to a crop (including
pasture) and harvesting for human consumption or grazing with livestock.
The minimum permissible time between the final application of a pesticide
to an animal and the collection of eggs or milk, or slaughter, for human
consumption. See also pre-harvest
interval.
xenobiotic substance Natural or synthetic
compound which is present in an organism but is not a natural component
of that organism. Common usage is for man-made environmental contaminants
in organisms. (Nagel, et al 1992)
xylem Part of the plant's vascular
system adapted to the transport of water and solutes from the roots
to aerial parts.
zero tolerance Limit for a pesticide
residue in food or feed which is assumed to be zero and therefore any
detectable residue is deemed illegal. Zero tolerances are used by some
regulatory systems, e.g. USA, where no maximum residue limits have been
established for particular pesticide/crop combinations.
> Synopsis
> Preface
> References
