Definition of terms

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W

Name Description Related terms
waiting period
warning statements

General warning statements and precautions required for safe handling and use of specified chemicals. General warning statements are listed in Appendix F of the Standard for the uniform scheduling of medicines and poisons .

warrant(s)

From s. 3 of the Agvet Code:

Means a monitoring warrant or an investigation warrant.

water conditioner

An additive that typically removes ammonia, nitrites, nitrates, chlorine and chloramines from the water.

water hardness

The extent to which a water sample contains high levels of calcium and magnesium ions that bind with amine formulations causing them to be less soluble and therefore less effective. Hard water can lead to poor mixing of the chemical with water and affect the balance of the surfactant system. It also affects properties such as wetting, emulsification and dispersion, especially with emulsifiable concentrates.

water solubility

A property of a pesticide that is its saturation concentration in pure water at a given temperature. It is generally expressed in grams per litre (g/L) or milligrams per litre (mg/L).

water-dispersible granules or tablets

A formulation consisting of granules or tablets to be applied after disintegration and dispersion in water.

water-dispersible powder
water-dispersible powder for slurry seed treatment

A powder to be dispersed in water before application as a slurry to the seed.

The APVMA formulation type code for water-dispersible powder for slurry seed treatment is WS.

water-dispersible slurry

A two-phase concentrate that contains solid pesticide suspended in a liquid that is capable of suspension in water.

water-dispersible slurry seed treatment
water-dispersible tablet

A formulation in the form of tablets to be used individually, to form a dispersion of the active constituent after disintegration in water.

The APVMA formulation type code for a water-dispersible tablet is WT.

water-soluble bag

A primary pack that consists of a sealed water-soluble bag that retains the contents under dry conditions. The water-soluble bag may provide a reduced operator exposure to the content and provide the convenience of a specific dose. The bag should dissolve or disintegrate when placed directly into a specific amount of water to release all its content.

water-soluble gel

A gelatinised formulation to be applied as an aqueous solution.

The APVMA formulation type code for water-soluble gel is GW.

water-soluble granule

A powder formulation to be applied as a true solution of the active constituent after dissolution in water, but which may contain insoluble inert ingredients.

The APVMA formulation type code for water-soluble granule is SG.

water-soluble granules or tablets

A formulation consisting of granules or tablets to be applied as a true solution of the active constituent after dissolution in water, but which may contain insoluble inert ingredients (excipients).

water-soluble powder

A formulation consisting of granules to be applied as a true solution of the active constituent after dissolution in water, but which may contain insoluble inert ingredients.

The APVMA formulation type code for water-soluble powder is SP.

water-soluble powder for seed treatment

A powder to be dissolved in water before application to the seed.

The APVMA formulation type code for water-soluble powder is SS.

web content management system (WCMS)

An application that can be readily used by multiple authors to create, maintain, manage and publish content on web pages.

weed

A plant that is growing in a situation where it is not wanted or where it interferes with a desirable plant.

Weeds generally interfere with activities of humans or their welfare. Weeds can include wild species, garden escapes and volunteer crop plants. Plants may be desirable plants in one situation (eg in a planted crop), but weeds in another situation (eg growing as volunteer plants in a planted crop of another species).

weed control

The process of limiting weed infestations or killing weeds for aesthetic, economic, public health or other reasons.

weed eradication

The elimination of all live plant parts and seeds of a weed from a site.

weed suppression

To retard or inhibit weed growth.

weedicide
weedkiller
wet weight

Samples are analysed fresh, with no allowance made for moisture content.

wettable
wettable granule
wettable or water-dispersible granule

A formulation consisting of granules to be applied after disintegration and dispersion in water.

The APVMA formulation type code for a wettable or water-dispersible granule is WG.

wettable powder
wetter
wetting agent

A chemical or mixture of chemicals added to some pesticide sprays to improve wetting, and thereby causing the spray to spread and wet the leaf surfaces more readily. Wetting agents work by reducing the surface tension and contact angle of a liquid, thereby increasing the spread of a liquid on a surface.

WHO

World Health Organization of the United Nations. Headquarters are in Geneva, Switzerland.

WHP
wildling

A wild plant, flower or animal. Term often used in forestry to describe trees not deliberately planted in cultivated forest.

wilted

The condition of plants that have lost excessive amounts of water by transpiration through the leaves. Such plants droop and their leaves and stems become flabby.

windrowing

Pushing plant material into a long narrow heap to accelerate drying (desiccation) of the leaf material and/or of the seed head.

windshear

The rate of change of the vector wind with distance in a specified direction normal to the wind direction. Shear is an important property of the wind field (ie shear at a well-marked frontal surface may produce shearing instability).

winter annual

A plant that germinates in the autumn, lives over winter, produces its seed during the following spring and then dies.

withdrawal period

Similar to a withholding period, but applied to medicated feed or water—the interval in days during which medicated feed or water should be withdrawn from livestock prior to slaughter or the collection of milk or eggs for human consumption.

withholding period

From s. 3 of the Agvet Code:

In relation to the use of a chemical product, means the minimum period that needs to elapse between:

(a) the last use of the product in relation to a crop, pasture or animal, and

(b) the harvesting or cutting of, or the grazing of animals on, the crop or pasture, the shearing or slaughtering of the animal, or the collection of milk or eggs from the animal for human consumption, as the case may be

in order to ensure that the product’s residues fall to or below the maximum limit that the APVMA permits.

The minimum period that must elapse between the last use of an agricultural or veterinary chemical product in relation to a crop, pasture or animal and the harvesting or cutting of, or the grazing of animals on, the crop or pasture, the shearing or slaughter of the animal, or the collection of milk or eggs from the animal for human consumption, as the case may be, in order to ensure that the product’s residues fall to or below the Australian maximum residue limit. The required withholding period(s) will be included as a label instruction on an approved label.

within-run precision

The precision for an analytical test or procure with a single run in a single laboratory.

without appreciable risk

The practical certainty that injury will not result even after a lifetime of exposure.

woody plants

Plants that develop wood as structural tissue. This type of plant is generally perennial and includes trees and shrubs.

wool scourability
work instructions (WIs)

Internal APVMA documents that contain instructions and set out the process, standards or criteria to be adhered to in delivering a service.

working day

From s. 3 of the Agvet Code:

A day other than a Saturday, a Sunday or a day that is a public holiday in the place where the office of the APVMA is situated.

working documents

In terms of manufacturing, the documents associated with each batch of product manufactured, eg batch manufacturing formulae, manufacturing (or processing) and packaging instructions. These documents are based on, and may be authorised photocopies of, master documents.

Working seed

An organism at passage level between master seed and production seed.

working seed lot (WSL)

A homogeneous suspension of cells or organisms derived from the master seed lot (MSL) under defined conditions and aliquoted into individual containers for storage. The WSL is used at a defined passage level for routine production. Containers for MSL and WSL, once removed from storage, must not be returned to the seed lot stock.

A culture of microorganism derived from the master seed lot and intended for use in the production. Working seed lots are distributed into containers and stored.

Wormers
wound dressing

Treatments applied directly to wounds or fly-strike-affected areas on individual sheep.