Definition of terms

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Name Description Related terms
ultra-low volume (ULV)

A spraying technique that utilises equipment delivering volumes below 3 litres per hectare (L/ha), with a droplet size below 150 micrometre (µm).

ultra-low-volume liquid

A homogeneous liquid ready for use through ultra-low-volume (ULV) equipment.

The APVMA formulation type code for an ultra-low-volume liquid is UL or ULV.

ultra-low-volume suspension

A suspension ready for use through ULV equipment.


The lack of knowledge about the correct value (eg a specific exposure measure or estimate).

uncertainty factor

A reductive factor by which an observed or estimated no-observed adverse-effect level or other reference point, such as the benchmark dose or benchmark dose lower confidence limit, is divided to arrive at a reference dose or standard that is considered safe or without appreciable risk.


That portion of a powdered, solid material made up of particles or agglomerates smaller than a specified size.

understatement penalty

From s. 3 of the Agricultural and Veterinary Chemical Products (Collection of Levy) Act 1994:

Means the understatement penalty payable under s. 14A of the Agricultural and Veterinary Chemical Products (Collection of Levy) Act 1994 .

unidentified impurity

An impurity that is defined solely by qualitative analytical properties (eg chromatographic retention time).

unintentional effect

An unexpected effect brought about by the approved use of a pesticide, such as the upsurge of insects to pest numbers as a result of the unintentional destruction of their natural enemies when spraying for the control of some other pest species.

unique identifying number (UIN)

In relation to manufacturing, a number allocated by the manufacturer to each separate material received onto the premises. Multiple materials within the one delivery, but bearing different manufacturers' batch or lot numbers, should each be regarded as separate materials. In some instances, allocation of the raw material manufacturer's batch number may be acceptable as a substitute for the unique identifying number.

United States pharmacopeia

From r. 3 of the Agvet Code Regulations (unless the contrary intention appears):

Means the book of that name published by the United States Pharmacopeia Convention.


From s. 3 of the Agvet Code:

In relation to an active constituent for a proposed or existing chemical product, or in relation to a chemical product, includes deal with the constituent or product.

Use pattern

The combination of all factors involved in the use of a formulated agricultural or veterinary chemical product. These include:

  • the host crop or animal species to which the product will be applied
  • the concentration of any active constituent in the preparation being applied
  • the rate of application
  • the method of application
  • the time, frequency and duration of treatments
  • adjuvants recommended to be added
  • other directions that may appear on the label attached to the container for the chemical product that determine the total quantity applied, timing of treatment and the withholding period(s).


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