There are 8 common plant protection terms you will need to know when understanding plant protection. 

Active constituent (ai)

The component in the product that actually does the job.



The active constituent enters and moves around in the plant’s sap and water system. This means it can affect pests that attack the plant while it is active within the plant.


The product works by directly contacting the pest.

Stomach poison

Affects leaf chewers and suckers that ingest plant material.


Australian Pesticides and Veterinary Medicines Authority. Controls and registers pesticides in Australia.



The product can be sold for the purpose claimed on the packaging

Withholding period

The time that must pass after application of a pesticide before crops can be harvested

Signal heading

The message above the product name that gives some indication of the toxicity of the product.

This information is from the Yates Garden Guide: fully revised & updated 44th edition, HarperCollins, $39.99. You can have this information and so much more at your fingertips by purchasing the Yates Garden Guide, available at all leading bookstores and Bunnings stores.

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