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A means by which a selected natural mechanism (eg, parasitism, predation, disease) is used to control pests. Has the advantage of minimising the legal, health and environmental hazards associated with chemical control.
Froth, resembling spit, produced by the larvae of froghopper insects, to provide them with thermal and moisture control, and to hide them from predators. The larvae suck sap from the plant, but generally do little harm.