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Surveys show that the clover root weevil (Amnetnus quadrituberculatus) is widespread in that part of New South Wales from the Tweed to the Manning Rivers, both in natural and sown clover pastures. It occurs on a wide range of soils, and field observations suggest that white clover may be the natural host plant of the insect.
The danger of the weevil becoming a pest of clovers was not realised until attempts were made to establish subterranean clover by sod seeding into the grass-dominant pastures of the Richmond River area.
The adult weevil is a foliage feeder and causes little damage. The main injury is caused by the larvae which feed on the roots of legumes during autumn and winter.
Adults are present in the field from spring until early winter, November to March being the period of greatest activity. Eggs are laid in the central hollows of the petioles of clover plants and, on hatching, the larvae make their way into the soil to feed on the roots, preferably taproots or stout stolons. Larvae may be found in the soil from March to December, but. from August onwards advanced larvae, prepupae and pupae predominate. The adults emerge from the earthen pupal cells and commence feeding immediately. Egg-laying begins some weeks after emergence of the weevils from the soil.