Evaluating long term control of Amnemus superciliaris (Pascoe) with pre-sowing insecticidal treatments in desmodium pastures

Abstract

Dieldrin and heptachlor pre-sowing soil treatments were evaluated for long term contro] of Amnemus superciliaris (Pascoe) in Desmodium spp. in a trial in south-eastern Queensland during 1969-1975. Treatments significantly reduced infestations of the weevil and root damage for 3 to 6 years. However, injury by the weevil in untreated areas did not produce a serious enough decline in legume density to justify treatment. The maintenance of favourable growing conditions enabled the pasture to compensate for loss of damaged plants.