The control of prickly pear (Opuntia inermis) in Queensland by Cactoblastis cactorum has continued satisfactorily since major work on the project ceased. Recent infestations have been of relatively minor significance, although those in coastal areas are a problem. Populations of prickly pear and C. cactorum at a coastal site and three inland sites were compared to determine the cause of the persistent coastal infestations. It is suggested that dense stands of prickly pear occur where plant resistance suppresses C. cactorum population growth. The resistance is related to plant growth under conditions of water or nutrient stress.
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