Daily activity patterns were obtained for the mirids Creontiades dilutus and Carnpylornrna liebknechti sampled from flowering cotton in the Lockyer Valley of southeastern Queensland. Two activity peaks occurred for both species, one during mid-morning and a second in the late-afternoon, the latter being the time of greatest activity. The commercial implications of this pattern are discussed.The green mirid Creontiades dilutus (Stal) and the apple dimpling bug Campylomrna liebknechti (Girault) are important secondary pests of Australian cotton (Bishop 1980; Malipatil 1992). Adults and nymphs can attack the plant throughout its growth, causing reduced yield, and delaying crop maturity (Adams et al. 1984). The adults of both species are active flyers, making detection difficult and the need for accurate sampling methods crucial. Sampling of commercial cotton crops is carried out every 3-4 d, and consists of visual checks of a number of cotton plants to gain an estimate of insect numbers (Shaw 1990).
The first indication of resistance to organophosphorus insecticides in red scale, Aonidiella auranlii, from Australia is noted from the Mundubbera region, Queensland. Samples of scale-infested fruit were dipped in a commercial formulation of methidathion and the mortality of sessile first instars was recorded. Analy+\ of variance revealed that two populations contained significant numbers of first instars surviving the insecticide treatment. Presence of resistance to methidathion in red scale populations would limit its usefulness in pest management programs and may indicate cross-resistance to other organophosphates.
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