Tag Archives: resistance

Whitefly resistance monitoring in Cotton

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Results for 2011-12 Monitoring for resistance in Silverleaf whitefly, collected in the 2011-12 cotton season, is now complete. Results show that resistance exists for Admiral® and bifenthrin (e.g. Talstar®) in horticulture but not in cotton while SLW remain susceptible to Pegasus® and Movento® In total 17 collections were made from Emerald, St George, Theodore, Moree and Narrabri for resistance monitoring…. Read more »

Annual Helicoverpa resistance testing results for 2011-12

Implications for management in grains and pulses The insecticide resistance monitoring program for Helicoverpa aims to measure resistance frequencies of field populations collected from Central Queensland through to the Riverina area of NSW. Field collections of Helicoverpa eggs are reared in the laboratory and larvae are tested with doses of insecticide that are known to kill susceptible insects. Survivors are… Read more »

Collecting to assess silverleaf whitefly susceptibility to insecticides

As the cotton season draws to a close it is time to for the DAFF team working on Silverleaf whitefly (SLW) resistance monitoring to start making collections of whitefly from across the cotton-growing regions. Even if SLW numbers are below threshold, it is possible for the team to make collections of either nymphs (on leaves) or adults (using the suction… Read more »

2010-11 Annual Silverleaf Whitefly Resistance Testing Results and Implications for Management in the coming Season.

Last season was a somewhat low pressure year for silverleaf whitefly (SLW) in all cotton districts. The low pressure may have been attributed in part to high rainfall especially through central Queensland which does not favour whitefly population build up. St George and Mungindi districts still reached densities that exceeded the recommended insecticide spray thresholds although they generally fitted into… Read more »