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Author Archives: admin
Exotic mealybug species – a major new pest in cotton
Biosecurity Queensland has confirmed an outbreak of an exotic species of mealybug currently affecting cotton properties in Emerald is also present in cotton crops in the Burdekin region.
The exotic species of mealy bug is commonly known as the Solenopsis mealybug (Phenacoccus solenopsis).
Dealing with chemical shortages for whitefly management – Zara Ludgate
We have received numerous enquiries about whitefly in the last week especially from the MacIntrye and Lower Namoi areas. Shortages of chemicals to control whitefly is currently of major concern to many growers and consultants in this region. Many enquiries also relate to species identification.
Whitefly samples identified from the MacIntyre and Lower Namoi areas have [...]
Posted in Admiral, Pegasus, Silverleaf whitefly Leave a comment
Brown stink bugs in cotton – by Moazzem Khan
Brown stink bugs have been reported in some Bollgard® II cotton crops on the Downs. As the season progresses, bug numbers may increase.
Distinguishing ‘brown’ stink bugs from each other.
Adults brown stink bugs (Dictyotus caenosus) are shield shaped, matt brown, and smaller than green vegetable bug (GVB), about 7 – 8 mm long (Plate 1). They [...]
Posted in Cotton, Stink bugs Leave a comment
Managing Helicoverpa softly in vegetative soybeans
While soybeans are more likely to be attacked by helicoverpa from flowering onwards, severe infestations can occur as early as the seedling stage. In recent years, severe early infestations have been reported on the Downs and in the coastal Burnett with the affected crops experiencing significant yield losses.
The latest published thresholds for helicoverpa in vegetative [...]
Posted in helicoverpa, soybeans 2 Comments
Chemigation for corn earworm control
Control of corn earworm, Helicoverpa armigera, in maize has generally not been practised because of the high cost associated with repeated insecticide application required during silking. In most years it is a case of forsaking the top of every cob to larval damage
However, in some years, very high pest activity results in more severe cob [...]
Posted in NPV, helicoverpa Leave a comment
Mealybugs in cotton
Outbreaks of mealybugs have recently been reported from a number of cotton farms in central Queensland. While mealybugs are considered a minor pest of cotton, they have, on rare occasions, reached minor outbreak levels or 'hotspots' in commercial crops in central Queensland
White heads and stem borer in wheat
Every year we receive reports of white heads in wheat, and while there are several possible causes of this symptom, one suspect implicated in the crime is a small stem boring larva called Ephysteris silignitis (Turner) belonging to the moth Family Gelechiidae.
Recce for armyworm in winter cereals
The quick finish for winter cereals this season has resulted in the majority of crops escaping infestations of armyworm. Headers are already into some fields, but there are reports of armyworm making their presence felt in some of the later crops.
Resistance Update on the Road
The Resistance Roadshow visited regional areas during late August and presented the latest resistance monitoring results for a suite of important pests. Presentations covered resistance to conventional insecticides in cotton aphids, mites, silverleaf whitefly and helicoverpa, and helicoverpa resistance to the Bt toxins in Bollgard II.
Posted in Cotton Leave a comment
How to check for parasitism in whitefly populations.