Tag Archives: thresholds

Latest helicoverpa thresholds for mungbeans

By admin | Published: January 30, 2009
Revised thresholds for helicoverpa in flowering/podding mungbeans are based on a rate of damage of 35 kg/ha per larva per square metre in podding crops. The new thresholds are nearly double the old threshold of 1/m2, and make allowances for variations in control costs and crop value. For a typical scenario with pesticide control (including [...]
Posted in helicoverpa, mungbeans | Tagged | 2 Comments

New Helicoverpa thresholds in vegetative soybeans

By admin | Published: January 15, 2009
The new economic threshold for Helicoverpa in vegetative soybeans is 8 larvae per sqare metre and replaces the old 33% defoliation threshold. The new threshold is based on field trials conducted by John Rogers (formerly with DPI&F at Kingaroy). These field trials show that approximately 7.5 larvae per square metre can be tolerated with no [...]
Posted in helicoverpa, soybeans | Tagged | 6 Comments

Thresholds and changing sorghum crop value

By admin | Published: December 16, 2008
Growers and consultants need to revise the thresholds used for important insect pests of grain sorghum such as corn earworm and sorghum midge in light of lower prices currently being offered. With new crop grain sorghum prices below $200 per tonne, the break even cost of control means that higher pest numbers (density) are needed [...]
Posted in Sorghum | Tagged | 2 Comments

Helicoverpa management in chickpea – a refresher

By admin | Published: October 8, 2008
A comprehensive overview of Helicoverpa management in chickpea can be found in the DPI&F brochure Helicoverpa management in chickpea (2007). You can read or download a copy of the brochure at the DPI & F website at www.dpi.qld.gov.au/fieldcrops. Click on the link to Helicoverpa management in chickpea where you will find the brochure. Key management decisions The [...]
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