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Category Archives: helicoverpa
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 [...]
Also posted in NPV Leave a comment
Latest helicoverpa thresholds for mungbeans
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 [...]
New Helicoverpa thresholds in vegetative soybeans
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 [...]
Managing Helicoverpa larvae in chickpea crops close to dessication and harvest.
Over the last week or so we have received a number of enquiries about how best to manage new egg-lays, and populations of small larvae, in chickpea crops that are close to dessication and senescing.
Of most concern are crops that still have reasonable areas of green crop in them, and what the likelihood of [...]
Helicoverpa management in chickpea – a refresher
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 [...]
Accessing the Diapause Tool – An alternative address
If you are having trouble with the link to the Diapause tool provided in the story below, try the following:
http://tools.cottoncrc.org.au/xl2/diapause/index.aspx
Diapause tool to identify helicoverpa risk
While there was a hefty presence of corn earworn or cotton bollworm, Helicoverpa armigera, in the early and middle part of the 2007-08 season, pest activity has declined in recent weeks and for the most part they appear to pose no major risk.
What is diapause?
This is the time of the year when a proportion of [...]
Corn earworm chews into sorghum profits
Sorghum growers across the Darling Downs can expect to see an influx of the corn earworm, Helicoverpa armigera, in their flowering sorghum crops over the next few weeks. Growers are well equipped to deal with the problem in an environmentally friendly way.
Moths are active and wanting to lay eggs on susceptible crops, and sorghum crops [...]
Also posted in Sorghum 2 Comments
No concern for tell-tale holes
Corn earworm larvae on vegetative sorghum crops produce characteristic holes in the leaves after feeding in the throat of the plant. These tell-tale signs are of no great concern as this type of feeding will not affect crop yield.
Caption: BEB alias Austin McLennan showing a characteristic holey sorghum leaf.
The recent presence of high numbers [...]
Also posted in Sorghum Leave a comment
Managing Helicoverpa softly in vegetative soybeans