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Category Archives: helicoverpa
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 [...]
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 [...]
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 [...]
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Control considerations for Helicoverpa in chickpea
The recently released brochure outlining how to calculate an economic threshold for helicoverpa in chickpea is available on the DPI & F website at www.dpi.qld.gov.au/fieldcrops. Click on the link to Helicoverpa management in chickpea where you can view or download the brochure. Control considerations – which product when? There is a range of products registered [...]
Also posted in Chickpeas Leave a comment
Are corn earworm a problem in winter cereals?
Corn earworm, Helicoverpa armigera, are frequently found in winter cereals but usually numbers are too low to warrant control. Occasionally, however, corn earworm numbers may be sufficient to cause economic damage. The high value of today’s grain is further reason to carefully check for grub infestations. It is not unusual to find both corn earworm [...]
Also posted in Winter cereals 5 Comments
A better way to make decisions about Helicoverpa control in chickpea
A new guide to calculating economic thresholds available now Growers and agronomists are now able to calculate how much yield they will lose if they do not control an infestation of helicoverpa in chickpea. They can calculate the point at which it is economic to control an infestation based on the potential yield loss, their [...]
Also posted in Chickpeas Leave a comment
Accessing the Diapause Tool – An alternative address