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Silverleaf whitefly update
There are reports of large infestations of silverleaf whitefly (SLW) from the Narrabri/Moree region. Exponential growth in whitefly numbers coupled with honeydew on leaves indicates that the whitefly are probably SLW and not East Australian native Bemisia or Greenhouse whitefly (GHW).
It is thought that increased host plant availability from a wet winter/spring, warm conditions and [...]
Posted in Cotton, Silverleaf whitefly 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 [...]
Silverleaf whitefly in cotton – an update
Silverleaf whitefly (SLW) is a serious pest of cotton. It reduces yield and quality of cotton due to feeding damage and excretion of honey dew. It is a difficult pest to manage due to its ability to rapidly increase in numbers and the development of resistance to many insecticides.
Resistance testing for the 2007-08 season indicated [...]
Posted in Cotton, Silverleaf whitefly, whitefly Leave a comment
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 [...]
Insurance spray for mirids in Bollgard II
With the Festive Season almost here and an irrigation pending, is there value in applying a spray for mirids for peace of mind? This decision to apply an insurance spray needs to be carefully considered because it has the potential to cost much more in the long run.
Where do mirids come from?
Mirids overwinter as [...]
Posted in Cotton, mirids Leave a comment
Thresholds and changing sorghum crop value
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 [...]
Bring on NPV against grubs on grain sorghum
Every year caterpillars of the corn earworm (helicoverpa), Helicoverpa armigera, cause losses to sorghum crops. Regular inspection during flowering is important to detect caterpillar infestations and properly time control measures.
Pre-flowering heads of grain sorghum are very attractive to egg-laying moths of the corn earworm. On any individual head, most eggs are laid prior to [...]
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 [...]
Armyworm in wheat
Over the past couple of weeks there have been numerous reports of armyworm in both barley and wheat. The appearance of armyworm in wheat raises a number of questions:
1) Do they behave the same way in wheat as in barley in relation to the type of damage they cause
2) what is their damage potential and [...]
Posted in Winter cereals, armyworm Leave a comment
Soybean Moth causing major damage in soybeans