Category Archives: sorghum

Making decisions about Rutherglen bug in maturing sorghum crops

Melina Miles   January 27, 2017   Comments Off on Making decisions about Rutherglen bug in maturing sorghum crops

Rutherglen bug (RGB) numbers are persisting in many sorghum crops as they start to reach physiological maturity. Queensland Department of Agriculture and Fisheries (DAF) research has shown no evidence of yield loss as a result of direct feeding on grain once it reaches physiological maturity (black layer). However, because most crops this year have staggered head emergence, there are a… Read more »

Thrip damage to early summer crops

Melina Miles   November 4, 2015   Comments Off on Thrip damage to early summer crops

Emerging and vegetative summer crops in close proximity to unharvested winter crop are at risk of thrip damage, but the damage is largely cosmetic and rarely warrants treating. Thrips breed up in winter cereals, and particularly after rain, will move out of the winter crops in huge numbers. Most of you will be familiar with the joys of thrips biting… Read more »

Monitoring for establishment pests prior to sowing.

Melina Miles   October 6, 2015   Comments Off on Monitoring for establishment pests prior to sowing.

Where there is a history of soil insect damage resulting in poor crop establishment a pre-sowing inspection of the affected fields is warranted to determine the likely risk to the upcoming summer crop. Grain baits are an effective way of monitoring for soil-dwelling insect pests of summer crops, and is preferable to sampling with a shovel, which is both time… Read more »

Locusts and grasshoppers active across western regions and central Queensland

Melina Miles   February 3, 2015   Comments Off on Locusts and grasshoppers active across western regions and central Queensland
Spur-throated locust nymph (QDAFF)

Locusts and grasshoppers are active across large areas of western Queensland and NSW and central Queensland. Reports of the Australian Plague Locust, Migratory Locusts,  Yellow winged locust and spur-throated locust have been received from areas around St George to the Central Highlands during January and early February. It has been several years since we have seen such high locust and grasshopper… Read more »

Armyworms defoliating sorghum, millet and corn on the Downs

On the Darling Downs there have been a number of reports of common armyworm causing significant defoliation in sorghum, corn and millet. Jimbour grower John Alexander treated a severely defoliated sorghum crop two weeks ago. Millet and corn crops in the same area have also been affected. Although patchy, the outbreaks have the potential to cause significant yield loss if… Read more »

Helicoverpa and midge management in sorghum

Melina Miles   December 20, 2012   Comments Off on Helicoverpa and midge management in sorghum

As crops come into head and start to fill grain, sorghum midge and helicoverpa will start to infest crops. Making a decision about when control is warranted is made somewhat easier with the availability of economic threshold calculators now available on the Beatsheet Blog (http://thebeatsheet.com.au/sampling-2/); or use the ready reckoners in this article. MANAGEMENT OF SORGHUM MIDGE How to count… Read more »

Management of Rutherglen bug in seedling crops, sorghum and sunflower – updated

Melina Miles   December 11, 2012   Comments Off on Management of Rutherglen bug in seedling crops, sorghum and sunflower – updated

Since early November, large numbers of Rutherglen bug (RGB) have been migrating into cropping regions from northern NSW through to Central Queensland. Whilst the exact origin of the bugs is unknown, it is likely that they are being carried on storm fronts from inland regions where they have bred up over winter and spring on native host plants that are… Read more »

Helicoverpa and NPV in Sorghum – Current Issues

adminmelina   December 8, 2011   Comments Off on Helicoverpa and NPV in Sorghum – Current Issues

As the earlier plantings of sorghum progress through flowering, moderate to high Helicoverpa pressure means that many crops have caterpillar numbers over threshold.  Nucleopolyhedrovirus (NPV) is one of the main insecticides used to control Helicoverpa larvae in sorghum, however prevailing conditions play an important role in the speed and level of control achieved with NPV.

Early Season Helicoverpa issues and the use of NPV to control larvae

adminmelina   December 6, 2010   Comments Off on Early Season Helicoverpa issues and the use of NPV to control larvae

Helicoverpa populations have started with a bang this season.  One or more larvae per plant are common in pre-flowering sorghum, corn and cotton. However, early flowering sorghum crops are carrying up to 10 larvae per head.  Corn and sorghum (monocot crops) host only Helicoverpa armigera, not H. punctigera – which has implications for control.  Some key issues relevant to dealing… Read more »

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 before control becomes economic, compared… Read more »