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Broadacre Field Crops DAFF QLD

Registered items

New weeds could be new species not previously seen on a property, new species in specific fields from other fields or non-cultivated areas... Potential problem winter weeds include fleabane and sowthistle, which may have been seeding at the time of the floods and may be establishing now... Those species of weeds where herbicide resistance has been identified in the northern agricultural region include wild oats, sowthistle, fleabane, barnyard grass and liverseed grass...
GRDC Taxonomy:
As a green manure crop, soybeans provide good quantities of dry matter and large amounts of nitrogen... Better efficacy could be obtained by using smaller nozzles and lower water rates on small weeds... The problem with the system in the wet tropics is that decomposition is rapid and much of the available nitrogen will be lost through leaching or denitrification under waterlogged conditions...
GRDC Taxonomy:
Image showing drab colouration of the adult Tachinid fly.. Because tachinid flies do not kill the host until after the caterpillar has finished feeding, helicoverpa crop damage is not prevented... The tachinid fly Goniophthalmus australis lays microscopic eggs (measuring 0.2 mm each) onto the plant surface close to where a helicoverpa caterpillar is feeding so that the caterpillar eats the eggs and becomes a host...
GRDC Taxonomy:
" Print the page Photograph of Green vegetable bug adult and nymphs on plant - nymphs change colour as they develop, adults are uniformly bright green... Risk period: Adult bugs typically invade summer legumes at flowering, but GVB is primarily a pod feeder with a preference for pods with well-developed seeds... The GVB threshold in typical edible soybeans crops is a low 0.3 adult GVB per square metre...
GRDC Taxonomy:
" Print the page Sorghum ergot is caused by a fungus, Claviceps africana ... Sorghum grain contaminated with sclerotes can cause toxicity when fed to livestock, particularly sows, dairy cattle and beef cattle in feedlots... Experiments have shown that both broiler chickens and laying hens are relatively tolerant of sorghum ergot...
GRDC Taxonomy:
Destroy volunteer wheat plants by March, as they can provide a greenbridge for rust carryover... The spores require 15 to 20 C temperature and free moisture (dew/rain/irrigation) on the leaves to successfully infect wheat... Stem rust develops at higher temperatures than the other wheat rusts within a range of 18-30 C. Spores require free moisture (dew, rain or irrigation) and take up to six hours to infect the plant and pustules can be seen after 10-20 days of infection...
The name Helicoverpa refers to two species of moth: Helicoverpa punctigera and H. armigera , the corn earworm... The likely magnitude of these influxes of H. punctigera can be estimated by monitoring the breeding areas in inland Australia... The computer model uses current local temperatures to calculate the rate of development of pupae in the soil, and predicts the timing of emergence of moths...
GRDC Taxonomy:
The natural fertility of cropped agricultural soils is declining over time... Pasture leys, legume rotations and fertilisers all play an important role in maintaining the chemical, biological and physical fertility of soils... Nitrogen (N) Crop nutrition and application..
Image of whitegrub or peanut scarab larva and damage caused to peanut kernel.. Image of adult whitegrub or peanut scarab showing uniform brown colour.. Peanut growing regions with ferrosol soils in north-eastern Australia including the South Burnett, Atherton Tableland and the Clifton/Nobby region of the Darling Downs...
GRDC Taxonomy:

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