Phytoplasma in mungbeans—Update: early March 2018

Phytoplama has been reported in second flower flushes in mungbeans, and also in harvested mungbean regrowth! So far the overall incidence of phytoplasma has been lower than this time last year, but growers and consultants are urged to keep monitoring their crops for the first symptoms of this disease, and to report any outbreaks. Many January-planted mungbean crops are at… Read more »

Is that larva dying, or still causing damage? Recognising the symptoms of newer insecticides on helicoverpa larvae

As more growers and agronomists look to rotate insecticides for helicoverpa control in grain crops as part of a sound resistance management strategy, uncertainty about how to tell if larvae are actually dying, or had escaped control for some reason has emerged as a concern in some instances. These cases, where larvae have not died as quickly as expected, have… Read more »

Soybean stem fly on the move in soybeans in the Northern Rivers NSW

UPDATE: Crop progress report (March 2018) Recent photos of the crop where a stem fly infestation was reported in early February show signs of stem fly pupation, but no crop stress symptoms (i.e. no yellow and dying leaves), indicating that managing the outbreak when it was first detected would have been a waste of time and money (assuming there will… Read more »

Keep a lookout for phytoplasma in mungbeans and other summer legumes

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Last summer saw unprecedented levels of phytoplasma in summer pulses/legumes (including chickpeas, mungbeans and pigeon peas) in all cropping regions in eastern and northern Australia from the Ord Irrigation area (WA), Burdekin/Atherton Tablelands (NQ), to central NSW. The most likely insect vector is the brown leafhopper Orosius orientalis, which has been detected in recent (2017) spring crops. While plantings of… Read more »

Helicoverpa pheromone trapping program concluded for 2017

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The Helicoverpa pheromone trapping program has recently concluded for the 2017 Winter/Spring season. The program, run by the Queensland Department of Agriculture and Fisheries for the Northern Grain Growing region, forms part of the national Helicoverpa monitoring network jointly run by cesar, SARDI, and DAFWA. The primary purpose of the trapping network is to detect high moth activity, for both… Read more »

Insect pest management in sorghum – a refresher

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Sorghum is most susceptible to crop loss from insect pests during flowering and grain fill, and this article deals mostly with these species (sorghum midge, helicoverpa and Rutherglen bug). However, some years there may be pest infestations in vegetative sorghum. Vegetative sorghum During the vegetative stages you may see a few armyworm or helicoverpa larvae causing shot-holes in the leaves,… Read more »

Rutherglen bug damage in mungbeans

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Although typically only in low numbers in the Northern Grains region, Rutherglen bugs (RGB; Nysius vinitor) were observed at very high densities (e.g. 50 RGB per pod) in many crops last year. A glasshouse study was conducted to determine at what plant stage mungbeans were most susceptible to RGB damage, in terms of both yield and seed quality. To do… Read more »

Do I have a wireworm – true or false?

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Wireworm adults and larvae are relatively common soil pests, attacking all field crops. Adults feed on germinating shoots, and larvae feed on germinating seed, seedling roots and shoots causing poor plant vigour or death. Wireworms are most common in zero till, areas with high stubble, or weedy fallows. These are habitats and food sources that sustain the beetles and enable… Read more »

New aphid found in faba beans

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Megoura crassicauda has been found in parts of north-east and central New South Wales (Sydney, Tamworth, and Breeza). The species originated in north-east Asia, and is closely related to the vetch aphid (Megoura viciae), found in Europe, Ethiopia and North America. Its host range is mostly limited to Vicia species – vetches, faba or broad beans, and may extend to… Read more »

Helicoverpa activity and management in chickpeas

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Helicoverpa are the primary insect pest of chickpeas. Beneficial insects that are present in many crops do not thrive in chickpeas, so successful helicoverpa management relies heavily on monitoring and identification, appropriately timing control to crop stage, and using the recommended thresholds. Monitoring involves regular in-field checking with a beat sheet. Additionally, moth numbers can be monitored using pheromone traps… Read more »