Category Archives: aphids

RWA as a pest in the northern grains region

Russian wheat aphid

Russian wheat aphid (RWA) is considered a high priority pest by the grains industry because of its potential to cause significant yield losses in wheat and barley if not well managed. Triticale and rye are also susceptible to crop loss, but oats are considered relatively tolerant. It is inevitable that RWA will establish in the northern grains region, but we… Read more »

Assessing predator and parasitoid activity using sentinel prey

plantsentinelprey

Of importance to agronomists is how pest populations are changing over time and the likely impact predators will have on the pest population. Predator and parasitoid activity can be difficult to assess under field conditions, particularly the rate at which beneficials can find pest species. In this research, sentinel prey were used to gauge the level of natural predator and… Read more »

Being prepared for Russian wheat aphid in the Northern grains region

Melina Miles   March 24, 2017   Comments Off on Being prepared for Russian wheat aphid in the Northern grains region

The spread of Russian wheat aphid (RWA) (Diuraphis noxia) in the Northern grains region is considered inevitable. When it might be detected in wheat and barley is less clear as the key drivers of its spread are not well understood in Australia. Wind is likely to play a part in moving winged aphids from south to north. The most northerly… Read more »

Are there Russian wheat aphid in your wheat or barley? A short guide to checking and identifying.

Melina Miles   July 27, 2016   Comments Off on Are there Russian wheat aphid in your wheat or barley? A short guide to checking and identifying.

Key points Conditions suitable for the usual cereal aphid species will also be suitable for RWA. Aphid populations typically build rapidly in late July and August.  Do not assume aphids in cereals are just the usual oat and corn aphid. In the event of a Russian wheat aphid (RWA) infestation, early detection in spring is critical to prevent yield loss…. Read more »

Update on Russian wheat aphid outbreak in South Australia.

Melina Miles   June 9, 2016   Comments Off on Update on Russian wheat aphid outbreak in South Australia.

The National Management Group (NMG), comprising all Australian governments, Grain Producers Australia and Plant Health Australia, met on 8 June 2016 to discuss the incursion of Russian wheat aphid (Diuraphis noxia) in South Australia. Acting on advice from the Consultative Committee on Emergency Plant Pests (CCEPP), the NMG agreed that it is not technically feasible to eradicate Russian wheat aphid… Read more »

Ladybirds enjoy a cotton aphid buffet

Jamie Hopkinson   June 6, 2016   Comments Off on Ladybirds enjoy a cotton aphid buffet

The minute two-spotted ladybird beetle (Diomus notescens) and the transverse ladybird beetle (Coccinella transversalis) are two natural enemies of cotton aphid (Aphid gossypii). They are commonly found in Australian crops, however relatively little is known about their biology. A series of laboratory experiments were conducted by the Queensland Department of Agriculture and Fisheries (DAF) to learn more about aspects of… Read more »

Industry alert – Russian wheat aphids found in South Australia

Melina Miles   June 3, 2016   Comments Off on Industry alert – Russian wheat aphids found in South Australia

The South Australian government are currently responding to detections of Russian wheat aphid (Diuraphis noxia), which was initially found on a property in Tarlee in South Australia on 13 May 2106. Since the first detection, Russian wheat aphid has been found on a further 22 properties within 1,400 square kilometres, and the number is expected to rise. Investigations are underway… Read more »

Pest Alert: Russian wheat aphid (Diuraphis noxia)

Melina Miles   June 3, 2016   Comments Off on Pest Alert: Russian wheat aphid (Diuraphis noxia)

Call Biosecurity Queensland on 13 25 23 if you see this pest Russian wheat aphid (Diuraphis noxia) has been found on over 1,400 square kilometres of land in the mid-north of South Australia. Russian wheat aphid is a major pest of cereal crops which injects toxins into the plant during feeding, retarding growth and killing the plant. Russian wheat aphid… Read more »

Overview of the green peach aphid and beet western yellows virus outbreak in southern Australia (2014)

Melina Miles   January 20, 2015   Comments Off on Overview of the green peach aphid and beet western yellows virus outbreak in southern Australia (2014)
green peach aphid

In the autumn and early winter of 2014, large areas of canola in South Australia, Victoria and southern NSW were heavily infested with green peach aphid (GPA), and many of the infested crops tested positive for beet western yellows virus (BWYV). GRDC TV  has compiled a series of three videos that discuss what factors contributed to the GPA outbreak, and… Read more »

Aphids, virus and leaf feeding caterpillars in faba beans.

Melina Miles   June 11, 2014   Comments Off on Aphids, virus and leaf feeding caterpillars in faba beans.

As the warm weather persists, insect activity is remaining high. DAFFQ Entomology has received numerous reports of aphids, and leaf-feeding caterpillars. The aphids have been identified as cowpea aphid and the caterpillars as one of the summer-active armyworm species, Spodoptera exigua (lesser armyworm). The concerns about these are for the potential for crop loss caused by direct feeding damage/defoliation or virus… Read more »