Impact of insecticides on silverleaf whitefly parasitoid

The microscopic natural enemy; Eretmocerus hayati. Image: CSIRO.

The tiny wasp Eretmocerus hayati is an important natural enemy of silverleaf whitefly (SLW) and contributes to the natural biological control of this pest throughout the season. It occurs in almost all regions that grow cotton, but due to its small size (difficult to see without a hand lens) it often goes unnoticed. Like all natural enemies, Eretmocerus is susceptible… Read more »

Identifying insect pests in stored grain

Winter—time to visit your storages As temperatures drop and hopefully winter crop planting is completed, a little time invested around your storage facility will pay dividends. During our coldest months storage pests are not breeding rapidly and are less likely to fly. They are quietly sitting in grain residues in empty silos, or keeping warm in silos still holding grain…. Read more »

Whitefly in establishing grain crops

Melina Miles   May 19, 2017   Comments Off on Whitefly in establishing grain crops
SLW_fababeans17_AngusBoileau_Moree

This summer silverleaf whitefly (SLW) populations have been extremely high in many cotton crops, particularly in NSW. As these crops are defoliated, large numbers of SLW are moving out of the cotton into surrounding vegetation, including emerging grain crops. Whilst the number of SLW adults landing in seedling canola, wheat, faba beans and cereals can look dramatic, previous experience has… 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 »

Soybean moth active again in 2017 in coastal Queensland

Hugh Brier   March 6, 2017   Comments Off on Soybean moth active again in 2017 in coastal Queensland
Soybean moth larva (5 mm) and typical leaf-mining damage

Major soybean moth outbreaks have recently been reported in some coastal Burnett soybean crops, and lesser outbreaks in crops in the Burdekin. Soybean moth is generally a minor soybean pest but major outbreaks have been reported periodically in all soybean growing regions. In extreme cases, crops can be totally defoliated. Feeding damage Larvae feed mostly within the leaves, making distinctive… Read more »

Phytoplasma resurfaces in the summer of 2016/17

Hugh Brier   February 3, 2017   Comments Off on Phytoplasma resurfaces in the summer of 2016/17
Image 4. Severe phytoplasma symptoms in podding mungbeans at Byee Qld.  Note mass of small green deformed pods, plus normal undamaged pods on the same plant.  Photo by Hugh Brier

Phytoplasma (a specialised bacteria infecting plants) has been widely reported in spring-planted mungbeans from Central Queensland to North Western NSW (Moree and Narrabri) and all areas in between. Symptoms include masses of small deformed leaves, flowers and pods, plants remaining green at harvest, and possibly an increased incidence of puffy pod. While in previous recent summers, moderate to high levels… Read more »

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
Developing sorghum head showing signs of RGB damage; undeveloped seed, and spotting on developing seed.

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 »

Considerations when using pyriproxyfen on silverleaf whitefly

Jamie Hopkinson   January 10, 2017   Comments Off on Considerations when using pyriproxyfen on silverleaf whitefly

With the current season shaping up to be one of high insect pressure, we may see silverleaf whitefly (SLW), Bemisia tabaci reach problematic levels in regions outside of their traditional range. For growers and agronomists not familiar with their control it is worth investing some time to understand how one of the main registered insecticides, pyriproxyfen, works. What is pyriproxyfen?… Read more »

A new pigeon pea variety for Bollgard 3 refuges

Paul Grundy   December 22, 2016   Comments Off on A new pigeon pea variety for Bollgard 3 refuges
image of flowering pigeon pea suitable for cotton refuges

Pigeon peas represent about 80% of the refuges cultivated to offset Bollgard cotton in Australia due to the land area use efficiency of this option. However, over the years, varietal mixing and continual recycling of seed from undamaged refuges has resulted in peas that flower later in the season, increasingly lacking synchrony with Bollgard’s boll setting period, thus reducing the… Read more »

I think I may have solenopsis mealybug in my cotton – what do I do?

Paul Grundy   December 15, 2016   Comments Off on I think I may have solenopsis mealybug in my cotton – what do I do?
A solenopsis colony

Solenopsis mealybug can be found throughout Queensland’s cropping areas and has also been confirmed in Western Australia, the Northern Territory and Victoria. Whilst solenopsis has not yet been confirmed in NSW cotton crops it would be reasonable to assume that it is likely to be present in the broader landscape and it is only a matter of time before it… Read more »