Category Archives: cotton

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 »

New insecticides for the control of silverleaf whitefly (SLW) in cotton, and considerations for resistance management

Jamie Hopkinson   January 8, 2016   Comments Off on New insecticides for the control of silverleaf whitefly (SLW) in cotton, and considerations for resistance management

Two new insecticides have recently been registered to control Bemisia tabaci B-biotype in cotton. Product Insecticide group Active ingredient Pest Exirel® anthranilic diamide (Group 28) cyantraniliprole SLW, Helicoverpa, cotton aphid (suppression only) Starkle® neonicotinoid (Group 4A) dinotefuran SLW & green mirid Exirel® was registered for cotton use in the 2013/14 season, and Starkle® has been registered for the current cotton… 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 »

Watch for Rutherglen bugs moving from canola into neighbouring crops.

Melina Miles   November 10, 2014   Comments Off on Watch for Rutherglen bugs moving from canola into neighbouring crops.
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Rutherglen bug (RGB) numbers in canola stubble are again high in some fields. These infestations pose a risk to neighbouring crops, either through damage to establishing summer crops or contamination of unharvested winter crops. Both the canola and adjacent crops warrant monitoring for RGB infestation and movement out of the canola field. If large number of nymphs move into adjacent fields with seedling… Read more »

Downs update – Symphyla and other soil pests

Paul Grundy   December 13, 2013   Comments Off on Downs update – Symphyla and other soil pests

Following the recent detection of symphyla in some cotton fields on the Darling Downs, DAFF Entomology have been testing sampling strategies for this potential pest of cotton. Literature for a similar symphyla species in North America suggested that baiting with potatoes may be an effective strategy for assessing symphyla abundance and whether individuals were actively feeding or in a restive… Read more »

Symphylans recently detected causing establishment problems in cotton on the Darling Downs

Paul Grundy   November 15, 2013   Comments Off on Symphylans recently detected causing establishment problems in cotton on the Darling Downs

An investigation into poor establishment in a field of cotton west of Dalby this week confirmed the presence of the soil dwelling symphyla as the likely cause. Symphylans are relatively common in most soils where they generally feed on decomposing organic matter. Symphyla as crop pests Symphyla have caused problems with crop establishment for a number of seasons in the… Read more »

Rutherglen bug in canola stubble – potential to damage establishing summer crops.

Melina Miles   November 12, 2013   Comments Off on Rutherglen bug in canola stubble – potential to damage establishing summer crops.

Rutherglen bug (RGB) are best known for the damage they can cause in sunflower and sorghum during grainfill, but they can also damage and even kill seedlings when present in large numbers. In 2012 RGB damaged establishing spring crops in areas of southern and northern NSW. This spring, in some crops there are large numbers of RGB in the canola… Read more »