Category Archives: silverleaf whitefly

Whitefly in establishing grain crops

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 »

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 »

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 »

Whitefly in establishing canola crops – Central NSW

Melina Miles   May 28, 2014   Comments Off on Whitefly in establishing canola crops – Central NSW

Over the past couple of weeks there have been reports of whitefly adults infesting canola in the Central West and Lachlan regions of NSW. This is not an occurrence that has been recorded before, so we don’t know conclusively what the outcome will be of these infestations. What I have done is pulled together information on whitefly that will help… Read more »

Whitefly resistance monitoring in Cotton

adminmelina   September 10, 2012   Comments Off on Whitefly resistance monitoring in Cotton

Results for 2011-12 Monitoring for resistance in Silverleaf whitefly, collected in the 2011-12 cotton season, is now complete. Results show that resistance exists for Admiral® and bifenthrin (e.g. Talstar®) in horticulture but not in cotton while SLW remain susceptible to Pegasus® and Movento® In total 17 collections were made from Emerald, St George, Theodore, Moree and Narrabri for resistance monitoring…. Read more »

Collecting to assess silverleaf whitefly susceptibility to insecticides

Melina Miles   March 1, 2012   Comments Off on Collecting to assess silverleaf whitefly susceptibility to insecticides

As the cotton season draws to a close it is time to for the DAFF team working on Silverleaf whitefly (SLW) resistance monitoring to start making collections of whitefly from across the cotton-growing regions. Even if SLW numbers are below threshold, it is possible for the team to make collections of either nymphs (on leaves) or adults (using the suction… Read more »

Managing Silverleaf Whitefly (SLW) – Wet conditions, late crops and immigrant populations

adminmelina   March 1, 2012   Comments Off on Managing Silverleaf Whitefly (SLW) – Wet conditions, late crops and immigrant populations

Management of whitefly this season will be challenging as a result of the high rainfall and flooding in November and  again in February which has resulted in a wide spread of crop maturity both between and within each region. While some cotton crops will mature on time, others could be set back by as much as six weeks by the cool… Read more »

2010-11 Annual Silverleaf Whitefly Resistance Testing Results and Implications for Management in the coming Season.

adminmelina   November 14, 2011   Comments Off on 2010-11 Annual Silverleaf Whitefly Resistance Testing Results and Implications for Management in the coming Season.

Last season was a somewhat low pressure year for silverleaf whitefly (SLW) in all cotton districts. The low pressure may have been attributed in part to high rainfall especially through central Queensland which does not favour whitefly population build up. St George and Mungindi districts still reached densities that exceeded the recommended insecticide spray thresholds although they generally fitted into… Read more »

How to check for parasitism in whitefly populations.

adminmelina   February 22, 2010   Comments Off on How to check for parasitism in whitefly populations.

We have fielded numerous enquiries this week from consultants who would like to assess levels of whitefly parasitism. This is achievable in the field with the use of a hand lens. Parasitism levels appear to be a little down from last year, but still good levels have been recovered. Parasitism so far has ranged from 50-90% in Emerald, 35% in… Read more »