Author Archives: adminmelina

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 »

Annual Helicoverpa resistance testing results for 2011-12

adminmelina   August 28, 2012   Comments Off on Annual Helicoverpa resistance testing results for 2011-12

Implications for management in grains and pulses The insecticide resistance monitoring program for Helicoverpa aims to measure resistance frequencies of field populations collected from Central Queensland through to the Riverina area of NSW. Field collections of Helicoverpa eggs are reared in the laboratory and larvae are tested with doses of insecticide that are known to kill susceptible insects. Survivors are… Read more »

NORpak Cotton Production and Management Guidelines for the Burdekin and Coastal dry tropics – New publication available now.

adminmelina   August 10, 2012   Comments Off on NORpak Cotton Production and Management Guidelines for the Burdekin and Coastal dry tropics – New publication available now.

DAFF, and partners the Cotton Catchments Communities CRC and CSIRO, launched NORpak on 10 July in the Burdekin, North Queensland. The book is focused on providing sound agronomic advice for anyone who would like to know more about growing cotton in this dynamic region. However, some of the tactics discussed provide food for thought for growers from other cotton production regions,… Read more »

Podborer pesticides under the spotlight in mungbeans

adminmelina   July 19, 2012   Comments Off on Podborer pesticides under the spotlight in mungbeans

Severe and sustained bean podborer (Maruca vitrata) outbreaks were widely reported in mungbeans over the past 2 summers.. Populations in excess of 100 larvae per square metre were observed in many crops. If left uncontrolled such populations not only impact on crop yield by reducing pod set, they also severely damage the pods that are set and delay harvest maturity…. Read more »

Soybean Loopers defoliating sunflower crops

adminmelina   March 23, 2012   Comments Off on Soybean Loopers defoliating sunflower crops

Over the past couple of weeks there have been numerous reports of sunflower crops being defoliated by caterpillars.     The caterpillar has been identified as the soybean looper, and is the same species reported on a couple of weeks ago defoliating soybeans. There are two colour forms of the soybean looper (see pictures below). Although the colour differs, they are… Read more »

Loopers out in force in soybeans

adminmelina   March 7, 2012   Comments Off on Loopers out in force in soybeans

High soybean looper (Thysanoplusia orichalcea) populations (20-40/m2) have been reported in many regions in flowering and podding soybeans. While soybeans can tolerate 33% defoliation with no yield loss during the vegetative stages, their defoliation tolerance slips to 16% during podset/early podfill. Consequently, consider taking action if high looper populations are threatening your crop. Large soybean looper (38 mm). Note the tapered… Read more »

Bean podborer harassing mungbeans

adminmelina   March 7, 2012   Comments Off on Bean podborer harassing mungbeans

Damaging bean podborer (Maruca vitrata) populations of up to 100+ larvae/m2 have been observed in flowering and podding mungbeans in the South Burnett, Dawson Callide and Central Highlands. Although podborer is not an uncommon pest in these regions during wet summers, very high populations can inflict devastating damage with zero pod set observed in some crops where the pest is… 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 »

Green vegetable bug (GVB) in late cotton

adminmelina   February 24, 2012   Comments Off on Green vegetable bug (GVB) in late cotton

There have been several reports of GVB occurring in late cotton crops. This has led to some confusion in the industry as to whether GVB needs to be controlled at this late stage in cotton.  Research done by DEEDI entomologists has shown that younger bolls are more susceptible to lint damage caused by GVB feeding. These factors need to be… Read more »

Broad mites in cotton

adminmelina   February 16, 2012   Comments Off on Broad mites in cotton

Broad mites have shown up in cotton crops in Emerald and in the Gwydir this season. Whilst the mites themselves are extremely small and difficult to see, even with a handlens, being familiar with symptoms of broad mite infestation may assist with a diagnosis.