Category Archives: grains

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 »

Monitoring for establishment pests prior to sowing.

Melina Miles   October 6, 2015   Comments Off on Monitoring for establishment pests prior to sowing.

Where there is a history of soil insect damage resulting in poor crop establishment a pre-sowing inspection of the affected fields is warranted to determine the likely risk to the upcoming summer crop. Grain baits are an effective way of monitoring for soil-dwelling insect pests of summer crops, and is preferable to sampling with a shovel, which is both time… Read more »

Helicoverpa activity and other pests to watch for in winter crops.

Melina Miles   September 10, 2015   Comments Off on Helicoverpa activity and other pests to watch for in winter crops.

Helicoverpa armigera active now. This spring a number of agronomists have just started monitoring pheromone traps across the northern region, and the results from the past two weeks illustrate how useful pheromone traps can be. Over the past 1-2 weeks, the traps are catching relatively high numbers of Helicoverpa armigera, and low catches of H. punctigera. In September it is generally assumed that… Read more »

Locusts and grasshoppers active across western regions and central Queensland

Melina Miles   February 3, 2015   Comments Off on Locusts and grasshoppers active across western regions and central Queensland
Spur-throated locust nymph (QDAFF)

Locusts and grasshoppers are active across large areas of western Queensland and NSW and central Queensland. Reports of the Australian Plague Locust, Migratory Locusts,  Yellow winged locust and spur-throated locust have been received from areas around St George to the Central Highlands during January and early February. It has been several years since we have seen such high locust and grasshopper… Read more »

Soybean moth active in North Queensland

Hugh Brier   February 2, 2015   Comments Off on Soybean moth active in North Queensland
Soybean moth larvae and typical leaf mining damage

Significant soybean moth activity has recently been reported in some Burdekin soybean crops. Soybean moth is a generally a minor soybean pest but significant outbreaks have been reported periodically in all soybean growing regions. Feeding damage Larvae feed mostly within the leaves, making distinctive pale leaf mines, and often distorting leaves. Soybean moth is present in low numbers in most… Read more »

Lucerne crown borer on the move in soybean in 2015

Hugh Brier   January 30, 2015   Comments Off on Lucerne crown borer on the move in soybean in 2015
Lucerne crown borer in early planted soybean at Bundaberg.
Image by Simon Andreolli

Lucerne crown borer (Zygrita diva) (LCB) is causing severe damage in a number of soybean crops in the Bundaberg region of SE Qld, and on the North Coast region of NSW. In some cases up to 75% of plants are infested and early plant death is evident. Damage seems to be worse in the early (November-planted) crops which were sown… Read more »

Leaf mining fly (Agromyzid) infestations in wheat in NW NSW and southern Qld

Hugh Brier   October 11, 2014   Comments Off on Leaf mining fly (Agromyzid) infestations in wheat in NW NSW and southern Qld

Leaf mining caused by Agromyzid flies has recently been reported in wheat crops in the Goondiwindi/ Toobeah (late August) and Quirindi (late September) regions. Consultants reported their initial impression was that the damage symptoms, pale stripes on the leaves, resembled old stripe rust infections. However on closer inspection, the leaves were actually a windowed with frass visible inside the translucent… Read more »

Armyworms defoliating sorghum, millet and corn on the Downs

On the Darling Downs there have been a number of reports of common armyworm causing significant defoliation in sorghum, corn and millet. Jimbour grower John Alexander treated a severely defoliated sorghum crop two weeks ago. Millet and corn crops in the same area have also been affected. Although patchy, the outbreaks have the potential to cause significant yield loss if… Read more »

Spring pests of winter cereals

Melina Miles   August 30, 2013   Comments Off on Spring pests of winter cereals

Armyworm in barley and wheat. A number of reports of armyworm in crops have been received over the past couple of weeks. Numbers range from 30 to 50 per square metre (extreme) to a more typical 5 to10 larvae per square metre. Assessing larval density is done using a sweep net, bucket or beating a section of row into a… Read more »