Australian Mungbean Association
Australian-grown mungbeans have quality written all over them!
Altacor softer on beneficials
20 July, 2017
DuPont has gained registration for the insecticide Altacor to control Lepidoptera species in chickpea, mungbean and soybean. The insect pests covered by the registration include helicoverpa, bean podborer, soybean looper, beanlooper and irrorated tabby larvae.
The restrictions placed on the use of Altacor include applying a maximum of two sprays per season and not harvesting the pulse crop for 14 days after application.
Westward incursions of bean podborer larvae in mungbean crops and sustained pressure during wet conditions in recent summers saw rolling infestations of bean podborer in several mungbean crops in some regions. In the Fassifern Valley one flood-plain crop suffered near total yield loss when it was not possible to monitor the crop or implement any control measures.
Whilst access and control was possible in most crops, sustained podborer pressure has previously require the application of up to three sprays.
“Obviously this is costly for growers and has a negative impact on beneficial insects,” DAFF senior entomologist Hugh Brier said. “Altacor is very effective in mungbean against bean podporer and other caterpillars including helicoverpa, and gives good residual control. Generally, a single application for bean podborer control will suffice.”
Altacor is also ‘soft’ on beneficials, which will benefit the overall integrated pest management (IPM) and resistance management programs on farms.
“We are currently collecting trial data to determine new economic thresholds for these pests when they occur in the vegetative and budding stages,” he said. “For bean podborer we have set provisional thresholds of 5–7 larvae per m in flowering mungbean.”
DAFF’s entomology team is conducting field and laboratory trials to develop appropriate management strategies for these pests. Mr Brier said these trials are an important component of the GRDC-funded Northern Grains IPM project and underpin the Minor Use Permits that have been issued.
“To help validate the provisional thresholds quickly we are encouraging growers who are applying Altacor to leave small, untreated strips and to compare the differences between the treated and untreated areas,” he said. “The data required includes the number of pods set per plant, height of the pods above the ground, uniformity of pod ripening and also yield.”