Australian Mungbean Association

Australian-grown mungbeans have quality written all over them!

Mungbean Entomology – research update

Phytoplasma update.

 

4 March, 2019

 

Mungbean entomology update

by Trevor Volp & Hugh Brier, DAF

 

Helicoverpa resistance management

  • Resistance on the rise for Steward® (industry-wide
  • average: 6.2% cf. 1.6% in 2013-14) & Altacor® (industrywide
  • average: 0.9%, Darling Downs: 2.6% cf. 0% in 2013-14)
  • Selective insecticides available and registered: Altacor®, Steward®, and Affirm®
  • Altacor® & Steward® windowed around major mungbean and chickpea spray periods
  • Field trials show Altacor® ~85% residual control up to 3 weeks, Affirm® has ~70% after 2 weeks (Chickpea data)
  • ‘GRDC Helicoverpa resistance management strategy’ for more details

 

Phytoplasma update

  • Very low levels observed in 2018/19 monitoring on the Darling Downs (<1% incidence in mungbean crops)
  • Ongoing QDAF work to identify leafhopper vector, triggers for outbreaks, and what % of hoppers carry the bacteria
  • Current management recommendation is to control weeds that act as a host for leafhoppers and the disease

 

Starkle® registered in mungbeans for mirid control

  • Rate: 90g/ha
  • Hard on predatory beetles, bugs, parasitoid wasps, and bees (cotton management guide & DAF trial data).
  • High risk of flaring Helicoverpa
  • Not a softer option than 250mL dimethoate + 0.5% NaCl (the current softest most effective mirid option)
  • Low rate dimethoate option developed in the last Helicoverpa resistance crisis (in pre-Steward days).
  • Starkle® is roughly $12/ha more expensive than half-rate dimethoate

 

Be alert for mites in hot weather

  • Hot summers with low rainfall favour two spotted mites
  • Additional risk factors are the use of non-selective insecticides against other pests, and proximity to earlier maturing mite hosts such as maize.
  • To minimise the risk of mites, avoid prophylactic sprays and select the softest insecticide options where these are available.

 

Contact details

Trevor Volp, DAF

trevor.volp@daf.qld.gov.au     0429 641 912

Hugh Brier, DAF

hugh.brier@daf.qld.gov.au      0428 188 069

 

Acknowledgements

Funding from GRDC and DAF

 

More information:

www.mungbean.org.au