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Mandalotus weevils (Mandalotus sp.) have been identified causing damage to a canola crop near Young, in the South West Slopes district of New South Wales. Agronomist, David Crowley (Delta Agribusiness), says the affected area had suffered significant damage and control options were being considered. There are currently no chemicals registered for controlling Mandalotus weevils, however some growers have reported some success using high rates of bifenthrin or chlorpyrifos.
Adult Mandalotus weevils are 3-5 mm long and have a rounded, dull brown coloured body, which can easily be mistaken for a small clod of dirt. They actively feed during the night and can be extremely difficult to detect during the day. This season has seen numerous reports of Mandalotus weevils damaging canola crops across various regions of Victoria, New South Wales and South Australia. Occurrences of this pest appear to have increased in southern Australia in recent years. This may be reflective of an increased adoption of minimum tillage and stubble retention practices that create a more favourable habitat.
Click here for images of Mandalotus weevils and refer to PestFacts Issue No. 3 for more information.
What is PestFacts?
PestFacts south-eastern keeps growers and advisers informed about invertebrate pests and beneficials in broadacre crops and pastures during the winter-cropping season in Victoria and southern New South Wales.
PestFacts south-eastern is run through IPMforGrains: Best Practice Insect Pest Management, a project delivered by the National Pest Information Network (cesar, DPIRD, QDAF, NSW DPI, and SARDI). This project aims to provide grain growers and advisors with information on invertebrate grain pest occurrence and equip industry with the knowledge needed to implement integrated pest management practices. This initiative is a GRDC investment and includes in-kind contributions from all project partner organisations.
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PestFacts is produced on an ʻas-needsʼ basis and relies upon pest observations and field reports from our subscribers. If you have recently observed invertebrate pests (or beneficial species) in broadacre crops, please contact us to report your observations.
Agricultural invertebrate identification
If you are a grower or agronomist in Victoria or NSW working with broadacre crops or pastures, we can assist you with identifying invertebrates found on farms at no cost. Please contact us for identification help.
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