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Canola aphid populations have continued to increase over the past few weeks in many regions. Senior farm consultant, Tim Condon (Delta Agribusiness), has reported minor problems in late-sown canola crops near Harden, in the South West Slopes district of New South Wales. Cabbage aphids (Brevicoryne brassicae) have been found on >50% of flowering spikes. Insecticides have been applied to some paddocks, and pirimicarb has been reported to be very effective. Grower, Richard Russell (Head & co), has also observed aphids in several canola crops northeast of Shepparton, in the Northern Country district of Victoria. The aphids are mostly on the edges of paddocks, and chemical control has not been undertaken due to the late stage of canola plants.
Cabbage aphids and turnip aphids (Lipaphis erysimi) are the two most common aphids found on canola in spring. For further information about these pests, refer to PestFacts Issue No. 9.
Given the late stage of canola crops, it is unlikely that applying chemical sprays will be economically viable in most situations. However, this may not hold true for late-sown crops that are still many weeks away from harvest. If unsure, regularly monitor crops as numbers can increase dramatically under optimum conditions.
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.
We need your reports
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.
PestFacts map
PestFacts map is an interactive tool that allows users to search and view historical pest reports across Victoria and NSW. The map is updated with each issue of PestFacts to include new reports.
How to acknowledge PestFacts?
With appropriate acknowledgement, cesar grants permission to reproduce information taken directly from PestFacts. To cite PestFacts: “PestFacts south-eastern (<<enter date published>>). cesar pty ltd.”
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