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Grower, Richard Russell (Head & co), has observed cabbage white butterflies (Pieris rapae) in several canola crops northeast of Shepparton, in the Northern Country district of Victoria. Cabbage white butterfly caterpillars are up to 30 mm in length and velvety green in colour with a faint yellow stripe running along the back and each side of the body. Adult butterflies have creamy white wings with one or two black spots, and a wingspan of approximately 40 mm. Their life cycle is largely dependant on environmental temperatures. Cabbage white butterflies are predominantly found in spring. They attack canola and other brassica crops by chewing large irregular holes in the leaves.
Chemical control at this time of year is unlikely to be warranted. Even when in large numbers, cabbage white butterflies will generally not affect crop yield. If spraying is needed, cabbage white butterflies can be easily controlled with a range of insecticides, including those used to control diamond back moth.
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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