Completed project
Review of issues and options for preventing and removing redback spiders in broccoli (VG17014)
Publication date: December 17, 2018
Delivery Partner: Applied Horticultural Research
With an increase in redback spider numbers being reported in broccoli, this short 2018 investment reviewed all available information on the problem. It examined factors that may be contributing to the spiders entering broccoli crops, or contaminating broccoli after harvest, and produced the below key findings to help explain the situation:
The researchers noted that peaks of redbacks being found in broccoli appeared to correspond with hot, dry summer conditions. “The risk appears to be increased when an autumn crop of broccoli follows a summer crop of cucurbits, such as pumpkin,” they noted. “It is unclear whether this is because significant redback populations remain in the field, or whether redbacks sheltering on equipment and harvest bins enter broccoli after harvest. However, it is noted that the major outbreak of redback spiders in broccoli [in south east Queensland] occurred after a dry summer when pumpkins were in major oversupply, resulting in abandoned crops and extended storage of harvested produce.”
In regard to reducing the risk of redback infestation, the project team recommended thoroughly cleaning equipment and machinery used to grow and harvest broccoli and, if spiders are found in the field, destroying crop residues that they could use as harborages.
The project produced a handbook for growers to better understand the risk and management of redback spiders in broccoli. Download it here.
This project was a strategic levy investment in the Hort Innovation Vegetable Fund
© 2026 Horticulture Innovation Australia Limited.
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