Prepare for the 2026 season now

A ladybird on the stem of a bent white flower. Overlaid text reads: SARDI PestFacts.

As 2025 wraps up, now's a critical time to tidy paddocks and prepare for the 2026 cropping year.

Summer weeds and volunteer plants aren’t just competitors for moisture and nutrients; they serve as hosts and refuges for pests that threaten the next crop. A strategic summer clean-up will pay dividends next season.


Why summer weeds matter

  • Summer weeds compete for moisture and key nutrients, reducing what’s available for crop establishment.
  • Weeds host pests and act as a green bridge into the next season.
  • Early control of weeds (when small and actively growing) improves herbicide efficacy and lowers resistance risk.

Pest risk starts now

  • Summer broadleaf weeds, like marshmallow or regrowth canola, allow aphids (green peach aphid) and viruses (TuYV) to persist over summer, increasing early-season pressure.
  • Mites, like the redlegged earth mite (RLEM), benefit from summer weeds that retain moisture and shelter, increasing autumn-hatch and feeding-risk at sowing.
  • The green refuge of summer weeds and volunteer plants supports pest snails that damage seedlings and contaminate harvests.
  • Soil-dwelling pests favour paddocks with high summer weed-loads or volunteer crops.

Weed and pest management over summer

You should:

  • inspect paddocks now: identify high weed-load, volunteer crops, or past pest histories
  • prioritise action: focus on paddocks with greatest risk (high weeds with a history of pests)
  • monitor pests: use pitfall traps and visual checks for early pest presence
  • clean it up: aim for a weed-free window 3 to 4 weeks ahead of sowing to break pest-host links
  • use optical spot-spraying technologies: to help significantly reduce herbicide use in summer fallows, while maintaining effective weed control.

More information


Report to PestFacts

Maryam Ehsangar 
Phone: 0448 010 339
Email: maryam.ehsangar@sa.gov.au

Maarten van Helden – Maarten van Helden
Phone: (08) 8249 0642
Email: maarten.vanhelden@sa.gov.au

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