Pasture / Winter Crops – Redlegged Earth Mite; RLEM (Halotydeus destructor)

Crop:         Pasture / Winter Crops
Insect(s): Redlegged Earth Mite; RLEM (Halotydeus destructor)

Guidelines:

  • Rotate insecticide groups.
  • DO NOT apply consecutive sprays of products from any one insecticide group
Crop stage Group* Chemical sub-group Example chemical
Seed treatment (or in-furrow) 4A
1B
2B
neonicotinoids or
organophosphates or
phenylpyrazoles
imidacloprid
dimethoate
fipronil
Bare Earth (Pre-emergent) 1B
3A
organophosphates or
synthetic pyrethroids
omethoate
bifenthrin
Early Season (Autumn when limited green growth) 1B
3A

12A

organophosphates or
synthetic pyrethroids or mitochondrial ATP synthase inhibitors
chlorpyrifos
alpha-cypermethrin

diafenthiuron (Canola only)

Spring 1B
3A
12A
organophosphates or
synthetic pyrethroids
diafenthiuron
omethoate
gamma-cyhalothrin
diafenthiuron

*Refer: CropLife Australia Expert Committee on Insecticide Resistance Mode of Action Classification for Insecticides

If both autumn and spring applications are needed, alternate between chemical groups.

Timing of Sprays

  1. Monitor Redlegged Earth Mite (RLEM) activity carefully and only treat if damage has reached threshold levels.
    1. Hatch timing tool can be used to determine season risk.
  2. One well timed spray in Autumn or Spring will maximise effectiveness of treatment.
    1. Optimal timing of Spring sprays can be calculated using the TIMERITE tool.

Placement of Sprays

  1. Apply perimeter sprays where infestations are concentrated on the edge of fields.
  2. Use blanket sprays where appropriate. However, with pyrethroid products, recent research has shown that the risk of pyrethroid resistance can be minimised through the application of foliar pyrethroids in a 50 m strip with 10 m spacing.

Cultural Practices

  1. Heavy grazing or cutting for hay or cultivation will reduce mite numbers.
  2. Control alternative hosts such as Capeweed and Paterson’s curse.
  3. Develop damage thresholds.
  4. Rotate crops and pastures that are more tolerant to the pest.
  5. Encourage predator survival by judicious use of insecticides.

For more detail on resistance management for RLEM in grain crops and pastures, refer to: http://ipmguidelinesforgrains.com.au/ipm-information/resistance-management-strategies/ and GRDC RELM BMP guide.

Notes regarding the application of insecticides:

  1. To ensure the most effective control of the pest:
  • Product labels should at all times be carefully read and adhered to;
  • Full recommended rates of registered insecticides should always be used; and
  • Ensure good coverage of the target area to maximise contact.

URL: https://croplife.org.au/resources/programs/resistance-management/pasture-winter-crops-redlegged-earth-mite-2/pasture-winter-crops-redlegged-earth-mite-2-draft/
Content last updated: June 30, 2022

CropLife Australia’s Resistance Management Strategies provide a guide for crop protection product rotation through product groups. The strategies are a useful tool that supports farmers’ adoption of resistance management. All crop protection products must be handled and applied strictly as specified on the product label or APVMA permits.

These Resistance Management Strategies do not replace product labels. They are a guide only and do not endorse particular products, groups of products or cultural methods in terms of their performance. It is important to check with the Australian regulator’s (APVMA) product database for contemporary information on products and active constituents. The database can be sourced through www.apvma.gov.au

The information given in this strategy is provided in good faith and without any liability for loss or damage suffered as a result of its application and use. Advice given in this strategy is valid as at 30 June 2022. All previous versions of this strategy are now invalid.