Insecticides for the control of cereal aphids

Page last updated: Monday, 11 March 2019 - 11:44am

A summary of registered insecticides for use in cereal crops for controlling the aphid vectors of barley yellow dwarf virus (BYDV) and aphid feeding damage.

Insecticides for BYDV vector control

  • Assess your own BYDV risk this season (for example, presence of green bridge) before deciding if insecticides are necessary.
  • It is vital to prevent spread of BYDV during the first 8-10 weeks after crop emergence, as this is when plants are most vulnerable to the effects of the virus. Low numbers of aphids can spread the disease in high risk areas.
  • Standard rates of insecticides are recommended for use early in the season in high risk areas to deter aphids from spreading virus when feeding on the cereal crop.
  • Where two different insecticide rates are recommended, the lower rate is sufficient in most circumstances.
Table 1 Registered insecticides for BYDV vector control
Active ingredient Product Rate per hectare Remarks
alpha-cypermethrin (100g/L) Alf, Alpha100, Alpha Cyper, Alpha-Cyp100 Duo, Alpha-cypermethrin 100, Alpha Duo, Alpha Duo 100, Alpha Duop 100, Alpha-Scud Elite, Alphasip Duo, Astound Duo,  Buzzard, Centaur 100, Dictate 100, Dominex Duo, Fastac Duo, Ken-Tac 100, Mascot Duo, Unialphacyper 100, Unichoice100 125 Apply at three and seven weeks after emergence to reduce aphid colonisation and spread of BYDV
beta-cyfluthrin (25g/L) Bulldock 250 or 500mL Use high rate in high risk areas, apply at five and nine weeks post seeding

Chlorpyrifos 300g/L and

L-cyhalothrin 15.4g/L g/L
Cobalt 200 or 300 Apply sprays four and eight weeks after emergence to reduce aphid colonisation
esfenvalerate (50g/L) Sumi-alpha 100-300mL Use high rate in high risk areas, apply three and seven weeks post emergence
gamma-cyhalothrin (150g/L) Trojan 10 or 15mL Apply sprays four and eight weeks after emergence to reduce aphid colonisation
lambda-cyhalothrin (250g/L) Cyhella, Flipper, Karate Zeon Tech, Kung Fu, Lambda, Lamdacyhalothrin, Matador with Zeon Tech 12 or 18mL Apply sprays four and eight weeks after emergence to reduce aphid colonisation
sulfoxaflor Transform 50-100mL Do not apply to crop later than the flag leaf stage
Table 2 Seed dressing application for control of aphids in cereals (refer to labels for dilution rate)
Active ingredient Products Rate per kg seed Remarks
Imidacloprid 600g/L Confederate, Emerge, Gaucho, Genero, Guardian, Immi 600, Impressor 600, Imida 600, Imidacloprid 600, Inflict 600, Nuprid, Picus, Protectaflo, Savage 600, Senator 600, Imi- Flow, Zooter 600 (seed dressings) 120 or 240mL/100kg seed Higher rate for increased length of control in high risk areas. A synthetic pyrethroid top-up spray is recommended to be applied 7-8 weeks after sowing imidacloprid treated seed for control of aphids vectoring barley yellow dwarf virus (BYDV)
Thiamethoxam (210g/L) + Lambda-cyhalothrin (37.5g/L) Cruiser Opti seed dressing 165-330L/100kg Higher rate in areas where higher pest pressure is expected or longer period of control required

Insecticides for aphid feeding damage control

  • Direct feeding damage occurs when colonies of aphids develop on stems, leaves and heads, usually in the tillering and later stages of crop growth through to head filling.
  • Once aphid populations become established in a crop, higher rates of insecticides are required to reduce high aphid populations and to minimise their feeding damage.
  • The recommended threshold to apply insecticide is 50% of cereal tillers have 15 or more aphids and crops are expected to yield three tonnes/ha or more.
Table 3 Registered insecticides for aphid feeding damage control
Active ingredient Product Rate per hectare Remarks
beta-cyfluthrin (25g/L) Bulldock 500 or 1000mL Use higher rate when applying to dense crop with yield greater than 3t/ha and aphid populations are at threshold

Chlorpyrifos 300g/L and

L-cyhalothrin 15.4g/L g/L
Cobalt 200 or 300 Use higher rates if threshold is exceeded
dimethoate (400g/L) Danadim, Dimetholinx, Dimethoate, Dimethoate 400, Dimethoate Insecticide, Rover, Saboteur, Stalk 500mL  
gamma-cyhalothrin (150g/L) Trojan 10-15mL Use higher rates if threshold is exceeded
lambda-cyhalothrin (250g/L) Cyhella, Flipper, Karate Zeon Tech, Kung Fu, Lambda, Lamdacyhalothrin, Matador with Zeon Tech 12-18mL Use higher rates if threshold is exceeded
pirimicarb (500g/kg) Atlas, Aphidex 500, Piricarb WG, Piri-Ken, Pirimicarb 500, Pirimidex, Pirimor WG 250-300g Apply if aphids have reached threshold and crop is between emergence of last leaf and flowering stages. Application of pirimicarb at temperatures greater than 15°C may give better control.
sulfoxaflor Transform 50-100mL Do not apply to crop later than the flag leaf stage

Disclaimer

The insecticides listed are emulsifiable concentrates (EC). Any omission of an insecticide or trade name is unintentional. The mention of trade names does not imply endorsement or preference for any company’s product by the Department of Primary Industries and Regional Development. The recommendations/registrations are valid at time of publishing.

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