European Chafer

Rhizotrogus majalis

These C-shaped grubs are cream coloured with a brown head and six legs. They periodically move up and down in the soil – approaching the surface when it is moist and travelling downward when the soil is dry or when surface temperatures become too cold. Overwintered grub larvae actively feed on grass roots during the early spring, prior to pupation and emergence as adult beetles in June. Newlyhatched larvae feed voraciously from midsummer to early fall.

Turf Symptoms

• Turns yellow, then brown.
• Presence of birds, moles, skunks and other insect-eating animals seeking grubs (the presence of these animals may indicate infestations of other pests).

Control Options

Apply MERIT 0.5G or SOLUPAK just prior to egg hatch.

• Apply MERIT 0.5G at the rate of 560 g/100 m2.
• Apply MERIT SOLUPAK at the rate of 1 packet per 1206 m2
• Water sufficiently (5-10mm of water) following the application to move the active ingredient through the thatch.

Apply SEVIN T&O for curative control of larval stage.

• Apply SEVIN T&O at the rate of 210 to 290 ml per 100 m2 of turf.
• Irrigate following application to ensure movement of SEVIN T&O insecticide into the root zone.
• To optimize curative control, apply SEVIN T&O to the early instar stage of the grub. Alternatively, apply 210 to 290 ml of SEVIN T&O insecticide in 1.5 to 3 L spray volume per 100 m2 of turf and irrigate following application to ensure movement of SEVIN T&O insecticide into the root zone. Remove excessive thatch and irrigate 24 hours before treatment if soil is dry. Contact local agriculture representative for treatment thresholds and timing of application.

To optimize control of European Chafer and Japanese Beetle, apply SEVIN T&O to the early instar stage of the grub.

Grub Control Tips:

• Remove excessive thatch and irrigate 24 hours before treatment if soil is dry, and to bring grubs closer to the surface.
• Irrigate following application to ensure movement of insecticide into the root zone.


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