Chafer Grub

Adult beetles of the Garden Chafer Phyllopertha horticola emerge in May / June and mate. Females burrow into the ground to lay their eggs. Eggs hatch about 4 weeks later forming characteristic "C" shaped grubs - staying close to the soil surface until early October after which they move deeper to hibernate. They pupate the following April. 

Chafer grubs cause damage to turf by feeding on roots and by predators (rooks, crows etc.) feeding on the grubs. Affected turf may have all roots severed. Predators may tear at the turf removing divots to expose the grubs causing further damage.

Nemasys Chafer Grub Killer /Nemasys G (heterorhabditis spp)
Type: Insect parasitic nematodes. 

How it works: The spray application releases nematodes which seek out insect larvae / grubs in the soil entering them through natural openings. Once inside they release their symbiotic bacteria killing the grub. Nematodes multiply in the dead organism releasing a new generation. 

Species controlled: The Garden Chafer Phyllopertha horticola present in turf. Other species of Chafer such as the Cockchafer Melolontha melolontha may not be adequately controlled owing to differences in life cycle. 

When to use: In accordance with the Garden Chafer life cycle - when the larvae are close to the soil surface and when the soil surface is above 12°C. Typically treat from August to September. Later applications and the larvae may be too deep to be targeted and soil temperatures too low. Apply to wet ground (irrigate if required and afterwards). Nematodes must pass through the thatch layer and into the soil and need to be kept moist for 2 - 3 weeks. Nematodes are sensitive to sunlight so apply late in the day. Damage prevention will be noted the following spring when most damage is usually seen. 

Rates of use: 50 million pack treats 100 m2, 250 million pack treats 500 m2.

Garden Chafer Grubs (Photo: Becker Underwood)Garden Chafer Grubs (Photo: Becker Underwood)