Zero chemical control of Leatherjackets in your lawn
Last late summer, the adults were flying around and being batted by the Cat but their work as adults is now done! They have laid their numerous eggs in your nice green sward and now they are hatching into hungry larvae ready to start attacking your nice new grass roots. Never ever underestimate the damage that a troop of Leatherjacket larvae can inflict on a grass area.
Sadly, now the EU have banned Bayer Provado active ingredient and also the professional insecticide based on Chlorpyrifos, there are no current EU or UK approved control products to control Leatherjackets apart from Biological Controls such as Nemasys Leatherjacket Nematodes. The same applies to Chafer Beetle Larvae, only biological control and available by contacting Green Gardener online.
At another site, similiar to many that I visit, I viewed a 250 sqm lawn stripped bare by the larvae in the spring time. You can control Leatherjacket larvae now, between the months of October and end of March with a product based on Chlorpyrifos. It will sit in the the soil for up to three or so months and then 'grab' the new larvae as they hatch, thus ending the problem there and then. There is no point renovating a lawn with turf or seed until you have solved the problem as even if you re turf the lawn, if the insect larvae are still in the soil active, they will simply eat the new grass roots that the new turf will develop and hey presto - no lawn!
The fact that there are no chemical controls for Leatherjackets and Chafer Beetle Larvae in lawns and professional sports turf is a very serious problem for all. No point calling your lawn care company, they do NOT have the solution other than Biological control via Nematodes.
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