Grubs: ‘Shrimp cocktails’ for skunks

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“If you kill off the natural enemies of garden pests you inherit their work.” - Anonymous

On a recent trip to Halifax a man sitting two seats behind me on the plane asked if I knew what insect was causing the perfectly round holes in his lawn that seemed to appear overnight.

Grub

As I generally do under these circumstances I asked a few questions before jumping to conclusions.

The holes were the size of a nickel across and a couple of centimetres deep.  They were randomly spaced and every few holes had been expanded and ‘ripped apart’ as if someone had put a firecracker in the hole.  “It is not an insect. You have a skunk.” I concluded out loud to the horror of the man who asked, perhaps regretting that he had brought it up. The people on the plane around us had a silent chuckle. What is it about a skunk that makes people laugh? Like standing on a rake and hitting yourself in the head, it is always funny when it happens to someone else.

For the most part I find skunks harmless creatures. Their biggest problem is that of public relations: they stink. The holes in the lawn are the result of a hungry and curious skunk that is literally sticking its nose in your business (i.e. lawn) looking for grey and white grubs. Once it smells one with its finely tuned, perfectly round little nose it digs up the grass and soil until it exposes it for a little ‘shrimp cocktail.’ Much worse, in terms of damage to your lawn, is that caused by a racoon for the same purpose. 

Skunks and Racoons

Both racoons and skunks eke out a living by foraging for grubs. And this is prime grub season. The larvae of the June beetle (grey grub) and the European Chafer (white grub) are interesting in that they are both migratory and constantly changing. Unlike birds which fly south in the winter, the grub migrates through the soil during the gardening season, moving close to the surface this time of year as they seek out the young white roots of your lawn in their desire to find a meal. 

Dinner Time

If the skunks and rodents are coming to dine at your place I have some good news for you. With the grubs up near the surface of the soil this is the perfect time for grub control.  In the absence of chemical control for grubs we now use beneficial nematodes. These are microscopic organisms that you water into the lawn.  Literally they feed on the backs of the grub and make a meal of them (in this story it seems that everybody is eating everybody). The beneficial nematodes are the ‘good guys.’ I remind you that over 90 per cent of the insects in your yard and garden are beneficial and do not do harm to your plants. 

Natural Born Killers

Nematodes are sold at your local garden retailer from a beer fridge. While kept at cool temperatures they remain dormant and awaken when brought out to normal temperatures.  A package of nematodes may read, “Contains 10 million natural born killers.” They are sold in a small box in which a smaller plastic envelope containing an even smaller sponge is saturated in the microscopic organisms. These nematodes are harmless to people, plants and pets. They occur naturally in the soil: you are just adding to an existing population in your efforts at grub control. As long as there are grubs to feed on, the nematodes persist in the soil. When your grubs are gone the nematode population declines naturally.

It should be noted that a thorough drenching of your lawn is in order, before and after the application. Apply at least an inch of water as this will force the nematodes deep into the root zone of your lawn where they can seek out and destroy the grubs. 

 

Mark Cullen appears on Canada AM every Wednesday morning at 8:40. He is spokesperson for Home Hardware Lawn and Garden.  Sign up for his free monthly newsletter at www.markcullen.com.

Organizations: European Chafer

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