Grub control treatments

(Question)

My garden care company wants to treat my lawn for grubs and I was wondering if I should go ahead and do the treatment as it is $100.  I have not seen any signs of gurbs, brown patches of dead grass or animals digging up the lawn, so I want to know what the treatment is and if it is really necessary?

 

 

(Answer)

I believe your garden care company may want to treat your lawn with a spray containing nematodes but it would be wise to check that this is indeed the case by calling them.

Nematodes are used to treat chinch bugs, chafers and beetles in lawns.  Treatment using a spray application is, at best, about 50% effective in reducing an infestation as there are a number of factors that need to be taken into consideration.  Nematode treatments should be done in mid August when the soil temperature is above 30 degrees C so the timing of the spraying is vital.  Nematodes also have a short shelf life as their life cycle is between 2 to 5 days so if they don’t find a host (grub) within that time, they die.  They also need to be kept stored in a fridge before they are sprayed onto a freshly irrigated lawn and also watered well after their application.  Careful attention to the number of nematodes for the treatment site area must also be calculated and treatment should be done under overcast conditions.

The above being said, nematode treatments have, by and large, been a hit and miss affair.  If you have seen no evidence of a grub or beetle infestation in your own lawn, it might be wise to ask your garden care company if there is a problem locally in your immediate neighbourhood or if they have seen evidence of activity in your own lawn which they could show you before you consent to any treatment.  $100 is a lot of money to spend if you don’t really need to, so it is wise to ask.