What cures are out there for getting rid of japanes beetles. Is a nematode treatment done in fall the only solution to kill them off? They have devoured my garden. Thanks!
Hello, I am sorry to hear about the damage Japanese beetles have done to your garden. We have been hearing a lot from gardeners about this problem , and if it is of any comfort, many others are having the same issues. Here is a reply that was posted from our website a short time ago on the same topic, I hope it is of some help.
“This is a common question posted at this time of year. The Ontario Ministry of Agriculture and Food has a website at the bottom of which there is a lists of plants that are most susceptible to damage by this insect. To control Japanese beetles you can either control the adult or the larvae. the best method (although still time consuming but strangely satisfying) is to go out in the early morning or in the late evening when they are not as likely to fly around and simply knock them into a small bucket/jar of water (add a few drops of soap) where they drown. You will need to begin this process at the end of June or the beginning of July and continue until sometime in early August. After that, the next method of control is to go after the larva. Nematodes are best applied in August and are watered into the affected area. They attack the larva of Japanese beetle, June bugs and European chafer all of which racoons and skunks like to dig up the lawn in search of. When applying nematodes it is important to keep them refrigerated until you are ready to apply them. Ideally they should be applied on an overcast morning or evening. If the lawn is dry it should be irrigated first with about ½ to 1 inch of water. You should prepare and use the entire pack and water (while agitating) them into the soil. You might need to irrigate the lawn again to “wash” the nematodes into the soil. You can also reference our other responses to this problem at Roses and Grey Grubs in the Lawn“