beetles in soil #144972
Asked August 03, 2013, 8:43 AM EDT
My rose bushes were beetle ridden. I sprayed with Ortho Rose and flower insect killer along with several beetle catchers hoping to rid the problem; however, both were only semi effective. As I was weeding around the base of the bushes, beetles were burrowed in the soil. Please help as I have no clue what to do next to rid my soil of these pests, to literally get to the base of the problem. Thank you in advance.
Kent County Delaware
You really have a 2 part problem - getting rid of the adults and than getting rid of them in the soil. For the adults: Step one is Neem oil applied to plants the beetles feed on every 1-2 weeks depending on the amount of rain. The neem oil seems to persuade the hordes they really do not want to eat the plant, but some still will.
Step two is a daily garden walk. Sometimes you can squish them, but if there are more than one or two, you can use a small bucket of soapy water and knock them into it. They do not escape, they just die. I prefer the bucket to finger squishing when there is more than one in an areaStep 3 are the chemical pyrethrins used sparingly and only on those plants the beetles seem to be doing the most damage to. You will want to follow the package directions exactly when applying.
For the beetles in the soil, they are now in their reproductive stage and are laying their eggs in the soil. You can pick out the adults and drop them in soapy water and/or you can wait until the grubs have hatched. You will want to wait until late August or September and than decide which way you want to handle the grub problem..