What would be a safe cucumber beetle insecticide to spray directly on the plant?
We have several good cucumber beetle insecticides. Organic gardeners have long known about INSECTICIDAL SOAP which works Ok. It can be used over and over as needed but it doesn't seem to last long and it's not the best organic choice. Two newer products which work really well are the 3 IN 1 and the MULTI PURPOSE INSECT KILLER. Both are concentrates and very effective on a wide range of garden insects so they can handle any problem you might have.