KITCHEN CUPBOARD ROSE SPRAY
The following formula is effective in preventing and controlling the spread of powdery mildew and black spot on roses. We highly recommend that you use it as a preventative measure against these common fungal problems. In other words, spray susceptible plants before you see symptoms. If your rose or roses already show symptoms, remove and destroy affected leaves and begin spraying with this formula on a weekly basis. Always spray the plants after sundown, and do not spray when the weather is hot (upper 70s and above.)
1 gallon of water
1 Tablespoon canola oil (or safflower oil)
1 ½ Tablespoons baking soda
This spray is not effective against insects. If you have aphids on your roses, blast them off with a strong stream of water from your garden hose. Repeated every three to four days, this treatment is very effective in controlling aphids. The spraying kills many of them, and those that land on the ground are easy prey for hungry spiders and other predatory insects. A regular regimen of spraying should significantly reduce the population of aphids on your roses. Those remaining should provide sustenance for any ladybugs that you may introduce to the garden.