Spraying the larvae with horticultural oil or insecticidal soap will kill the larvae. Complete larval coverage is necessary for effective kill. Horticultural oil (light weight) suffocates insect larvae, has a residual of a few days, and has very low mammalian toxicity (Ball and Ball, 1989).
What does sawfly damage on roses look like?
Sawfly larvae chew a thin layer off the surface of leaves, leaving a skeletonized appearance. If you hold up an affected leaf, you can see light shining through it. This unique “window pane” damage is a classic sign of sawflies. If you look carefully, you might even find a few, tiny, slug-like larvae on the leaves.
Are sawflies good or bad?
Role of sawflies and woodwasps in gardens
Sawfly larvae provide food for some birds and other insect feeders; they are also attacked by some parasitic wasps and flies. Some sawflies can be damaging to garden plants, particularly those with larvae that can cause extensive defoliation.
What can I spray on my roses for bugs?
Mix one tablespoon of vinegar with one cup of water. Add one and a half tablespoons of baking soda plus one tablespoon of dish soap and one tablespoon of vegetable oil (or any other cooking oil). Stir this mixture into one gallon of water, and spray it on your roses’ foliage.
What is eating the leaves on my rose bush?
Number-One Nuisance: Among roses, aphids are the most common pest. These hungry insects feast on rapidly growing plant parts such as buds and shoots, especially in spring and early summer. In moderate to high levels, aphids secrete large amounts of honeydew, which can cause a sooty mold that blackens leaves.