Monitoring should begin early. Look for folded or rolled leaves among the plants. The leaves may be discolored or show some feeding damage such as small holes in the leaves. Pick the rolled leaves carefully and examine for leaf roller larvae. If the rolled leaves do not have any larvae present, it is too late to control the larvae.
Now you will be dealing with the adults, spraying would be ineffective and costly at this time. Inspect branches and twigs showing as new foliage emerges and look for signs of feeding, as well as the tiny caterpillars. Look for egg masses, and check them for signs of larval exit holes. Fruit trees should be sprayed no later than petal fall to prevent leafroller larvae from injuring developing fruit.
Diverse gardens that also attract many natural native predators by mingling varying plants and flowers blooming at different intervals throughout the season are advantageous.
When there is evidence of a leafroller infestation, such as early spring defoliation, foliar sprays are of little use because the most common species of leaf rollers produce only one generation annually, by the time defoliation is noticed the caterpillar stage is generally completed.
Bt Bacillius thuringiensis, is sold under a variety of trade names, and is effective against the larval stages of leafrollers. Bt does not harm beneficial insects, pets or people. Leafrollers will cease eating within hours after feeding on a sprayed leaf and die within a few days.
Insecticidal oil sprays applied during dormancy will help control leafroller eggs on fruit trees.
is another eco-friendly insecticide that is effective against leafrollers and is also widely available.
Other products used against leaf rollers are
Proper sanitary practices are vital to the health of your garden. Proper sanitation can help to ensure disease-free pest-free and productive gardens. Try to keep the garden free of any diseased dead or damaged plant materials. Remove cuttings from pruning and trimming and either destroy them - if diseased, or send them to the compost pile. Leaving rotting fruits and vegetables in the garden is like a written invitation to unwanted pests and diseases.
If a diseased or dead plant part has to be cut, the microorganism that caused the problem is probably on the tool you just used. Like a surgeon, sterilize all tools by washing in soap and water - rubbing alcohol wouldn't hurt either. If you pinch off diseased plant parts, wash hands before handling any other plants. Keep Weeds under control. Till the soil in the spring before planting to expose and kill larvae that wintered over in the soil.