Using Natural Insect Repellents
There are several natural insect repellents that often kill cankerworms on contact, but also serves as a repellent by creating a bad taste for the critter and make it go someplace else to munch. Neem Oil Soap, Hot Pepper Wax, and Garlic Barrier all have this potential repellent capability when applied properly on the tops and the bottoms of leaves of the target plant. The repelling effect will last for several weeks to a month depending on the weather conditions. See the Natural Repellents in Yardener's Tool Shed.
Using Natural Insecticides
AzaMax will control Cankerworm
AzaMax is a natural product with a broad spectrum of pest control and broad plant applications. AzaMax is an anti-feedant and insect growth regulator which control (kills) pests through starvation and growth disruption within two or three days. Therefore this product is used when the bugger is chomping on the foliage. Any of the sprayers can be used to apply AzaMax
For more information about AzaMax go to the Yardener's Tool Shed; click here
Neem oil soap is a natural insecticide that will kill cankerworm on contact and then repel new arrivals for about 2 weeks. Pyrethrum is made from chrysanthemum blossoms and is quite effective especially when applied directly to the pest.
Light horticultural oil is effective in smothering [insect]. Go to the Natural Insecticides section in Yardener’s Tool Shed for details on each product.