He is internationally known for his work on insecticide resistance management and the development of IPM programs in field and vegetable crops, including grapes.
Toscano's work focused on insect resistance management, alternatives to insecticides, sampling and monitoring techniques, insect and plant development, economic thresholds, and insecticide effects upon plant development. His laboratory developed and synthesized this vital information for distribution to growers to encourage the use of multiple pest control strategies and monitoring techniques to maximize crop production while minimizing costs and impacts to the environment. In 2000–2001, he developed and implemented a program to manage the glassy-winged sharpshooter, a vector of the bacterium that causes Pierce’s Disease in grapes. He has published more than 250 articles in peer reviewed and technical journals.