The purpose of this rule is to establish procedures for propagating male Casuarina cunninghamiana trees in nurseries to be used as windbreaks around commercial citrus groves, and permitting procedures that grove owners or operators must follow to plant and maintain Casuarina cunninghamiana windbreaks in designated areas of Indian River, Martin and St. Lucie Counties. The effect will be to provide fast growing trees to serve as windbreaks to protect citrus groves in those counties from the spread of citrus canker disease while ensuring that the Casuarina cunninghamiana trees will not spread into and disrupt the environment.