Uniformity of Nursery Stock Fumigation Requirements

Recommendations for fumigating nursery stock in the different states vary considerably in the strength of hydrocyanic acid gas to use and the time of exposure necessary. The variations in temperature and humidity throughout the United States would not permit of standard fumigation regulations for the entire country. It would seem desirable for the states in each section (for example, the Southern States) to adopt similar fumigation requirements for each kind of plant to be fumigated. Suggest further experiments to determine the fumigation schedule that could be adopted in each group of states in the country.