Abstract

Standard control measures of other sections fall down because of low temperatures and high winds. Various dosages of calcium cyanide were tried out from the standpoint of shortening of time period of exposure with regard to the possibility of fumigating beneath cheap tar paper covers. Heating of nicotine sprays and of nicotine dusts seem to offer promising results in sections with cool temperatures in the growing season. Increased efficiency or greater dilution and cheaper treatments are considered as possibilities of the use of heat.

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