Abstract
The following substances proved fungicidal for the conidial stage of the hop mildew ( Sphaerotheca Humuli ): (1) Liquid paraffin at 2 per cent. emulsified with soft soap. The spray is harmless, or dangerous, to foliage according to the conditions (probably temperature) in the greenhouse. (2) Medicinal paraffin, emulsified with 0·75 per cent. castor-oil soap, is not quite fungicidal at 3 per cent. (3) “Summer solol”, a proprietary mineral-oil preparation containing 61·6 per cent. by weight high-boiling petroleum oils, is fungicidal at a concentration between 2·5 and 3 per cent. when 0·5 per cent. soft soap is added to confer satisfactory spreading properties. At this concentration no injury to the leaves was caused. (4) “Volck”, a proprietary petroleum-oil preparation containing 80·0 per cent. by weight mineral oils, is fungicidal at 2·5 per cent. With either 0·5 per cent. soft soap or 0·5 per cent. Agral I. Injury may be caused under certain conditions.
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