The maple bladder-gall (Phyllocoptes quadripes) is readily susceptible to applications of lime-sulphur while the spruce gall-aphid (Chermes abietis) is readily susceptible to applications of lime-sulphur and of oil emulsions. Experimental work of the past three years demonstrate the ease with which these pests may be controlled. Evidence at this time, however, appears to indicate that certain proprietary oil emulsions may cause some shedding of the foliage on spruces although the effect does not seem serious.
Document Type: Research Article
Publication date: August 1, 1925
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