. Fig. 4.—Cotoneaster stems with blight cankers. disease on pear and apple. Cankers are formed on the stems (fig. 4). The cause is Erwinia amylovora.4 Diseased parts should be cut off, the cuts being made several inches be- low the affected portion. Cutting tools should frequently be swabbed with a rag saturated with corrosive sublimate 1-1,000 (p. 100). Several species of cotoneaster are highly resistant or immune to blight, such as forms of Cotoneaster buxifolia, C. Franchettii, C. glaucophylla, C. Har- roviana, and C. microphylla. Some of these may be substituted for the 4 For more complete
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. Fig. 4.—Cotoneaster stems with blight cankers. disease on pear and apple. Cankers are formed on the stems (fig. 4). The cause is Erwinia amylovora.4 Diseased parts should be cut off, the cuts being made several inches be- low the affected portion. Cutting tools should frequently be swabbed with a rag saturated with corrosive sublimate 1-1, 000 (p. 100). Several species of cotoneaster are highly resistant or immune to blight, such as forms of Cotoneaster buxifolia, C. Franchettii, C. glaucophylla, C. Har- roviana, and C. microphylla. Some of these may be substituted for the 4 For more complete information see: Thomas, H. E., and P. A. Ark. Fire blight of pears and related fruits. California Agr. Exp. Sta. Bui. 586:1-43. 7 figs. 1934.