Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Trees and Timber 399 juring the lower branches of large trees; serious damage, however, is not common. Damping-off {Fusarium sp.). — The general characters are those mentioned under damping-off. It is serious in Fig. 211. — Cronartium ribicola on pine show- ing sporiferous pustules. After Colley. Vermont, New York, Missouri, and probably in many other states, killing the seedlings in nurseries as soon as they ap- pear above ground. The beds should be given all ventilation possible. A top-dress

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Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Trees and Timber 399 juring the lower branches of large trees; serious damage, however, is not common. Damping-off {Fusarium sp.). — The general characters are those mentioned under damping-off. It is serious in Fig. 211. — Cronartium ribicola on pine show- ing sporiferous pustules. After Colley. Vermont, New York, Missouri, and probably in many other states, killing the seedlings in nurseries as soon as they ap- pear above ground. The beds should be given all ventilation possible. A top-dressing of steriHzed sand sprinkled over the beds immediately after germination resulted in 30 per cent of disease against 42 per cent in the untreated part. For dis- infection of soil, see p. 460.

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