Archive image from page 14 of Damping-off in forest nurseries (1921). Damping-off in forest nurseries dampingoffinfore00hart Year: 1921 TUMPING-OFF IN FOREST NURSERIES. 11 Something is already known aboul the seed Fungi of herbaceous plants ('(. 91), broad-leaved trees (7». 92'), and juniper (95). RELATIVE IMPORTANCE OF THE DIFFERENT TYPES. Of the types of damping-off described in the foregoing pages the first two are ordinarily the most important. Late damping-off is rarely as serious as the normal type of damping-off. Top damping is only of importance in eases of excessive and unusual atmo
Archive image from page 14 of Damping-off in forest nurseries (1921). Damping-off in forest nurseries dampingoffinfore00hart Year: 1921 TUMPING-OFF IN FOREST NURSERIES. 11 Something is already known aboul the seed Fungi of herbaceous plants ('(. 91), broad-leaved trees (7». 92'), and juniper (95). RELATIVE IMPORTANCE OF THE DIFFERENT TYPES. Of the types of damping-off described in the foregoing pages the first two are ordinarily the most important. Late damping-off is rarely as serious as the normal type of damping-off. Top damping is only of importance in eases of excessive and unusual atmospheric moisture, so far as the writer's experience indicates. In the Middle West it has proved relatively insignificant. The three types which Fig. .—Nearly complete destruction of the seedlings of Pinua banksiona at an unusually early aye, at Garden City. Kans. (Photographed by Dr. J. V. Hofmann.) occur after the seedlings appear above the soil surface can, of course, be evaluated by frequent counts during the damping-off season. This has apparently not yet been done by anyone. However, in experi- ments on damping-off control by soil disinfection, data have been obtained on comparative emergence (number of seedlings appearing above the soil surface) in treated and untreated plats and on the total parasitic losses after the seedlings appear which permit a certain amount of analysis of the losses due to damping-off parasites. The data from five nurseries bearing on (his point are presented in Table I.
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