. Damping-off in forest nurseries. Plant diseases; Trees. DAMPING-OFF IX FOREST NURSERIES. 31 probable error. Peltier's results permit similar correlations for the 18 strains common to his experiments 1 and 1A on carnation cuttings and for the 22 strains common to experiment 1 on cuttings and ex- periment 2 on seedlings. The coefficients found are decidedly lower than those obtained from the experiments on pine. ± for the experiments on cuttings and ± for the comparison of the results on cuttings with the results on seedlings, hut neverthe- less indicate some interexperiment
. Damping-off in forest nurseries. Plant diseases; Trees. DAMPING-OFF IX FOREST NURSERIES. 31 probable error. Peltier's results permit similar correlations for the 18 strains common to his experiments 1 and 1A on carnation cuttings and for the 22 strains common to experiment 1 on cuttings and ex- periment 2 on seedlings. The coefficients found are decidedly lower than those obtained from the experiments on pine. ± for the experiments on cuttings and ± for the comparison of the results on cuttings with the results on seedlings, hut neverthe- less indicate some interexperimental correlation for the same strains and therefore inherent differences in parasitic ability between the dif- ferent STRftf/VS OFCORT/C/UM l/rfGUM Pig. 11.— Diagram showing the comparative virulence of 20 strains of Corticium vagum in two successive inoculation experiments on Pinus resinosa. The results in experiment Xo. 71 are shown by the solid line, the strains being arranged from left to right in the order of descending virulence indicated by the number of seedlings surviving in this experiment. The results from the use of the same strains in experiment Xo. 72 are shown by the broken line. The obvious correlation between the two curves (coefficient ±) indicates a real difference in virulence between the different strains. The strains indicated by the underscored numbers are original strains and those not under- scored reisolations from the original strains in earlier inoculation experiments on pine seedlings. In the work on pine seedlings, with the possible exception of strains 230 and 233, there was no evidence of attenuation in arti- ficial culture. Strains 147 and 213, isolated in 1910 and 1911, re- spectively, seemed as strongly parasitic in experiments 71 and 72 (1917 and 1918) as any of the five strains isolated in 1916 or the six strains isolated in 1915. Of the 20 strains above mentioned, three pairs were isolated under such conditions and show
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