The Rhizoctonia Damping-Off of Conifers 



53 



were applied per square foot, respectively, were practically ruined through 

 bird injury. Examination of the seedlings showed no evidence of stunting, 

 even with the larger applications. 



White pine — Treatments with dry chemicals. White pine was used, 

 along with red pine and norway spruce, in the preliminary experiments 

 with seed and soil applications of copper carbonate and several organic 

 mercury dusts during the spring of 1926. The results obtained were less 

 favorable than those with the other two species, there being lower absolute 

 yields in some of the treated plats than in the checks. 



During the spring of 1927 an extensive series of tests was conducted with 

 applications of aluminum sulfate and a number of mercury materials. 

 Seed of very low viability was sown on May 12, at the rate of 1800 per 

 plat. The results of the experiment are recorded in table 18. Here 



TABLE 18. Treatments with Dry Chemicals on Beds op White Pine Sown at the 

 Keene Nursery on May 12, 1927 



* Treatments 13 and 15 are equivalent in mercury content, as are also treatments 14, 16, and 17. 

 t Applied in 250 cc. water immediately after seeding. 



