No. 3, January, 1922] PATHOLOGY 197 



1305. Blair, R. J. Prevention of decay in the timber of pulp and paper mill roofs. Paper 

 Indust. 1 : 837-841, 854. Fig. 1-6. 1920. — The author gives a description of the types of roofs 

 commonly used and the defects therein; also the causes of, and methods of preventing, 

 decay. — H. N. Lee. 



1306. Cross, Wm. E. The Java-Argentina seedling sugar canes. Louisiana Planter 66: 

 184. 1921. — Some of the Java sugar cane seedlings have largely replaced other varieties in 

 Argentina as they are superior in many ways, notably in their greater resistance to mosaic and 

 root rot. — C. W. Edgerton. 



1307. Detwiler, Samuel B. White pine blister rust control. Amer. Plant Pest Committee 

 Bull. 6: 1-6. fl921?J. — This summarizes the relation of currants and gooseberries to the 

 spread of the rust and the results obtained by eradicating these alternate hosts. — Methods of 

 eradication are given and arguments advanced for the general use of these methods by all 

 owners of white pine in the northeastern U. S. A. — Investigations underlj'ing these control 

 recommendations were more fully treated in Bulletins 2 and 4 (see Bot. Absts. 3, Entries 393, 

 396, 416, 417; and 7, Entries 1140, 1203, 1224, 1246).— TF. H. Rankin. 



1308. Edgerton, C. W., and G. L. Tiebout. The mosaic disease of the Irish potato and 

 the use of certified potato seed. Louisiana Agric. Exp. Sta. Bull. 181. 15 p., fig. 1-3. 1921. — 

 In Louisiana the mosaic disease of potatoes considerably reduces the yield of the Bliss Triumph 

 variety, a 50 per cent loss being not uncommon. The mottled appearance of the leaves is com- 

 mon early in the season, but with the approach of warm weather the leaves appear merely 

 curly. The dwarf stage is very common. The Triumph is the only variety extensively grown 

 in Louisiana which is seriously affected by the mosaic, which has occurred there since 1909. 

 Fields from the ordinary commerical Triumph seed which is shipped into Louisiana from the 

 northern U. S. A. generally show a percentage of mosaic plants as high as 50-95. — Certified seed 

 has given variable results. The majority of the lots of certified seed tested have been superior 

 to commercial seed, though some have been very poor, giving a very high percentage of mosaic. 

 Growers, also, have had variable results with certified seed; in 1921 some growers did not recover 

 their seed. It is recommended that growers pay more attention to t"he certificates of the seed 

 producers, refusing to buy seed showing more than a minimum of mosaic. — C. W. Edgerton. 



1309. Edwards, W. M. O. Giving medicine to trees. Florists' Exchange 50: 1078. 1920. 

 — The writer, replj'ing to previous notes on this subject (Florists' Exchange 50: 327) in which is 

 pointed out the futility of injecting chemicals into trees to control diseases, claims that strong 

 perfumes such as musk and apple oil soon check and destroy any blight. A soluble substance 

 introduced into the sap penetrates to every part of the tree, although with diminishing strength. 

 This is made use of in treating trees, enabling them to repel certain diseases for some time. 

 Treatment has been successful in many kinds of trees, including chestnut (for blight 

 — Endothia parasitica) , apple, pear, peach, larch, hickory, and birch. At one time the writer 

 had a number of young chestnut trees growing in tubs, all of which were more or less affected 

 with blight, but when watered with various solutions (not named) 8 outgrew the disease. — 

 L, A. Minns. 



1310. Fisher, D. F. Controlling brown rot of stone fruits. Better Fruit 15: 3-4, 15. Fig. 

 1-2. 1921. — This disease, manifesting itself as twig and limb cankers and especially "blossom 

 blight," which materially reduces the set of fruit, is a most serious menace to stone fruit 

 crops in northwestern U. S. A. because of its attacks on ripening as well as immature fruits. 

 The life history of the fungus is described, and preventive measures, such as destruction of 

 mummies and open pruning, are suggested. Self-boiled lime-sulphur 8-8-50 is suggested as the 

 safest and best fungicide for controlling this disease. — S. M. Zeller. 



1311. GouAiDC, C. B., AND OTHERS. Report of committee on agricultural progress of the 

 Louisiana Sugar Planters ' Association for the year 1920. Louisiana Planter and Sugar Manufac- 

 turer 66:185-189. 1921. — This includes a discussion of the sugar cane mosaic, its spread in 



