No. 1, July, 1920] patholo<;"> 187 



stock yard manure applied the spring before. Probably in met of thecal <<n the plants 



might have escaped serious injury from stem mt if i hey bad ool bad ' heir groM I h checked by 

 unfavorable condil ions of soil, and the ravages <>f the tarnished plan! bug. There is a decided 

 difference in the susceptibility (if t lie various types o1 em rot. It might be possible 



to select strains from t Ik- more resistant sorts that would be praol ically immune. L. A . lfti 



1233. Atanasopp, D., AND A. G. JOHNSON. Treatment of cereal seeds by dry heat. Jour. 

 Agric. Res. 18: 379-390. /'/. 48-49. 1920.— Preliminary data indicate thai seed of the cereals 



— barley, wheal, rye and oats — when of g I quality and well dried will withstand protracted 



exposure to dry heat at comparal Lvely high temporal ore (30 hours at 100°). lin>/, ,, ,, m trans- 

 lucens, causing blight of barley, and Pseudomonae averuu , causing blight of oats, are killed 

 by baking at a temperature which is not injurious to the seed. The following seed-borne 

 fungous diseases are practically eliminated, so far as primary infection is concerned, by the 

 treatments: wheat scab (Gibberella saubinetii and Fusarium spp.) and spot blotch of barley 

 (Helminthosporium sativum). Net blotch (//. teres) and stripe disease (//. gramint um) of 

 barley, blotch of oats (II. avenac-sativae) , loose smut of barley and the smuts of oats are 

 reduced very materially by the treatment. — D. Reddick. 



1234. Bahk, Fritz. A sure cure for damping oil. Florists' Exchange 47: 350. 1919. — 

 Mix the soil for seed sowing, soak thoroughly with formaldehyde at the rate of one fluid ounce 

 to a quart of water, and let dry out before using; also soak pans, pots and drainage crock 

 in the same solution. — L. A. Minns. 



1235. Baker, C. F. Hevea versus fungi. Gardens' Bull. Straits Settlements 2: 109-113. 

 1919. — Twenty-eight fungi are listed which are found associated with Hevea brasiliensis, Hevea 

 or Para rubber; ten of the fungi were found to be new species and one a new genus, the deter- 

 minations of the author's collections being made by Saccardo. Emphasis is placed upon the 

 importance of adequate investigation of fungous diseases of this tree. — S. F. Trelease. 



1236. Baker, C. F. Mango pests in Singapore. Gardens' Bull. Straits Settlements 2: 

 115-116. 1919. — Mangoes are severely attacked by three pests: a psyllid, and two fungi — 

 Meliola mangiferae and Zimmermanniella trispora. — S. F. Trelease. 



1237. Ball, E. D. The potato leafhopper and the hopperburn. Phytopath. 9: 291-293. 

 1919. — The burning and upward curling of the tips and margins of foliage of potato and other 

 hosts is attributed to the work of leafhopper (Empoasca mali). Eggs are deposited in the 

 midrib of the leaf from which nymphs emerge in a week or tw T o. The injury to the veins causes 

 death of the margins. Plants caged with the insects showed burn after three days while in- 

 fected plants caged free from insects recovered. The injury was widespread in 1918 and in 

 all cases examined leafhoppers were associated with the injury which appeared in certain rows 

 and varieties rather than according to sun exposure or soil conditions. Black-Leaf-40, 1:S00 

 with the addition of 5 parts of soap proved an effective spray. — Maude Miller. 



1238. Batchelor, L. D., and H. S. Reed. Winter injury or die-back of the walnut. — 

 California Agric. Exp. Sta. Circ. 216. 20 p. 1919.— See Bot. Absts. 4, Entry S98. 



1239. Baumanx, E. Zur Frage der Individual- und der Immunitats-Zuchtung bei der 

 Kartoffel. [Individual selection and immunity breeding in potatoes.] Fiihl. Landw. Zeitg. 

 67:246-253. 1918. — The first step in improving potato culture consists in selecting from among 

 the very numerous varieties certain ones which are high yielders and which possess high 

 resistance. This is most satisfactorily accomplished by separating varieties into vegetative 

 lines which permit testing of the hereditary characters of both normal and pathological nature; 

 this leads to a better knowledge of certain varieties and provides data which are of direct value 

 in special breeding work. Experimental data covering a number of years are presented in 

 support of the conclusion. — Ernst Artschwager. 



