DISEASES OF PLANTS. 4 ( .) 



ofthefroil nexl the stalk was little injured, while the distal portions were greatly 

 reduced in Bize and killed by the parasite. The leaves Bhowed no trace of dia 



An examination of the fungus on the pari of the second author has l< •< 1 him to the 

 conclusion thai it is an entirely undescribed one, and he proposes for it the name 

 Corynospora mazei n. g. and n. sp. 



From the nature of the disease the authors recommend the use of a dilute solution 

 of copper sulphate or other fungicide, and also the collection and burning of all 

 (li'luis aboul the places of cultivation. 



Apple scab and cedar rust, R. A. Emerson I Nebraska Sta. />'"/. 88, />/>. ?1, figs. 

 d). — This bulletin while describing apple scab and cedar rust is intended principally 

 to record observations Bhowing the results of tests of spraying as a means for pre- 

 venting these diseases. Brief descriptions are given of the appearance of the two 

 diseases, and attention is called to the varying susceptibility of different varieties i I 



apples tO both these diseases. 



Spraying tests were carried on with 6 varieties for the prevention of the apple 

 seal* and the rust, the fungicide used being a 4:4:50 solution of Bordeaux mixture. 

 The results obtained showed thai spraying reduced the proportion of rusted leaves, 

 and the effecl as shown on the yield of fruit indicates that the spraying was very 

 beneficial in reducing the amount of seal*. The rust was held in check even on the 

 varieties that are ordinarily badly rusted. 



The tirst application of Bordeaux mixture should he made when the so-called 

 apples <>n cedar trees are becoming gelatinous ami orange colored, followed by 

 such applications as arc needed, usually a second spraying after an interval of |u 

 days or 2 weeks. In addition to spraying the apple trees the removal of the cedar 

 trees for a considerable distance aboul orchards or, w here this is impossible, the cut- 

 ting out and destruction of the cedar apples is recommended. 



In experiments for the control of apple scab the 2 sprayings recommended for 

 this purpose practically coincide in time with those suggested for the control of the 

 rust. Some Blight difference is noted in the efficiency of later applications for the 

 prevention of the seal*. 



Apple and pear scab, M. ( 1 . Cooke (.lour. Roy. Ilort. Soc. [London], :u i 1904), 

 No. 1-8, j>/>. 91, 92). — Notes are given on the apple and pear scab ( Fusieladium den- 

 driticum ami /•'. pirinum), the habit, external appearance, life history, development, 

 and remedies for which are practically the same, the only difference being those of 

 a microscopical character. 



The author describes the effecl on the host plant, and gives some estimates as to 

 the injury caused by the fungi, after which an account is given of the method- by 

 which the fungus is carried over winter, and the discovery of the perfected form 

 ( Venturia insequalis) is noted. For the prevention of injury by the fungi the author 

 recommends thorough spraying of the trees with Bordeaux mixture or modified eau 

 celeste. 



The brown or bitter pitting- of apples, (i. Quinn (Jour. Agr. "ml Indus. So. 

 A nsL, 8 (inn.',), X<>. /;, /,/,. 805-809). — Attention is called to what is apparently a 

 physiological disorder of apples, which ^roes under the name of brown or bitter 

 pitting. 



This disease has been known in southern Australia for at least L't) years, and is 

 characterized by the appearance at tirst of small, dark-green, depressed areas on the 

 skin of the apple, beneath which the pulp cells become dull brown, dry. of a spongy 

 nature, and dead for several layers of cells in depth. The mosl noticeable develop- 

 ment of this pitting seems to follow the formation of sugar as the apple approaches 

 ripeness. 



A careful examination of diseased specimens tailed to -how any fungus or other 

 organized cause for the disease. Marked difference.- are reported for different varie- 



