DISEASES OF PLANTS. 53 



Good results from spraying potatoes, F. II. Hai.l et al. (Neu) York Slate 

 Std. litil. .ill), ixtpuhir al.. pii. lij). — A ])(>i»iil:ir odition of the above. 



Spraying for potato blight in 1905, ('. A. McCuE {Mlchiyan Sto. HuL .i.U>. 

 jt/i. lSl-l->i3, lUjs. 2). — Alter l)ri('t1y (I('scril)inK the caiii-e of potato bli^'ht. the 

 author gives the results of (■xiicriincnts in wliich potatoes were sprayed with 

 Rordeaux iiii.xturc and ((iniparisdns nindc with similar plats receiving a s])i-ay- 

 iiig of linu' watci-. Wiicrc tlic potatucs were jrivi-n 14 sprayings of Bordeaux 

 mixture at intervals of 4 days a net gain of ."fll.'.K) i»er aere is reixirted. Where 

 they were sprayed at intervals of 10 days, (5 ai)|)lieati()ns being given, a net gain 

 of $ir).44 per acre is given. On plats sprayed every 1") days a net gain of $18.38 

 per acre is reported, and where given 4 sprayings at intervals of 20 Ua.vs $11.03 

 j)er acre net gain is reijorted. For the plat whicii received 14 sprayings of 

 lime water at intervals of 4 days ;i loss of ."pl.TO is reported. The cost of the 

 spra.ving is said lo have been 72 rts. per acre for each npjilication. Tliis amount 

 the author believes could be rednced to not more than ~>7) cts. per acre. 



The author gives compiled information relative to sprayiug by individual 

 farmers, the results obtaiianl iit other stations, etc.. and notes that the station 

 expects to carry on exjieriments for the prevention of late blight for at least 5 

 years. 



The spraying of potatoes for iDrevention of leaf blight and rot, E. P. 

 Sanuste.x and J. (i. Milwari) ( Wi.scoii.sin SUi. Bui. 13.5, m). .l), fig-^. 7). — In 1904 

 experiments were begun in spra.ving potatoes for the prevention of blight and 

 rot and continued in l!»(ir), the details of the experiments being described in the 

 bnlletin. In the different ex|ieriments in 10(1") important gains were noted for 

 nearly every tre.ited lot, in sonu' cases the gains ranging from $19.20 per acre 

 to $.■;(■> i»er acre, which were made ;it a cost of less than $4 per acre for spra.ving. 



The control of apple bitter rot, W. M. Scott (!'. »s'. Drpt. A()r.. Bur. Plant 

 Iti(Iu.'<. Bui. '.hi, pp. .]('). pis. s, /if/. /). — An account is given of experiments for the 

 control of- the bitter rot of api)Ies, whicli is due to the fungus formerly known as 

 Glcco.iixjriuiii fructinciiuiti. but which has received the name GlomercUa rufo- 

 maculaii.'<. A detailed account of the disease and the fungus has been given in 

 a previous iiublication (E. S. U.. 1.1, ji. 270). 



In the present bulletin the author briefly describes the fungus, and the rela- 

 tion of bitter-rot cankers on the branches of trees to infection, which was pre- 

 viously noted (E. S. K., 14, pp. ;;()7, r»81 ; 15, p. 270), is discussed at some length. 

 A discussion is given of the effect of moisture and temperature on the disease, 

 and the relative susceptibility of diffei'ent varieties is conunented upon. 



The investigations which are reported were carried on in Nelson Count.v, Va., 

 in a region famous for the production of Yellow Newtown or Albemarle Pippin 

 apples. The "object of the experinunit was to determine to what extent liitter 

 rot can be controlled by spraying with P>ordeaux mixture, the number of appli- 

 cations required, and the proi)er time t') mak(> the applications. The season of 

 190.") was so favorable to the develoijuient of bitter rot and the disease api)eared 

 .so early and continued with such abundance throughout the season that the 

 results obtained are believed to be a safe guide for almost any season. 



It was found that bitter rot can be ahnost completely controlled Ity proper 

 .'i|)plications of Pordeaux mixture, 93 to OS per cent of sound fruit having been 

 saved b.v such treatment, while the fruit of the trees not sprayed rotted com- 

 I>letely. Four apiilications made at llie jiroper time ai'(> believed to be sufficient 

 to control the disease, and these should be made at intervals of 2 weeks, begin- 

 ning about (■> weeks after the trees bloom. Thorough applications of Rordeaux 

 mixture are necessary, so that the fruit may be well coated with the fungicide. 



Other diseases, such as scab, leaf sj)ot, and sooty blotch may be controlled in 



