DISKASKS OF I'LANTS. 549 



(opiier acetate, azurin, AntiiieroiiosiMH-ina. Anliperoiiospora, Sehloosing's lior- 

 ileaux mixture. Carat, ami Keliorit as miniiared with liordoaiix uiixtiiro for the 

 i-oiitrol of the downy and powdery mildew of tlie j^nipe. 



TLe author sprayed an equal iiuniber of vines with each of the mixtures and 

 later carefully examined each of the stocks and determined the number of 

 infected leaves on the treated plants. One hundred and fifty stocks which had 

 been si)rayeil with Hordeaux mixture showed only 3!J leaves containing downy 

 mildew. None of the other preparations showed as favorable results, and the 

 author concludes that wlien the cost of the material is considered as well as 

 its elliciency, none of them ar(> in any way to be considered superior to Bor- 

 deaux mixture as usually recommended. 



Effect of some fungicides on the control of downy mildew, R. AIeissneb 

 {Wciubau u. Wcinhundcl, 2G {1!)0S), Xo. .}J, pp. 387, 388).— In 1007 experi- 

 ments were carried on with a number of proprietary fungicides for the control 

 of the downy and powdery mildew of grapes, comparisons being made with 

 Hordeaux mixture and soda Bordeaux. The results obtained showed that for 

 jiractical jiurposes 1 to 2 per cent of Bordeaux mixture is the most efficient 

 means for controlling downy mildew and sulphur for combating powdery mil- 

 dew of the grape. 



Two diseases of prickly pears, II. Tkyon {Queensland A(jr. Jour., 21 {1!>08), 

 \o. 3, lu). l.'f3-lJi7). — Descriptions are given of 2 diseases to which the prickly 

 jiear is said to be subject in Australia. The first is apparently due to some 

 physiological disturbance, and while it appears at times to destroy parts of 

 the plant and hold its spread in check, it does not seem to be of any great 

 economic importance. 



The second of these diseases, to which the name sleeping sickness has been 

 given, is apparently due to a fungus attacking the roots of the plant, but the 

 fungus has not as yet been fully identified. As far as observed, the disease 

 siireads very slowly, and as it is a root disease there is apparently not much 

 prospect of artificially communicating it. 



The fir disease in Jura, E. Hknry (Bui. Soc. ScL Nanei/, 3. ser., 8 (1907), 

 \o, 3, pp. 3()l^n8, fig. J). — Attention is called to the disease of firs attributed to 

 the fungus J'lioiiia abictina or Fusicoccuin abietiuum. which has been previously 

 r«'|»orted by the author ( E. S. K., 1!). i). C>'u). In that publication the author 

 expressed doulit as to the fungus proving a serious menace to the forests, but 

 otiier investigators having claimed that it would prove very destructive, he has 

 investigated the subject anew, and from his personal investigations and testi- 

 mony received from different regions he concludes that while the fungus is the 

 <"iuse of a disease resulting in the reddening of the foliage of the fir trees, the 

 (liseiis(! is of relatively little importance and apparently never causes the death 

 of the tree. 



A note on Micropera abietis, G. Fron (Bui. Trintcst. /S'oc. Mj/col. France, 

 ■i'l ( inos). Vo. .;, p/i. Iiiu 17 1. //.'/. /). — a descrii>tion is given of .1/. abietis, a fun- 

 gus occurring on fir trees that has not hitherto been reportetl from France 

 The author points out some departures from the typical form characterized by 

 Itostrup. 



Extent and importance of the white pine blight, S. T. Dana ( U. S. Dept. 

 .!///•., Forest Srrr. \ I'ainphlrt \, l!)()S, Man ,?6', /*/'• '/• "'"/' D- — In the early 

 sinnmer of l!Ht7 inquiries were rec«'ived from various [tarts of New England 

 rcganling a peculiar blight of the white i>ine in that section. 



Trees affected by the blight are readily rec(»gnized from the characteristic 

 reddish-iirown color jissunied by the newest needles. The til) of the needle is 

 ."hvays afl'eeled first, and the extent of the discoloration varies greatly in dif- 

 ferent niH'dles and in difl'erent trees. Attacked trees look as though they had 



