750 EXPERIMENT STATION RECOBD. 



twigs, avocado twigs, tomato, and eggplant appears to indicate that these are 

 identical with that causing the decay of lemon fruits described. 



In a study of means for prevention of loss, disinfecting the fruits by the use 

 of a wash water containing 0.02 per cent copper sulphate gave satisfactory re- 

 sults. Where this method is used, it is suggested that the wash water should 

 be neutralized by the use of sulphuric acid before the copper sulphate is added to 

 prevent the breaking down of the copper sulphate. Other important measures in 

 conti'olling injury from this disease can be employed in the packing house, and 

 the autlior recommonds disinfection of storage boxes, frequent insi>ection, and 

 the isDlation of fruit tliat may have become infected by contact. 



Die-back of lime trees in Montserrat (Ar/r. News [Barbatlosl, IJ^ (1915), 

 No. 350, pp. 318, 319). — Two fungi are said to be early and constantly present 

 on diseased twigs of lime trees. One of these resembles the withertip fungus of 

 citrus trees, Collclotrkhum glaosporioidcs, as described by American writers, 

 but the effects on leaves and fruits do not correspond so closely. 



A Dlplodia found on diseased l)ranches is tliought to be the same as that noted 

 on cacao. 



A disease of garden Arabis, R. Latl-bert (Gartenflora, 63 (1914), No. i.}, pp. 

 SOS, SO-i; aha. in Mjnol. Ccnthl., 5 (1915). No. 6, p. 295).— A disease of Arabis 

 due to djstopns caniUdus is reported at Berlin, this being supposedly its first 

 appearance in Germany. 



Rose mildew, Kikse (Roam Ztg., 29 (1914). P- i4>' "''•*• i^^ Mycol. Ccntbl., 5 

 (191.5), No. 6, p. 298). — Measures reconunended as prote<'tive against rose mil- 

 dew (SplKrrothrca ptninosa) nre the seltM-tion of nonsusccjitilile varieties, avoid- 

 ance of light sandy soil.s, and dusting several times during tlie early stages of 

 growtli with flowers of sulphur. 



Control of rose mildew (/Jxchr. Oh.^t n. Gartenhau, 40 (1914), ^'O- 7, pp. 105, 

 106, figs. 3; ali.<<. in Mycol. CoilhL, 5 (1915), No. 6. p. 2.''7).— P.rief discussion is 

 given of machines for the employment of powdered sulphur for the cttntrol of 

 rose mildew (Sphfrroihrca pannosn), witli suggestions for the adaptation of the 

 treatment to woaflu>r conditions. 



Violet smut (Urocystis violae). G. Mth.i.EK (Pralct. Ratgeber Ob.H u. Garten- 

 ban, 29 (1914), No. 7, p. 69. fig. 1 ; ah.t. in Myvol. Ccntbl, 5 (1915), No. 6. p. 296).— 

 In order to prevent the transmission of vioU't .snuit ( r. riola-), which, it is said, 

 may take place by means of cuttings, the use of seed only for propagation is 

 recommended. 



Recent observations on the blister rust of the Weymouth pine. C. von 

 TrnETF (Natiinr. Ztfichr. For.tt v. Lamltc, 12 (1914), ^'"- 9-10, pp. 4S.'f-491). — 

 Tlie author follows up a previous report (E. S. R.. 31, p. 50) with the statement 

 that in 1914 Pcridcrmium slrobi developed abundantly in spite of severe attacks 

 thereon by TubcrcvUna 7))a.rinia. Study of this relation was carried forward by 

 Lechmere, whose reiiort ai)pears below. 



A continuation of a previous study (E. S. R.. 31, p. 4.">1) on the Ril)es genera- 

 tion of tliis fungiis has shown tliat infection occurs very sjtnringly, if at all, on 

 tlie upper leaf surfaces, which boar no stomata, or on thp petioles. Infection of 

 the lower leaf surfaces by the a>ci<liospores was not prevented by the applica- 

 tion of I?onI(>aux mixture to the upper surfaces. 



Discussion is given of collected observations regarding the host plants, over- 

 wintering, dispersal, and develojunental conditions of this fungus. 



Tuberculina maxima, a parasite on the blister rust fung'us of the Wey- 

 mouth pine, E. LEruMEKE (Natiirir. Ztschr. Forsf u. TauuIic. 12 (1914), No. 

 9-10. pp. 491-498, figs. 2). — An account is given of ;i biological study of T. 

 niaxiiiKi. It is staled that only negative results were obtained from the study, 



