652 experimp:nt station UKcdHD. 



Observations on some diseases of the olive, L. Pktri (Atti R. Accad. JAiu-ci, 

 Rcnil. CI. Sri. Fix.. Mai. c Sat.. .', .srr., /,S {IHOH), //. No. 12. pp. {iS')-(>'i2, figs. 

 ,'/). — The author notes 4 different diseases of tlie olive, a new leaf si)ot il'ln/l- 

 Idsficla o/r«' n. s]).) which produces white spots on the j^rowinj; leaves, a l)ac- 

 leriosis of the fruit in which the infection is sui)p<ise(l to lie produced hy insect 

 jiunctures, an anatomical alteration of tlie twijis and brandies of tlie olive pro- 

 duced by a coccid (PoUinia poUinii), and a new parasitic fungus on the root 

 tips of the olive trees. 



The rootlets attacked hy the disease lasl-nanie<l present a brusli like aiipear- 

 ance at first, wliich soon develoi)S into a niycorrhiza that linaily produces a 

 coralloid condition of the rootlets. By the end of sunnner tliese rootlets turn 

 black and abson)tion ceases. The funsrus helonj^s under tlie IMectascinea; and 

 is described as a new jrenus and species, ('tiiptodNi-ii.s olitiospornx n. g. and sp. 

 The perithtM-ia are black and are borne on the roollcis of the diseased plants. 



The splitting of oranges in 1908, L. Savastano {llol. Arbor. Hal.. ,7 {]!)09), 

 Ao. 2. pp. 83-87, fif/s. .'>). — The usual splittinir of oranges is caused by an ex- 

 cessive absorption of water by the fruit and a consequent ruiiture of the skin 

 of the orange from internal pressure. In 190S in the Province of Sorrentino, 

 the season was very dry and hot, and the fruit for that reason did not reach its 

 usual size but ripened prematurely and showed much splitting. This splitting 

 is claimed to have been produced by the long drought in most instances, but in 

 a few cases it seemed to have originated from an abnormal carpellary prolifera- 

 tion that thrust itself outward against the surface of the orange and finally 

 split it. 



Peach leaf curl, PI Wallace (Rpt. Ninf/ara Spraprr Co. Frlloirsliip, I ( l<)0!)), 

 pp. 8, pis. 3, fly. 1). — These experiments were undertaken to ol)tain data rela- 

 tive to the efficiency of lime sulphur sjirays as compared with Bordeaux 

 mixture, and to determine what dilution can most profitably be used. The 

 experiments were carried on under the direction of the New York Cornell 

 Station under a fellowship established by the Niagara Sprayer Company, and 

 the applications were made April 5 to 12. The trees of each plat received only 

 one application of the spray. The results of spraying with lime sulphur 1 : 5>, 

 1 : 12, 1 : 15, and 1 : 20, respectively, are given, and compared with those obtained 

 by using Bordeaux 3:3: 50. 



The lime sulphur 1 : 15 controlled the leaf curl as well as the 1: 9, and even 

 1 : 20 compared favorably with the stronger solutions, and gave a lower per- 

 centage of the curl than the Bordeaux in other orchards. In the experiments 

 where lime suli)hur and Bordeaux were sprayed on the trees the same day, the 

 results were in favor of the lime sulphur. The percentage of diseased leaves 

 was reduced froin 11.3 to 5.3 by the 1: 15 lime sulphur and to 8.3 on the Bor- 

 deaux plat. It is considered as demonstrated beyond doubt that proper spray- 

 ing with either 1 : 9 or 1:15 lime sulphur effectually controls the curl and at 

 the same time acts as an insecticide, especially for the San Jose scale. 



A report on the chestnut tree blight, J. Mickleborough (Harrlshiirfj: Pcnn. 

 Depf. Forest rp. lUO'.l. pp. Id, pis. 2). — A report is given of investigations carried 

 on to ascertain the presence of the chestnut tree disease (Diaporthc parasitica) 

 in the valleys of the Delaware and Susquehanna rivers in Pennsylvania. Ac- 

 companying the report is an account of the life history, propagation, and dam- 

 age already done by this disease, and suggestions for remedial treatment. 



The author has not foimd the blight north of South Mountain in the Sus- 

 quehanna Valley. In the Delaware "^'alley diseased trees were found at a num- 

 ber of places, but nowhere has it been so destructive as in New York, especially 

 on Long Island. 



