62 EXPERIMENT STATION RECORD. 



that for the l)est development of tlie powdery mildew cool weather and a low degree 

 of moisture are necessary, while for the downy mildew a higher temperature and 

 greater amount of moisture are required. 



Lily fungi, M. C. Cooke {Jour. Roy. Hort. Soc. [London'], 26 {1901), No. 2-3, 

 pp. CA'A'TT//-C'A'"A'A'). — A brief review is given of some of the more important 

 j^arasitic fungi which attack cultivated lilies. Among those described are Botrytis 

 elliptica; B. cane.'icens; Rliizopus necmhs; ^Ecidlum eonrallarLr, which ordinarily occurs 

 on lilies of the valley and lias also been reported on Lilium canadense and on INIarta- 

 gon lilies; Uromi/ces lilii; Phyllostic-ta, etc. The only fungus which is thought of par- 

 ticular injury to lily cultivation in England is the Botrytis, and most of the so-called 

 "lily disease" is due to this organism. 



Ins-leaf blotch, M. C. Cooke [Jour. Roy. Hort. Soc. [London], 26 [1901), No. 

 2-3, pp. 450, 451). — A brief account is given of the occurrence of Ifetcrosporium 

 gracUe on the foliage of Iris germanmi. The leaves become spotted with elliptical 

 oblong reddish sjiots which enlarge and finally become confluent and the whole sur- 

 face of the leaf becomes brown and dead. This disease has caused considerable 

 injury in some parts of England, and the author recommends thorough spraying 

 with anuiioniacal cojjper carbonate for its prevention. 



A snowdrop disease, G. Masses {Jour. Roy. Hort. Soc. [IjOndon], 26 {1901), No. 

 1, pp. 41-46, Jiy. 1). — A description is given of a disease which is caused by attacks 

 of Botryth clnerea on the snowdrop. The young leaves and flowers are attacked by 

 the fungus just below the surface of the soil, and by the time they emerge above 

 ground they are much distorted and covered with a dense brownish mold. This 

 attack often occurs when the ground is covered with snow, and the leaves and flow- 

 ers soon fall to the ground and the bulb, in many instances, is reduced to a soft pulp. 

 The relationship of this disease with other diseases is indicated, and as jjractical 

 measures for the prevention of the disease the author recommends the removal of 

 soil overlaying the plants during the winter and applii-ation of fresh uninfected soil. 

 It will also be found advantageous to mix lime with the newly added soil wherever 

 tliis is practicable. 



A review of the literature relating- to plant protection during 1900, M. 

 HoLLRUNG {Jaltresbericld uber die Neuerungcn und Leintunyen anf dent Gebiete den Pjkmz- 

 easchntzes. Berlin, 1902, pp. 291). — After reviewing the organization and means 

 taken for combating plant diseases in different countries, the author reviews the lit- 

 erature of fungus diseases and insect enemies of plants, the subjects being arranged 

 according to the host i)lant. A review is also given of the natural and artificial 

 means adopted for combating these pests, and an annotated list is given of papers 

 relating to the subject which api:)eared during 1900, many of the articles being 

 abstracted in the report. 



ENTOMOLOGY. 



Miscellaneous notes on injurious insects, II, V. H. Lowe {Nev York State 

 Sta. Bid. 212, pp. 25, pis. 9).— Notes are given on the life history, habits, and means 

 of combating the periodical cicada (pp. 3-16) . A large brood of the periodical cicada 

 is expected in various parts of New York during the spring, and the species is there- 

 fore described in its various stages for the purpose of making fruit growers familiar 

 with the insect. The methods of controlling the insect are not well developed. As 

 a rule nothing can ])e done in tlie way of a direct remedy against its injuries. Small 

 trees, shrubs, and vines may be protected by covering them with wire netting or 

 other similar material. 



The palmer worm (pp. 16-22), which caused quite widespread destruction in apple 

 orchards in 1900, is reported to have nearly disappeared. A few were found in sev- 

 eral orchards a:id in rare instances trees were found quite badly infested. The insect 

 is described in its various stages and an account of its feeding habits is added from 



