33] Palmen. Citrus-Arten. Coffea 139 



359. Lee, H. A. The r e 1 a t i o n o f s t o c k s t o m o 1 1 1 e d 1 e a f o f 

 Citrus trees. (Philippine Journ. Sei. XVIII, 1921, p. 85—93, pl. 1—3.) — Als 

 wichtigstes Ergebnis der vom Verf. durchgeführten Untersuchungen sei hier nur 

 mitgeteilt, daß die als „mottled leaf" bekannte, besonders in Nordamerika und 

 auf den Philippinen häufig auftretende Krankheit, sehr verschiedene Ursachen 

 haben kann. „It would seem possible that the Symptoms of mottled leaf accom- 

 pany several different types of malnutrition and are not necessarly the result 

 of excess or lack of any one substance in the soil." 



360. Lee, H. A. Citrus canker control: a progress report 

 of experiments. (Philippine Journ. of Sei. XIX, Nr. 2, 1921, p. 129—171, 

 2 pl.) — Aus der Zusammenfassung sollen hier nur die zwei wichtigsten Ab- 

 schnitte wörtlich zitiert werden: The development of the experiments has shown 

 that in addition to preventive sprays the foUowing factors contributed very lar- 

 gely to minimizing canker infection: Removal of sources of infection by pruning 

 and drastic „clean-up" sprays; Stimulation of foliage growth to occur at periods 

 of the year unfavorable to canker dissemination or development; the control of 

 violent winds by windbreaks and orchard Situation; and the control of chewing 

 insects. — The preventive sprays used with any degree of success were Bordeaux 

 mixtures and Burgundy mixtures of various concentrations. Lime sulphur, for- 

 malin and ammoniacal copper carbonate Solutions were unsuccessful under Phi- 

 lippine rainy season conditions. Copper sprays were not wholly successful, 

 although they effected tangible reductions in canker infections. 



361. McLean, F. F. A study of the structure of the sto- 

 mata of two species of Citrus in relation to Citrus -canker. 

 (Bull. Torr. Bot. Club XLVIII, 1921, p. 101—106, 1 Textfig.) — Betrifft Pseu- 

 domonas citri Hasse auf Citrus nobilis und C. grandis. 



362. McLean, E. T. and Lee, H. A. The r e s i s t a n c e t o Citrus 

 canker of Citrus nojjilis and a Suggestion a s t o the p r o d u c - 

 tion of resistant varieties in other Citrus species. (Phyto- 

 pathology XI, 1921, p. 109—114, 1 Fig.) 



363. Reinking, O. A. Citrus diseases of the Philippines, 

 Southern China, Indo-China and Siam. (Philippine Agr. IX, 

 1921, p. 121—179, pl. 1—14.) 



364. Wüistoii, J. R. T e a r - s t a i n o f Citrus f r u i t s. (U. S. Dept. 

 Agricult. Bull., Nr. 924, 1921, p. 1—12, pl. 1—2.) 



4. Coffea 



365. McClelland, T. B. The c o f f e e - 1 e a f - s p o t in Porto Rico. 

 (Porto Rico Agrie. Exp. Stat. Bull. XXVIII, 1921, 12 pp., 4 pl.) — Betrifft 

 Stilbella flavida. 



-366. Stahel, G. De Sclerotium - zi ekte van de Liberia koffie 

 in Suriname veroorzaakt door Sclerotium coffeicolum n o v. s p e c. 

 (Dept. Landb. Suriname Bull., Nr. 42, 1921, p. 1—34, 11 Taf.) N. A. 



Die neue Art steht Sclerotium Rolfsii nahe und gehört ohne Zweifel zu 

 einem Basidiomyzeten. 



367. Welles, C. G. Cercospora leaf spot of Coffee. (Philippine 

 Journ. Sei. XIX, 1921, p. 741—745, 1 pl.) — Cercospora coffeicola auf Coffea 

 bukobensis. 



