350 EXPERIMENT STATION RECORD. [Vol. 41 



by abundant precipitation, but that for a long period of rainy weather (20 days) 

 the alkaline are much more durable than are the acid sprays. 



Citrus spots and blemishes, J. IMatz {Porto Rico Dept. Agr. Sta. Circ. 16 

 {1919), pp. 8, pis. 3). — Descriptions are given of some of the more common dis- 

 eases to which citrus trees and fruits are subject, with tentative suggestions for 

 control. Directions, based on recent experiments, are given for the identifica- 

 tion and treatment of the different rots and blemishes of the trees. 



Coconut bud rot, W. Nowell {Agr. Netos [Barbados], 17 {1918), No. ^28, p. 

 302). — Some particulars are given of the type of bud rot referred to in pre- 

 vious accounts (E. S. R., 40, p. 750). The type of bud rot occurring on the 

 fruit stalks is believed to be of bacterial causation, but the characters of the 

 organism held by different workers to cause this rot are said to differ widely. 

 The symptoms and progress of the disease are briefly discussed. The treatment 

 recommended adds to the usual plan of firing the dry matter in the top of the 

 coconut tree a Bordeaux spray with 2 lbs. lead arsenate to each 50 gal. of spray 

 in order to prevent weevil damage to the scorched tissues. 



Coffee leaf disease (Hemileia vastatrix) in TJg'anda, S. Simpson {Trans. 3. 

 Internat. Cong. Trop. Agr. 1914, vol. 2, pp. 652-654). — Coffee leaf disease {H. 

 vastatrix) is stated to have been present in Uganda for many years, but no 

 record exists, so far as known, of Coffea robusta in this region being attacked 

 by any other species of Hemileia.. 



A note by W. Small states that the disease of cultivated coffee is probably 

 the same as that which occurs on the native coffee, though experiments which 

 are in progress to determine this point have given only negative results. The 

 best results as regards protection have been obtained with Bordeaux or Bur- 

 gundy mixture. 



Three sprays for coffee affected with Hemileia vastatrix and other fungus 

 diseases, W. J. Dowson {Nairobi, British East Africa: Govt., 1915, pp. 4)- — 

 An account of tests carried on for two years in order to ascertain the most 

 effective and economical spray against H. vastatrix and other fungus diseases 

 on coffee states that all fungicides were effective, the dilute not less so than the 

 ordinary sprays. Bordeaux mixture, which at the time of this report was 

 cheapest at 0.25 strength, produced a marked invigorating effect not given by 

 any other spray. The carbid mixture, though easy to prepare, was very ex- 

 pensive and gave the trees an unsightly appearance. Liver of sulphur, though 

 easiest to prepare, was expensive and hard to obtain. Burgundy mixture proved 

 to bp expensive with no corresponding advantage. 



Report on white pine blister rust control, 1918 {Amer. Plant Pest Committee 

 Bui. 2 [1919], pp. 1-16). — This report is published by the American Plant Pest 

 Committee, formerly designated as the Committee on the Suppression of the 

 Pine Blister Rust in Korth America (E. S. R., 39, p. 758). This committee is 

 composed of four members from each American State and from each of the 

 Canadian Provinces, and its purpose is to secure and disseminate information 

 and to bring to bear measures looking to the eradication or control of danger- 

 ous plant pests, in particular to attack effectually any such pest in its initial 

 stages and thus prevent its establishment. The publication gives in brief form 

 the results of the third season's experiments and investigations by the persons 

 responsible for them, as noted in some detail below. 



White pine blister rust attacks 5-leaf pines only after a period of growth on 

 Ribes, the total destruction of which is thc^ only successful method of protect- 

 ing pines. The maximum distance to which Ribes bushes must be removed 

 does not exceed one-third of a mile under the most favorable conditions for 

 infection. Ordinarily a distance of 200 yds. is probably sufficient to allow 

 commercial growth of Avhite pine. Pines of all ages are attacked, but older 



