234 PATHOLOGY [Bot. Absts. 



of water or copper soda (6:8: 40) is effective. Bordeaux mixture (6:4: 40) does not give as 

 good results and lime-sulfur solution (1 : 9) was not a success. Copper soda is recom- 

 mended. — "By spraying the trees just before or when the earliest buds are showing pink, 

 leaf curl can be cured." — Black spot of apple (Venturia inaequalis) was controlled by the 

 use of lime-sulfur solution. Of the 6 varieties included in the trials 5 were sprayed twice, 

 both applications being made before the trees were in full bloom. Illustrations show that 

 first application (1 : 15) was made before the blossom clusters had separated, the second (1 : 35) 

 when many of the blossoms had opened. Satisfactory results were secured. — D. Reddick. 



1642. Lewis, C. O. Premature deterioration of fruit. Better Fruit U^.d-L 1919 — 

 This is a popular address delivered before the Oregon State Horticultural Society, Roseburg, 

 Dec. 7, 1918.— Burning, overmaturity, cracking, "drought spot," Jonathan spot, bitter pit, 

 cork, fruit pit, dry rot and water core are cited as cases of premature deterioration of fruit. 

 Lack of moisture in the soil during time of maturity of fruit or irrational irrigation, together 

 with disturbances in nutrition, are given as possible causes of most of premature deterioration 

 of fruit. — A. E. Murneek. 



1643. LiiSTNER, G. Uber die seither in Osterreich und Deutschland mit Perozid ange- 

 stellten Peronospora-Bekampfungsversuche und ihre Ergebnisse. [Summary of the use of 

 perocid in Germany and Austria for the control of grape downy mildew.] Mitt. Weinb. u. 

 Kellerw. 1917: nos. 9 to 12; 1918: nos. 1 to 2. — Perocide and "Rohperozid" are not so good as 

 Bordeaux mixture but in average years, give satisfactory control of downy mildew. The 

 substances are easy to apply, they spread well and have good adhesion. Injury from their 

 use is now practically negligible. [Through abst. by O. K. (irchner) in Zeitschr. Pflanzenkr. 

 29:61. 1919.]— D. Reddick. 



1644. Macotjn, W. T. Blight resistant potatoes. Canadian Hortic. 42:129-156. 1919. 

 — Eight hundred varieties of potatoes have been grown at the Central Experimental Farm, 

 Ottawa, Canada, during the past thirty years. Fifty-three varieties were eventually selected 

 as apparently most resistant to late blight, and of these the following ten varieties were 

 outstanding in resistance: King Edward, Dalmeny Beauty, Factor, Hard to Beat, Highlander, 

 Duchess of Cornwall, White Giant, Dr. Maerker, Sirdar, Holborn Abundance. Of these all 

 but the White Giant originated in Europe, where special attention has been paid to blight 

 resistance. — E. F. Palmer. 



1645. Marchal, P., and G. Arnatjd. Rapport phytopathologique pour les annees 1916 et 

 1917. [Phytopathological report for the years 1916 and 1917.] Ann. Serv. Epiph. 5: 1-35. 

 1918. — A long list, with short notes, of the insects and diseases affecting plants in France in 

 1916 and 1917. — Regulatory measures for the protection of plants and an account of the 

 organization effected to combat plant pests and diseases. — D. Reddick. 



1646. Miehe, Hugo. Anatomische Untersuchung der Pilzsymbiose bei Casuarina equi- 

 setifolia nebst einigen Bermerkungen iiber das mykorhizenproblem. [Anatomical investiga- 

 tion of fungous symbiosis in C. e. with remarks on the mycorhiza problem.] Flora 111-112: 

 431-449. PL 6, 2 fig. 1918. 



1647. Montemartini, Luigi. Esperienze di lotta contro la Peronospora delle patate. 

 [Experiments on the control of potato late blight.] Revist. Patol. Veg. 9: 126-130. 1919. — 

 Demonstrations of spraying for the control of Phylophlhora infestans on the potato were car- 

 ried out at four places. One or two applications were made of dilute copper sulphate solu- 

 tion, Bordeaux mixture or "pasta cafTaro" (a commercial Bordeaux paste). Increased 

 yields ranced from 30 to 100 per cent. Potatoes from the sprayed portions of the fields also 

 showed greater specific gravity, and a higher percentage ot starch and of dry matter. — F. 

 M. Blodgett. 



