1918.1 HORTICULTTTEE. 541 



The author used dust with very satisfactory results on sweet and sour cher- 

 ries as a means of preventing rot during the picking season. The dust applied 

 was composed solely of sulphur and ground talc without any poison. The 

 fruit and foliage of these orchards had been kept covered by lime-sulphur and 

 arsenate of lead during the earlier part of the season. 



Dusting successfully controlled powdery mildew on red varieties of grapes 

 without burning the foliage. 



See also a previous note (E. S. R., 37, p. 832). 



Applying sprays for best results, G. E. Sanders {Canad. Hart., Jfl (1918). 

 No. 2, pp. 23, 24, fl(J- 1)- — An extract from an address on this .subject delivered 

 at the annual convention of the Nova Scotia Fruit Growers' Association, and 

 based upon experimental work conducted in Nova Scotia imder the direction 

 of the author in 1916 and 1917. 



Helpful hints on dusting peaches, W. W. Chase (Ga. Bd. Ent. Circ. 24 

 0918), pp. 7). — This circular contains directions for the use of dusting ma- 

 chines in applying dust mixtures for the control of brown rot, peach scab, and, 

 to some extent, curculio. 



The why of the "June drop" of fruit, A. J. Heintcke {Cornell Countryman, 

 15 (1918), No. 5, pp. 267, 268, 292, 294. 296, figs. 3).—\ popular discussion of the 

 factors influencing the set of fruit, with special reference to apples. 



California's grape industry, C. J. Wetmoee et al. (Cal. Bd. Vit. Comrs. Bid. 

 10 (1918), pp. 30). — A statistical review of the California grape industry for 

 the season of 1917, including data on present viticultural activities and sug- 

 gestions dealing -v^ith the preservation and future development of the grape 

 industry. 



Where and how to grow avocados, W. Popenoe and E. Simmonds (Fla. 

 Grower, 17 (1918), No. 7, pp. 7-10, 16, 17, 23-26, figs. 8).— This article contains 

 detailed instructions for growing avocados in southern California and southern 

 Florida, together with a descriptive list of varieties. 



The native bananas of the Hawaiian Islands, V. MacCaxjghey (Plant 

 World, 21 (1918), No. 1, pp. 1-12). — This paper briefly considers some of the 

 introduced bananas and discusses somewhat in detail the native varieties. 



Better California g'rapefruit, A. D. Shamel (Cal. Citrogr., 3 (1918), No. 5, 

 pp. 94, 115, 116, figs. 4)- — A progress report on work conducted during 1917 

 in the improvement of grapefruit by top-working inferior or worthless trees 

 with buds from superior trees. The present work is based upon methods used 

 in bud-selection experiments in California citrus groves (E. S. R., 37, p. 144). 



Relation of soil moisture to orange growth, C. A. Jensen (Cal. Citrogr., S 

 (1918), No. 5, pp. 98, 113, fig. 1). — This paper presents some of the results of 

 soil-moisture experiments wdth oranges conducted at Riverside and Meri'yman, 

 Cal., and at Phoenix, Ariz., during the past summer. 



The data here presented indicate that there is a close correlation between 

 the growth of orange trees and the amount of available soil moisture present 

 from week to week, an increase in soil moisture producing an almost immediate 

 increase in orange growth. The orange is likewise sensitive to humidity in 

 the air, and in the presence of a relatively high humidity will make consider- 

 able growth even when the percentage of available soil moisture is low. 



The orange trees obtained no appreciable amount of moisture from soil below 

 4 ft., thus indicating that it is a waste of water to apply more than is neces- 

 sary to keep the deeper subsoil up to its moisture-holding capacity. The 

 movement of the soil moisture upward from the deeper subsoil is entirely too 

 slow to supply the roots in the main feeding-soil area with enough moisture to 

 satisfy the normal needs of the tree after the first 8 ft. of soil has been 



