1919] HORTICULTURE. * 237 



during the wiiittT of 1916-17 are reviewed, niininnnu temperatures where avail- 

 able are recorded, and an alphabetical list is given of trees, shrubs, and other 

 plants, showing the extent of damage, or escape from injury, as well as the 

 number of years the plant has been grown in its present position. 



California crop distribution and estimates 1918 (Mo. Bui. Cal. Com. Hort., 

 8 (1919), No. J,, pp. 127-225, fujs. 5S)..— This number of the bulletin deals with 

 the acreage, distribution, tonnage, and valuation of commercial fruit and vege- 

 table crops in California. 



Analyses of insecticides and fungicides (Ncio York State Stu. Bui. JfSff 

 (1918), pp. 15). — This comprises analyses of materials sold as insecticides and 

 fungicides in tlie Slate of New York. 



[Beets and peas at Wisley] (Jour. Roy. Hort. Soc, 43 {1919), No. 2-3, pp. 

 4SS-520). — Descriptions are given of varieties of beets and peas tested at 

 Wisley, 1916-1918, including selected lists of meritorious varieties. 



Cabbage culture, J. W. Rigney {New Mexico Sta. Bui. 118 {1919), pp. 25, 

 figs. 8). — A practical treatise on the culture, harvesting, and marketing of cab- 

 bage, including some data on cultural and varietal experiments conducted at the 

 station. 



General arboriculture, J. M. Pkiego {Arboriculture General. Madrid: M. G. 

 Hcrndndes Sons, 1917, pp. ¥1+393, figs. 131). — A treatise on arboriculture, with 

 special reference to Spanish conditions. Part 1 discusses the general principles 

 of arboriculture, including methods of propagation and uur.sery practices. Part 

 2 comprises a treatise on fruit growing, harvesting, and marketing. 



[Report on horticultural investigations] (Iowa Sta. Rpt. 1918, pp. 32-36). — 

 A progress report on various projects for the year. 



As a result of spraying experiments with fruit trees conducted for several 

 years the following definite recommendations as to schedule of spraying best 

 adapted to meet Iowa conditions are offered : Use lime-sulphur or Bordeaux 

 mixture combined with arsenicals before the bloonung season ; use lime-sulphur 

 with arsenicals between the blooming season and late June ; use Bordeaux mix- 

 ture with arsenical mixture after June. In orchards where there has been a 

 high percentage of wormy fruit and in seasons when the worms are unusually 

 abundant, it is advisable to spray twice for the second brood of codling moth, 

 once during the last third of July and again after two or three weeks. In 1918 

 the brown rot of plums was kept under control at the State Fruit Breeding 

 I'arm by the use of Bordeaux mixture, 4 : 4 : 50, applied the middle of July, and 

 repeating the applications two weeks before ripening season. 



The long-continued experiments in the use of hardy and disease-resistant va- 

 rieties as .stocks on which to top graft some of the less hardy commercial apples 

 thus far indicates the value of Wealthy and Virginia Crab as stocks for Jona- 

 than, and of Virginia Crab and Delicious as stocks for Grimes. It has also been * 

 found that Delicious, when top-worked on Virginia Crab, comes into bearing 

 earlier and gives a more satisfactory yield than on its own stock. 



In the soil management experiments started in 1910 in an unproductive or- 

 chard of bearing age at Council Bluffs, various systems of tillage, cover crops, and 

 management have been followed. Thus far the indications are against the 

 practice of continuous clean cultivation, although it appears that certain methods 

 of cultivation have their place in the management of a bearing orchard, as op- 

 po.sed to a continuous sod-bound condition. Under continuous clean cultivation, 

 the loss of trees from winter injury is noticeably greater than where the land is 

 kept in blue grass sod or legume crops. This injury has been greatest with Ben 

 I^avis and least with Grimes, Jonathan, and Roman Stem, in the order named. 

 Northwest Greenings, Wealthy, and Oldenburg liave escaped injury thus far. 

 132688°— 19 i 



