847 



downy mildew, and anthracnose of grapes {Physalofipora hid^cellii, Plas- 

 mopnro riticola, und Sphaeeloma ami)eUnu)ti), antliracnose of raspberries 

 and blackberries {Glwosporium renetum), leaf blight of strawberries 

 {Sjylxcrelln fragariw), onion smut {Urocystis cepulw), -potato rot {Phy- 

 iophthora 'mfcstans)^ and leaf blight of tomatoes [CladoKporium fuJvum). 

 Formulas are given for Bordeaux mixture, ammoniacal carbonat*' of 

 copper, and ammonia-copper solution. Spraying apparatus is described 

 and illustrated. 



Illinois Station, Bulletin No. 20, April, 1892 (pp. 24). 



Field experiments with corn, G. E. Morrow, :\r. A., and F. D. 

 Gardner, B. S. (pp. 49-71). — This article gives an account of experi- 

 ments with corn in 1891, together with a summary of similar experi- 

 ment.; i) ISS8, 1889, and 1890, which were recorded in Bulletins Nos. 4, 

 8, and l.> of the station (see Experiment Station Record, vol. i, p. 28; 

 vol. II, pp. 11 and 556). The following subjects were treated: Test of 

 varieties, time of planting, thickness of planting, planting in hills or 

 drills, depth of plowing, depth of cultivation, effect of root pruning and 

 of fertilizers, increase of dry matter with the growth of the corn plant, 

 and effect of removing tassels. There «ire also practical suggestions for 

 corn culture in Illinois. 



"The season was one of severe drouth. The rainfall had been defi- 

 cient in 1890 and in the early mouths of 1891. For the 5 months from 

 May to September it was 7.65 inches, the average for this portion of the 

 year being from 18 to 20 inches. The average mean temperature for 

 these 5 months was 68"^ F., which was not far from the average during 

 a series of years." 



Experiment Xo 1. — Corn, test of varieties (pp. 51-60). — The varic^ties 

 tested in 1891 included 22 yellow dent, 12 white dent, and 2 mixed dent. 

 The results, as in the case of the similar experiments previously reported, 

 are given in detail in tables, summaries, and general notes. 



Experiment Wo. 3. — Corn, time of planting (pp. 60-62), — In 1891 Burr 

 White, a medium-maturing variety, was planted at eight different dates 

 at intervals of a week, from April 25 to June 13. The average height 

 of the tallest stalks on each plat, measured each week from June 8 to 

 September 21, is tabulated, together with the yield of corn and per 

 cent of water in the corn. 



Experiment Wo. 5. — Corn, thickness of planting (pp. 62-65). — Tabulated 

 details are given for two experiments described as follows: 



On a tract of fall-plowed land 27 rows of corn 3 feet 8 inches apart, were planted, 

 3 rows with single kernels 3 inches apart, 3 with single kernels 6 inches apart, and 

 3 with single kernels 9 inches apart; also 3 rows with 3 kernels every 9 inches, 3 

 with 3 kernels every 18 inches, and 3 with 3 kernels every 27 inches. This was at 

 the rate of 47,520, 23,760, and 1.5,840 kernels per acre. 



The weight of 100 ears, and of 100 stalks, the number of ears, and the bushels of 

 corn per i^ore "were greatest from tUe tUiuuest plantings and least from the thickest 



