6 



GEAPE-SPRAYING EXPERIMENTS IN MICHIGAN IN 1909. 



traction sprayer as before, with fixed nozzles for the first three spray- 

 ings and trailers manipulated by hand for the last two. Plat 5 was 

 the check and was not sprayed. The mixtures used and the treatment 

 given the plats were as follows: 



Table I. — Dates of spyuiiiiuj and fuiu/ichJcs ii.scfl on nine experinicnfal plats of 

 Concord {/rapes in }Jr. <liil<lin(js'f<: rineynril, near Latcton, Mieli., I'JO'.). 



Date of 

 spray- 

 ing. 



Fungicide used. 



Stage of growth. 



May 28 

 June 8 



30 

 July 10 



21 



May 2S 

 June 8 



30 

 July 10 



21 



May 28 



June 8 



30 



Julv 10 



21 



May 28 

 June 8 



30 

 July 10 



21 



May 29 

 June 8 



30 

 Julv 10 



21 



May 29 

 June 8 



30 

 July 10 



21 



May 29 

 June 8 



30 

 July 10 



21 



May 29 



June 8 



30 



July 10 



21 



May 29 

 June 8 



30 

 July 10 



21 



Plat 1. 



4-4-50 Bordeaux mixture 



do 



do 



do 



do 



I'l.AT 2. 



4-3-50 Bordeaux mixture. 



do 



do 



....do 



....do 



Plat 3. 



4-3-50 Bordeaux mixture, with 2 jiounds of iron sul- 

 phate. 



do 



do 



do 



....do 



Plat 4. 



4-2-50 Bordeaux inixlurt 



....do 



....do 



....do 



....do 



Plat li. 



3-2-50 B ord eau X in i X I ure . 

 ....do 



.do. 

 .do. 

 -do. 



Plat T. 



Ammoniacal solution of copper carbonate. 



do 



....do 



....do 



....do 



Plat S. 



Neutral copper acetate . 



....do 



....do 



....do 



....do 



Plat 9. 



Self-boiled lime-sulDhur. 



....do : 



....do 



....do 



Neutral copper acetate. . 



Plat 10. 



Commercial lime-sulphur. 



do 



do 



.do. 



Neutral copper acetate. 



Shoots (i to 12 inches long. 

 Nearly ready to blossom. 

 Grapes about J inch in diameter. 

 Grapes about '. inch in diameter. 

 Do. 



Shoots fi to 12 inches long. 

 Nearly ready to lilossom. 

 Grapes aliout % incli in diameter. 

 Grapes about i inch in diameter. 

 Do. 



Shoots (i to 12 inches long. 



Nearly ready to iilossom. 

 Grapes about I inch in diameter. 

 Grapes about \ inch in diameter. 

 Do. 



Shoots to 12 inches long. 

 Nearly ready to blossom. 

 Grapes about % inch in diameU^r. 

 Grapes about \ inch in diameter. 

 Do. 



Shoots fi to 12 inches lon'j. 

 Nearly ready to blossom. 

 Grapes about ^ inch in diameter, 

 Granes about '. inch m diameter. 

 Do. 



Shoots G to 12 inches long. 

 Nearly ready to blossom. 

 Grapes about % inch in diameter. 

 Grapes about '. inch in diameter. 

 Do. 



Shoots t) to 12 inches long. 

 Nearly ready to blossom. 

 Grapes about § inch in diameter. 

 Grapes about ', incli in diameter. 

 Do. 



Shoots to 12 inches long. 

 Nearly ready to blo.ssom. 

 Grapes about g inch in diameter. 

 Grajjes about '. inch in diameter. 

 Do. 



Shoots to 12 inches long. 

 Nearly ready to blossom. 

 Grapes about 3 inch in diameter, 

 (irapes aljout '. inc'.i in diaineier. 

 Do. 



[Cir. 65] 



