8o The: Colorado Experiment Station. 
often pay. See Del Norte and Carbondale notes on close planting. 1 .. *»; 
Other Points that may be cited are the promise of the Ru^et 4 s a r 
secondary early, borne out on the other plots: that Pearls first y^ar Gree¬ 
ley from Montrose sage brush lands did as well as any Pearls the first 
year from dry land. This seed we have tried out for three years with the 
same result. 
Changes of Pearl Seed.—All lots taken to the Divide, to Pagosa, to 
the plains, to the foothills, to Stove Prairie, when returned have this 
season done better than local seed. There is no exception save the one 
w r here run-out Greeley Pearls went to Montrose and returned. We find 
elsewhere that the tendency to run out may be held in check so far as 
yield is concerned, by changes, but will return at once, or after a season, 
with ruinous results when the seed is brought back to the old conditions, 
as often occurs with irrigated sod seed, at Greeley. 
Stove Prairie seed continues to give good type and good yield per 
plant but very poor stands. We have shown that it paid this season to 
plant this seed thick in the row. Many tubers of seed size make up a 
good yield, although they appear small. We brought down in November 
19 09 several lots of Stove Prairie Pearls and had them carefully stored 
at Greeley. The stands were improved by this careful storage only five or 
ten per cent. During the winter of 1910 and 1911 we are securing Stove 
Prairie seed of different history to be tried in soils on hand from Fort 
Collins, Greeley, Del Norte, and Stove Prairie. Professor Sackett, our 
pathologist, has twice visited Stove Prairie with us to try to find some clue 
as to the cause of this rot. We regard this as one of the most important 
and most puzzling problems we have on hand. 
SPRAYING FOR GRASSHOPPERS AND FLEA BEETLES 
Bordeaux Mixture* applied with a twelve nozzle four row sprayer 
which covered the whole plant was used by Mr. Atkinson five times on the 
whole plot of four acres, and on the Atkinson, Badger and Emerson farms, 
to test the great value of Bordeaux as a repellant to grasshoppers and 
flea beetles, as reported in Vermont and on Long Island. See Potato 
Insects herein. 
* Potato growers will find our arrangements at the Greeley plots for 
preparing Bordeaux mixture very convenient. A platform is required 
some six inches higher than the top of the strainer used on top of the 
spraying machine, and the water supply should discharge quickly into 
barrels standing on this platform. Four barrels are required: Two 
called dilution barrels, with hose attached to empty them into the 100 
gallon tank of the spraying machine; while two barrels are used for 
stock mixtures. In one, 50 pounds of blue stone or copper sulphate sus¬ 
pended in a sack is dissolved in water and made up to fifty gallons. In 
another lime is water slaked in like proportions, one pound to the gal¬ 
lon. A box strainer with a bottom of common wire netting is then set 
over the dilution barrels, and into one with a gallon dipper made of 
galvanized iron, five gallons of the stock copper sulphate solution is 
poured out and made up with water to fifty gallons. Into the other 
barrel, after stirring well the stock solution of lime, five gallons contain¬ 
ing five pounds of lime are strained and made up to fifty gallons. At 
this point equal quantities of each solution are put into a wide mouthed 
bottle and after being mixed by shaking, the mixture is tested with a 
drop of potassium ferrocyanide solution made from ten cents’ worth of 
the drug. If a brown color results, the mixture will burn the leaves, and 
more lime from the stock barrel must be added to the dilution barrel 
until the test no longer shows brown. Then the two dilution barrels are 
emptied simultaneously into the sDrayer strainer, the hose being regu¬ 
lated as to height so that the barrels empty evenly. Common blue stone 
costing about seven cents per pound in barrel lots, and the best of stone 
lime are used. Freshly slaked lime or that carefully covered with water 
and otherwise kept from the air is required. In some places lime con¬ 
tains magnesium impurities which are of no use in Bordeaux mixture. 
