341 
San Jose ScaLte Experiments, 1919 
Control 
Plot Treatment 
No. Barry Quincy 
1 |Commercial lime-sulfur solution, 1 gallon to 8 
CEMA SS UAL EEEN cit cha ovate ale & sacshece evs os Cece Good Good 
2 |Niagara soluble sulfur, 12144 pounds to 50 gallons 
VLG Ine mi tacstenataverers teeinrs) x iene hotetaleie is! « pore cote reveisSe Excellent Excellent 
3 |B. T. S., 14 pounds to 50 gallons water....... Fair | Good 
4 |Sherwin-Williams dry lime-sulfur, 15 pounds to 
BO TSO CWaAter ae baa eos clelemeimaee s a eTOn ® Excellent Excellent 
5 |Dow dry lime-sulfur, 15 pounds to 50 gallons 
VUES ae Se cen a Wet Onee e Ce eine: Gare Ace ee Gs) | Excellent 
6 |Sealecide, 1 gallon to 15 gallons water........ Excellent Excellent 
7 |Check: unsprayed 
* Material failed to arrive in time for application. 
In the above table the terms used indicate that a plot graded as 
“Fair” showed a considerable number of live scales present on all parts of 
the tree and fruit; “Good” indicates scattered living scales fairly easy to 
find, but not numerous enough to cause marked blemishes on the fruit 
or injury to the trees; and “Excellent” indicates living scales difficult to 
find and no blemishes on the fruit. 
ADDITIONAL WorK IN 1920 
In the spring of 1920 the same orchard at Quincy was again treated, 
plots 1, 2, 3, 4, and 5 being given the same application as in 1919. Plots 
6 and 7 were sprayed with Martin-Senour’s dry lime-sulfur at the rate 
of 12% pounds to 50 gallons of water. A‘check plot of three trees was 
left on the east side of the orchard, these trees having been sprayed 
in 1919 with liquid lime-sulfur, one to eight. The spray was applied on 
March 29 and 30. The days were warm and bright, with a moderately 
high wind from the northwest. The leaf buds were just beginning to 
show the green. The spraying was done with a “Friend” power outfit, 
using from 200 to 250 pounds’ pressure, the spray being applied with two 
rods, one used from the top of the tank and the other from the ground. 
All the trees were sprayed as thoroughly as possible. 
The orchard was graded on June 11 by five men, working inde- 
pendently, only one of whom knew the treatments which had been 
given. The plots were again examined and graded on Aug. 11 and Sept. 
22, to note any increase in the number of scales. Results of these grad- 
ings were compared and tabulated as in 1919. 
On Aug. 11, fifty leaves were picked at random from different 
parts of the trees in each plot, and examined for living scales. 
On Sept. 22, one hundred apples on each plot were examined for the 
presence of the scale. These results may be somewhat misleading from 
the fact that the number of scales on all of the apples where less than 20% 
