
PEST CONTROL 
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SODIUM SELENATE 
SUGGESTIONS ON METHODS OF APPLYING SODIUM SELENATE 
Make a stock solution by dissolving 100 grams of sodium selenate (about 3!/, ounces) in | gallon of 
water. One pound of sodium selenate will make 4!/> gallons of stock solution. 
For most crops the suggested dosage is !/4 gram sodium selenate per square foot (equal to | pound 
to 1800 square feel Each quart of stock solution contains 25 grams and is therefore enough for 100 
square feet of bench surface. It must be diluted with additional water to get even application and 
good distribution in the soil. 
A convenient method of application is by means of the Hozon proportioner. This is screwed on the 
water faucet and the watering hose is connected to it. A small side hose dips into a pail of solution 
alongside. As water flows through the proportioner it creates a suction which draws up the solution and 
mixes it with the water in a definite ratio. In the range of 45 to 60 pounds water pressure the ratio 
is about | to 15. For treating 100 square feet of bench surface use | quart of stock solution with 
additional water to make-1!/5 gallons of solution in the pail. This will give about 25 gallons of dilute 
solution through the watering hose for the 100 square feet or about | gallon per 4 square feet. The 
material can also be applied by means of a power or barrel sprayer or liquid feed pumping system. 
Use one quart of stock solution in 25 gallons of water for each 100 square feet or | gallon per 4 
square feet, 
On chrysanthemums we recommend |/, gram sodium selenate per square foot. The safest method is to 
make two applications at the !/g gram rate a week or so apart. 
Sodium selenate is very effective for foliar nematodes, red spiders, midge, green and black aphids 
on chrysanthemums. Cornell University and Ohio State are working on the use of this material and we 
will keep you posted on any newer developments. 
CAUTION: 
Syringe off any solution which might get on the foliage. 
Do not treat plants until 2 or more weeks after transplanting. 
Be sure to apply the correct amount evenly. 
Sodium selenate is a poison and treat it as such. 
This is a new material and we recommend trying it out in a limited way before treating your entire area. 

Dilution Table for Liquid Spray Materials 
For measuring small amounts of liquids have a set of household measuring spoons, and a glass graduate 
marked in fluid ounces or a glass measuring cup marked in quarters and thirds. 
becuptul == 8 flo. 
| tblsp. = 3 teaspoontuls (tsp.) 
| pint = 16 fluid ounces (fl. oz.) 
| fl. oz. = 2 tablespoonfuls (tblsp.} 


Amount to use for the following quantities of spray 
Recommended 
Dilution 1 gallon 3 gallons 10 gallons 20 gallons 50 gallons 100 gallons 
| to 50 2'/> fl. oz. 8 fl. oz. I'/p pt. 3 pint | gal. 2 gal. 
5 thlsp. | cup 3 cups 
| to 100 1%, fl. 02. 4 fl. oz. 13 fl. oz. I'/> pint 2 qt. | gal. 
2!/p tblsp. / cup I'/ cups 3.cups 
| to 200 4 tsp. 2 fl. oz. 6l/> fl. oz. 13 fl. oz. | qt. y Aoi 
4 thlsp. 34, cup 1!/> cups 
| to 400 2 tsp. | fl. oz. 31/4 fl. 07. 6!/> fl. oz. | pint | qt. 
2 thisp. 61/5 tblsp. 34, cup 2 cups 
| to 600 1|/, tsp. 4 tsp. 2 fl. oz. 4l/> fl. oz. 11 fl. oz. 1/3 pt. 
4!/> tblsp. V/> cup 1/3 cup 24/3 cups 
| to 800 | tsp. | tblsp. 1 2/3 fl. oz. 31%, fl. oz. 8 fl. oz. | pt. 
31/3 tblsp. 6!/, tblsp. | cup 2 cups 
| to 1000 ¥, tsp. 2\/, tsp. I'/, fl. oz. 2" fl. oz. 6!/> fl. 02. 13 fl. oz. 
ms 2!/5 tblsp. 5 tblsp. 34 cup 1'/ cups 
| to 1600 V/> tsp. I'/y tsp. 3% fl. oz. 1 2/3 fl. oz. 4 fl. oz. 8 fl. oz. 
. 5 tsp. 31/3 tblsp. Vy cup | cup 
| to 2000 /3 tsp. | tsp. 2/3 fl. 07. 1'/, fl. oz. 31/4 fl. oz. 6!/, fl. oz. 
4 tsp. 2'/p tblsp. 6!/5 tblsp. 34, cup 


