410 STATE BOARD OF AGRICULTURE. 



results this year can not be accounted for unless it be "due to the un- 

 usual amount of rainfall. Next year we expect to repeat this test. 



ARSENATE Ol^ LEAD AS AN' INSECTICIDE. 



In the orchard of Mr. C. J. Monroe, the common arsenites used in 

 the spraying were tested to get comparative results. On one row of 

 apples arsenate of lead at the rate of three pounds in 50 gallons of 

 Bordeaux mixture was sprayed three times; viz.: 1st, immediately 

 after the blossoms dropped; 2nd, ten days later, and 3rd, during the 

 first week of August. On another row, Paris green was used at the 

 times mentioned above. White arsenic prepared according to the Taft 

 formula (boil 4 lbs. of arsenic and 8 lbs. of lime in 8 gals, of water one 

 hour. Use for 600 gallons of spray.) On another row, arsenate of lead 

 was sprayed twice, the first time being immediately after the blossoms 

 dropped and the last during the last week of August. 



After counting the fruit and sorting out the wormy ones we got the 

 following results: arsenate of lead, sprayed three times, 24 per cent 

 wormy; Paris green, three times, 34 per cent wormy; white arsenic, 

 three times, 80 per cent wormy, and arsenate of lead twice, 74 per 

 cent wormy. Mr. Monroe states that the spraying had to be hurried 

 and that the trees were not given nearly as thorough a spraying as 

 he would have liked to give them. 



In our regular spraying at the station we used arsenate of lead in 

 comparison with Paris green on the trees in the southeast block. A 

 count and investigation of the results gave us the following: Arsenate 

 of lead, 2 per cent wormy and Paris green, 5I/2 per cent wormy. 



Both of the above tests show the superiority of the arsenate of lead 

 over the other arsenites. Other things in favor oi it are that it never 

 burns the foliage and sticks on well. An objection to it is its expense, 

 but the high price that good fruit always brings warrants the fruit 

 growers in using it. 



For our regular spraying we used Bordeaux mixture in the following 

 strengths: First, before the blossoms opened, four pounds of copper 

 sulphate to five pounds of lime in fifty gallons of water; second spray- 

 ing when the fruit has set, three pounds copper sulphate and four 

 pounds of lime; third spraying, ten days later, same as second; fourth 

 spraying, during the first week in August, two pounds of copper sulphate 

 and three pounds of lime. The result was entirely satisfactory, especially 

 when two to three pounds of arsenate oO lead was added for each fifty 

 gallons. 



