468 



STATE BOARD OF AGRICULTURE. 



EXPERIMENT AT SAUGATUCK. 



The first test of this material was begun in the fall of 1920 at Saugatuek on 

 the farm of Mr. James Boyce. The trees were six years old and grew in very 

 sandy soil. The variety was Banner. The borer larvae had not been dug 

 from the trees that season. 



Application. The para-dichlorobenzene was applied to the trees on Sep- 

 tember 8, 1920, at the rate of ^ to 1 ounce per tree. The amount was varied 

 according to the size of the tree. Fourteen rows of thirteen trees each were 

 included in the experiment and three of these rows were left untreated as 

 checks. The treated and check rows were distributed as follows: 



Row 1 to 5. Treated. 

 Row 6. Check. 

 Rows 7 to 9. Treated. 

 Rows 10 to 11. Check. 

 Rows 12 to 14. Treated. 



Results. Certain rows of treated and untreated trees were examined on 

 October 28, 1920, and others on June 7, 1921. The results are given table 16. 



TABLE 16. PEACH BORER CONTROL AT SAUGATUCK, 1920-21. 



Plot 



Treated . 

 Check.. 



Treated . 

 Check.. 



Treated — total. 

 Check — total. . 



Number 

 trees 

 examined 



77 

 23 



26 

 13 



103 

 36 



When examined 



Oct., 1920 

 Oct., 1920 



June, 1921 

 June, 1921 



Borers 

 alive 



2 

 30 



1 



25 



3 

 55 



Average 

 per 

 tree 



.025 

 1.3 



.038 

 1.9 



.029 

 1.52 



Percentage of control — 98.2 per cent. 



EXPERIMENT AT SOUTH HAVEN. 



Another similar experiment was begun at South Haven in 1921 on the farm 

 of Mr. C. C. Chesebro. The trees were fourteen years old and of Kalamazoo, 

 Gold Drop and Salway varieties. The para-dichlorobenzene was applied on 

 September 1 at the rate of 1 ounce per tree and in the way described above. 

 The trees were examined on October 12 and with the results given in table 17. 



TABLE 17. PEACH BORER CONTROL AT SOUTH HAVEN^ 1921. 



Percentage of control — 90 per cent. 



