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STATE HOUTICULTUKAL SOCIETY. 



Pettit has also done work along this hne. I will give here the results 

 gotten this fall in the Wadsworth Bros, orchard at Fennville. Para- 

 dichilorobenzene was applied on September 2 to about 250 trees and part 

 of them were examined during the first week of October. The lots of 

 trees were selected in different parts of the orchard so as to get a good 

 average as to soil, age and condition of trees, etc. 



No counts were made of the borers above ground but the trees of 

 Lot 4 are older than the others and have many dead places in the bark 

 on the trunks and it was here and around the crotches that most of the 

 borers were found. This condition was shown very clearly in the Chese- 

 bro orchard at South Haven where Mr. Johnston did some work this 

 season. In this orchard nearly all the borers were so high on the tree 

 that they were not subject to the paradichlorobenzene. 



Another point of interest was brought out in a demonstration made 

 at Manistee by Mr. Farrand. A treatment was made on several trees 

 from which heavy exudations of gum were not removed. When the 

 trees were examined later several live borers were found under the gum 

 as the gas would not penetrate through it to the borers. 



Wo cannot make very definite recommendations for the use of para- 

 dichlorobenzene now as it is still in the experimental stage, but the 

 results which we have gotten here in Michigan and others have gotten 

 in other states show that it is very valuable to the peach grower when 

 properly used. It must be rememl^ered, however, that its use must be 

 limited to trees not younger than six years old and that it will not be 

 a cure-all for it will not kill borers which are above ground very far 

 and on some trees most of them are above groimd. 



The best recommendation we can make at this time is to use it on 

 trees six years old or older and at the rate of ^^ to one ounce per tree. 

 The most effective results can be gotten by applying from September 



