78 



STATE HORTICULTURAL SOCIETY. 



borer continues for more than two years. This length of time enables the 

 round-headed borers to go much deeper and further, and although they 

 are not so common as the flat-headed borers, their work is to be dreaded 

 as much or more. The same remedies and methods of treatment are to 

 be used as recommended for the flat-headed borer. 



There are several other borers on the apple tree besides those already 

 mentioned, but they are not usually common and their work is confined 

 almost entirely to dead or partially decayed wood. If what has already 

 been said about dead limbs and brush in an orchard will be heeded, there 

 is CO danger of serious loss from their work. 



FLAT-HEADED CHERRY TREE BORER. 



Closely related to the flat-headed apple tree borer i& 

 another large species that works on cherry trees and occa- 

 sionally on peach trees. The larva bores under the bark on 

 the sap wood and can be readily told by the large flat head. 

 The remedies are the same as recommended for the flat- 

 Flat HEADED headed apple tree borer. 



Cheeby Tree 

 BOBEB {Dicerca 

 divaricatn). PEACH TREE BORER. 



The common peach tree borer, Sannina exUiosa, is seldom seen in the 

 imago stage, and should it be seen it might very easily be taken for a 

 wasp, as it has such a wasp-like appearance. In the grub stage it is too 

 well known to need much description, and can readily be told by having 

 sixteen legs. Unlike most destructive insects that we have, this ong is of 

 American origin and is unknown beyond our shores. 



The moths appear through July and 

 August, and, after mating, the female 

 lays her eggs singly over the trunk of 

 the tree, usually near the ground 

 When the eggs hatch, the larvjB ma} 

 attack the body of the tree well up 

 from the ground or even in the 

 crotches of the limbs, though usually 

 they work downward to a little below 

 the soil or even to the large roots. 

 The borers develop in one year, though very irregularly. The full grown 

 larvfe measure over half an inch in length. Fortunately the peach tree 

 exudes a copious supply of gum when injured and a borer can be easily 

 located and killed, ^i?- ., f^^ 



It probably is needless for me to dictate to a practical peach-grower, 

 who has fought the borer for years, what to do, yet it does seem that a 

 prevention of some kind would be more practical and less injurious to 

 the trees than cutting or wiring the borers out after they have spent 

 from two to eight months in boring the life out of a thrifty tree. The 

 boring, cutting, and bruising of a tree must hurt it more or less each 

 season, and many a tree loses its life by combined boring and probing. 

 If the soft soap and carbolic acid mixture could be used about the first 

 week in July, and then a month later, would it not be much better, and 

 keep the tree entirely free from borers? Another means of prevention 

 that I should like to see thoroughly tried in Michigan is to whitewash 

 the trunks of the trees down to the roots with lime containing Paris green 



Moths of the Peaoh Teee Boeeb (Sannina 

 exitiosa). 1, female; 2, male. 



