MONTANA KXPERIMENT STATION. 



ina 



< a' another lucalily whik- llmsc tliat are already widely distributed 

 and well known, such as the a])i)le leaf-aphis, ha\-e heen excluded. 



Not all of the s])ecies in the list can be considered to l)e ])ests of 

 lirst class importance in our climate but the\- are all S))ecies that for 

 one reason or another, usually because they icvd in the fruits that 

 are liable to be shi])ped into tlu' state or because the\- hibernate in 

 or on some part of the trees that are shipped in as nursery stock, 

 are liable to come across our borders incidentall\- in commercial 

 Ijractices. 



THE PEACH-TREE BORER. 



Though the ])each-Lrce borer shows a decided preference for peach 

 trees it is also a pest of cherry, ])lum, nectarines and a])ricots. 'I'he 

 insect is therefore of interest to the fruit -<j;-rowers of ^Montana, 

 i!ioui;h few i)eaches are growMi. It is not i)rol)al)le that it will be- 

 come a very serious eneni}- of cherries and pbuns, but it is thoug'ht 

 best to include it in the list here treated. 



The youno- lar\-a burrows beneath the bark and sa]) wood durin^^ 

 the first year of its life and passes the winter in this Ijurrow. In 

 the spring- it resumes feeding", reaching' full g'rowth in Mav or June. 

 In its hibernating condition it is liable to be transferred on nursery 

 stock- 

 It s a difficult pest to control and one that should be vig-orotisly 

 dealt with if it is found in Montana. Its presence on g-row^ing trees 

 is indicated by ^gummy extraction from the bark at the points where 

 its burrows touch the exterior. 



Fig. 2. The Peach-tree Borer: a, female; b, male; c. larva; d, e, female 

 and male pupae: f. ccxoon. (Marlatt, Circular 17, New Series, Div. of En- 

 tomology. U. S. Dept. of Agr.) 



