152 MONTANA EXPERIMENT STATION. 



and over the ground. A number of instances came to my attention 

 during the summer where these doughty little soldiers had found 

 iniprotected larvae and were struggling away down llif tree with 

 them. A small per cent of the pupa cases opened were found to 

 <:ontains Chalcid flies in various stages of existence. Usually these 

 had devoured the pupae and were completing their transformations 

 neatly enclosed in the pupae of their former hosts. Quantities of 

 large gray spiders were always in and about the tree and in the 

 crevices of the cage.. In a nmnber of cases the adult spider built 

 her nest and laid her eggs upon leaves containing bud moth larvae. 

 These spiders were most noticeable during the pupation period in 

 July and it was fovmd^that the crevices of the cage were filled with 

 cocoons of the bud moth containing adult larvae or pupae. Nests 

 containing young spiders were invariably stored with them and the 

 ■cocoons were speedily emptied by the young Arachnids. While it 

 is never safe to rely entirely upon natural enemies for the control 

 <of the pest, yet they deserve a large share in the orchardists's con- 

 sideration and should never be destroyed by him. 



SOME INSECTS TO BE WATCHED FOR BY OUR 

 INSPECTORS AND FRUITGROWERS. 



We have attempted to bring together in the following pages in- 

 formation that will be of \'alue to our horticultural inspectors, fruit- 

 growers and others interested in the preventive campaign Montana 

 is making against insect pests of fruit. We believe that the geogra- 

 phical arrangement of the valleys of Montana which have climatic 

 conditions that permit of the successful growing of fruits make it 

 possible to do much to prevent the introduction and spread of insects 

 and fungus pests. The dififerent fruit regions are so isolated one 

 from another that pests from any one infested region in the state 

 are scarcely more liable to be transferred to another than are the 

 pests from an infested region outside of the state. It is therefore 

 of the greatest importance that all persons interested in the fruit 

 industry should acquaint themselves with the appearance of the 

 pests that are most liable to be introduced. We have included in 

 the list here discussed, various species that have appeared in one 



