SCALE INSECTS. 9 



Prof. J. M. Stedman, state entomologist of Missouri, 



says : '^ 



" One year ago I thought we could have got rid of it in 

 the state for $1,000. I think now it will take $1,000,000. 

 In fact, I think we will have to tight it from now on." 



These extended extracts are given to impress eraj^hat- 

 ically the destructive possibilities of the subject in hand 

 and to show the value of special attention to the pest at 

 this time in our own state. 



Plants Affected. 



The San Jose scale attacks nearly all deciduous fruit- 

 trees and fruit-bearing shrubs. It attacks mainly the rosa- 

 ceous trees and bushes. The range of its food plants will 

 be better shown, however, by the following list prepared by 

 Mr. Howard,* and published in technical series No. 6: Ap- 

 ple, crab-apple, quince, pear, Bartlett pear, dwarf Duchesse 

 pear, plum, Japan plum, Satsuma plum, Prunus pissardi, 

 Pfunus maritinii, peach, apricot, almond, cherry. Rocky 

 Mountain dwarf cherry, currant, black currant. Citrus tri- 

 foliata (this should have been alhopanetatus) , Osage or- 

 ange, grape, elm, cottonwood, European linden, American 

 chestnut, Pyrus japoiiica, Catalpa hignonioides^ walnut, 

 Japan walnut, loquat, red dogwood, June-berry, rose, su- 

 mac, Phothiia glauca, Carolina poplar. 



Reports of trees exempt from attack should be well con- 

 sidered. Varieties of fruits formerly considered free have 

 since proven nourishing hosts for this parasite. 



Appearance of Infested Plants. 



The scale attacks all portions of the tree — limbs, trunk' 

 leaves, and fruit. 



Limbs and Trunk. The scale in some cases, such as 

 pear, prefers the younger growth found at the ends of 

 branches and twigs. Upon peach the older growth is 

 equally preferred. Upon the more recent growth, the scale 



3 In Western Fruit Grower, December, 1897. 

 ^ These are the plants upon which the scale has been actually 

 seen at the division of entomology in Washington. 



