150 The Fruit-Growers Guide-Book 



Bagworm. These insects infest nearly all kinds of trees 

 and shrubs, and will consume a large quantity of foliage 

 during the summer, frequently defoliating the trees com- 

 pletely. It is the larva of a moth, that over-winters in 

 the egg stage within the old female bags. In the late 

 spring the young hatch from the eggs and crawl out 

 on the twigs to the nearest leaf, where they begin to feed 

 and begin the work of spinning the bags for them- 

 selves. This is a curious and interesting process. Into the 

 construction of the bags the larvae add fragments of the 

 foliage and leaf stems, securely fastened together with silk. 

 It is easily controlled with arsenical sprays. 



Red Spiders. These are extremely small insects which 

 work on the under surface of the leaves of many plants. 

 They are common in greenhouses, and in the semi-arid sec- 

 tions of the West they are becoming quite destructive to 

 orchard and ornamental trees and shrubs. When present 

 they cause the leaves to become yellowish in spots, and 

 upon examination the under surfaces will be found covered 

 with an extremely fine web. The adults will appear as 

 very small red or brownish specks crawling under the web, 

 and their eggs as minute glistening beads attached to the 

 leaf in the meshes of the web. The adults are just large 

 enough to be seen with the naked eye. 



In the greenhouse they can be kept in control by daily 

 syringing with cold water. In the field such means are 

 impracticable, but the Colorado experiment station reports 

 that they were able to keep red spiders controlled by 

 spraying their plants with sulphur and soapy water as 

 used for the brown mite. 



Strawberry Insects 



Leaf Roller. This insect appears early in the spring as 

 a small brown moth, measuring about half an inch across 

 the wings. It deposits its eggs on the leaves of the straw- 

 berry. The larvae are greenish brown, and when full 

 grown, nearly half an inch in length, but rather slender. 

 They mature in June, after having spun a web which 



