AGRICULTURAL EXPERIMENT STATION. 171 



FIG. 22 



The winged male and wingless female are shown highly magnified 

 in'Fig. 22. The real size is indicated by hair lines. 



Eggs — Minute, oval, light yellow or greenish when first laid but 

 gradually change to shining black. 



Young insects — Produced alive, nearly white when born but soon 

 become yellowish green. 



LIFE HISTORY. 



The eggs are deposited in the autumn in the cracks of the bark of 

 twigs and at the base of the buds. The eggs hatch when the buds 

 begin to expand and the lice locate themselves on the 3'oung buds 

 and leaves by means of their beaks and feed upon the juices. The 

 spring brood is composed of females and is about ten days reaching 

 maturity. Each louse gives birth to living young, producing about 

 two a da}' for two or three weeks and then dies. These young 

 become mothers in about ten days and produce. This process is 

 continued through the season, there being many generations mostly 

 wingless females, and without the appearance of males. Winged 

 females are sometimes produced and migrating to other trees spread 

 the pest. Late in the season males are produced with the females 

 and eggs are laid to perpetuate the species, thus completing the life 

 history. 



REMEDIES 



Spray the trees, about the time the buds are expanding, with 

 strong soap suds, or a decoction of tobacco stems or leaves one 

 pound to a gallon of water. Spraying the tree for the codling moth 

 with Paris Green would probably destroy some of the plant lice. 

 The presence of plant lice is indicated by ants which ascend the 

 trees to feast upon the honey-dew secreted by the lice. The plant 



