C()XT1:\TS 



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Introduction 17 



Life history and habits 18 



Demonstration work in canker-worni control 20 



Recomiuendations 21 



ILLUSTRATIOXS. 



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 Plate III. Stajies and work of spring canker-worm i I'lihucritu rcruata 

 IVck). FiiT. 1. — Egg mass on bark scale. Fig. 2. — The 

 larvjc or canker-worms. Fig. ;>. — Pupse. Fig. 4. — Female 

 moths. Fig. 5. — Male moth. Fig. 6. — Work of canker- 

 worms on ai)ple leaves when small. Fig. 7. — Later work of 



the larvje, only the midribs of leaves being left 18 



IV. Trees defoliated by spring canker-worms and effects of treat- 

 ments. Fig. 1. — Defoliated trees in Lupton orchard. Fig. 

 2. — The same trees a year later. Fig. 3. — Defoliated trees 

 in the Purcell orchard. Fig. 4. — An ad.lacent row of trees 

 protected by applications of arsenate of lead 20 



