552 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



all, the males devoting their time during the day to flying about 

 and making a noise, while the voiceless females busy themselves 

 depositing eggs. " If the young nymphs do any injury to the 

 roots of trees or plants, it is very rarely perceptible. The adult 

 females, however, are capable of causing serious injury to young 

 fruit trees in orchards and nurseries by the numerous punctures in 

 the twigs, limbs and main stems made by them in the act of 



Fro. 403. The full-grown nymphs of the periodical cicada in different stages 

 of molting and the newly emerged adults with body and wings still soft 

 and white. 



ovipositing. The egg puncture makes an ugly wound, beyond 

 which the twig dies, and the foliage of large trees on which 

 hundreds of cicadas have oviposited turns brown, as if the tree 

 had been scorched by fire. On young trees this results in destroy- 

 ing the growth of a year or two and misshaping the tree, and the 

 scars which remain later furnish points of attack for borers and 

 the woolly apple-aphis. 



