INJURING THE ROOTS. 79 



has been added some glue. The idea is that in this 

 wa}' the bark will be so coated with poison that many 

 of the young larvae will be destroyed while eating 

 their way through to the sapwood. 



The Black Peach Aphis. 



Aphis persicse-niger. 

 This is a shining black aphis, that occurs in great 

 numbers upon the roots, twigs and leaves of the 

 peach in the Atlantic States. The root-infesting 

 specimens seem to be especially injurious, causing an 

 enfeebled condition of the tree that has sometimes 

 been mistaken for the disease known as ' the yellows.' 

 These insects reproduce viviparously, or by giving 

 birth to living young, and, consequently, like other 

 aphides, they are able to multiply with remarkable 

 rapidity. There are two forms, one wingless and the 

 other winged, both having shining black bodies ; 

 and sucking out the sap of the tree through their 

 tiny beaks. 



Remedies. — The best results seem to have been 

 attained in fighting the under-ground form of this 

 insect by digging into the soil about the roots refuse 

 tobacco, either in the form of powder or stems. 

 Kainit is also said by New Jersey peach-growers to 

 serve a similar purpose. The aerial specimens are 

 open to destruction by spraying with kerosene 

 emulsion. 



