15 



its iitt.iL'ks. On other species of our luitive trees helonging to tiie genus 

 Primus, tlie l)lack-knot has not yet l)een positively detected, such as 

 the beach-})him {Prunus maritima) ; the rum clierry {Prunus serotina) 

 and the Chickasaw i)hnii {Primus Chickasa). 



To prevent the disease in cherry and phim orchards, the following 

 treatment is recommended. AVhen a knot makes its ap})earance, the 

 branch should he cut off a short distance helow the slight swelling 

 of the stem, which is found just below the knot. AVhen cut oft", the 

 branches should Ije l)urnt, to prevent the sjiores from spreading the 

 disease. The question arises as to the best time for cutting off the 

 diseased branches. We should say, cut them off whenever one sees 

 them. Not only should diseased branches of cultivated cherries and 

 plums be removed, but all means should be taken to destroy the 

 choke cherry, the bird cherry and the wild plum, in the neighbor- 

 hood of orchards. In New England, })articularly, the choke cherry 

 can only be regarded as a pest. AVc notice that Mr. Emerson, in 

 the new edition of his "Trees and shrubs of Massachusetts," recom- 

 mends the choke clierry as worthy of cultivation on account of its 

 beauty. However opinions may dilfer as to its beauty, there can only 

 be one as to its injurious influence on cherry and plum orchards ; 

 and it cannot be too strongly im})ressed u})on fruit growers, that the 

 choke cherry is a most dangerous enemy, and should be destroyed. 

 It is quite time that it was generally understood, that many of our 

 herbaceous and shrubby plants cause, or at any rate, increase disease 

 in our vegetables and fruit trees. The farmer destroys caterpillars 

 Avherever and whenever he finds them, why should he not also cut 

 down and destroy all trees and shrubs which carry a contagious 

 disease into his orchards? 



The attention of Entomologists is directed to the annual 

 meeting of the Entomologists Cluh of the American Association 

 for the Advancement of Science, wliich Avill be held at Saratoga 

 on Tuesday, August 2G., at which all interested arc invited to be 

 present. 



BOOK NOTICES. 



Bulletin of the Brooklyn Entomological Society, 18T0, April. 

 Graef E. L. (p. Oo). On Acronycta Walkeri and Orthosia lutosa 

 Andrews. (The author, after an examination of Andrews' tyi)es, re- 

 fers Walkeri as a synonym to alborufa, and considers lidosa as a s))ecies 

 probably previously unnamed.) 



