— 199 — 



Fortunately experiments during the past two years have 

 proven — so we are assured on good authorit}^ that this dis- 

 ease in all its phases, can be entirely controlled by the use 

 of the copper solutions. -i^ No nurseryman or fruit-grower 

 need suffer further loss therefore, if he sprays the leaves once in 

 two or three weeks in the early part of the growing season, aud is 

 careful to renew the spraying after heavy showers. 



Considerable has been written concerning the habits of this par- 

 asite. It is believed to be chiefly reproduced through itsconidia, 

 (the spores figured in this paper), but Sorauerf claims to have 

 discovered perithecia with ascospores or resting spores, on old 

 leaves late in the autumn ; such, however, have not l>een reported 

 in America. Indeed there are many hidden facts connected with 

 the hibernation of this fungus, and the sources of its infection in 

 the spring, which if known may lead to precautionary care such 

 as may save time and moue}' to the fruit-grower. One of the stu- 

 dents in this laboratory is now at work on this question, has con- 

 tributed the drawing (No. 5) would be glad to correspond on the 

 subject, and will publish the results of the work if new facts are 

 developed. 



The Clover Rust [ Uromyces Trifolv, (Alb. and Schwein. ) Wint.] 

 is another recent arrival from the Old World, and has destroyed a 

 great amount of the host-plant this season. If corre.spondents can 

 furnish us with w^ell-considered estimates of the injuries caused in 

 different localities or the history of its appearance, such facts may 

 prove of value to us in investigations now going on. 



W. R. DUDI.EY. 



ENTOMOLOGICAL DEPARTMENT. 



THE APPLE TREE TENT CATERPILLAR. 

 Clisiocavtpa aniericana. 



During the last few years the orchards in many parts of this 

 State have become overrun by the Apple-tree Tent-caterpillar. 

 In certain sections this insect has increa.sed to so great an extent 

 that it has destroN'ed every leaf in the orchards. Although the 

 habits of this insect have been well known to entomologists for 



* vSee Garden and Forest Dec. 4, 1889, p. 582. 



t Pflauzeiikrankheiteii Ed. II., Vol. II, p. 371. Plate XVI. 



