454 RrroRT of the Horticulturist of the 



tial pl•e^Tntive, because when the rot attacks one of a cluster of 

 fruits it usually spreads till every fruit in the cluster is diseased. 

 When the fruits do not touch each other the disease is less 

 destructive. 



LEAF SPOT. 



{Cylindi'osporium padi Karst.) 



This disease is discussed under leaf spot of the cherry. See 

 page 421. In general it is more liable to produce the shot hole 

 appearance on plum foliage than on cherry foliage. 



Treatment. — As a result of extended experiments it can be 

 stated that the plum leaf spot may be controlled by thorough 

 treatment with Bordeaux mixture, 1-to-ll formula. In some 

 seasons two treatments are most economical, but under conditions 

 favorable to the disease at least three should be given.'** If but 

 two treatments be made give the first about ten days after the 

 blossoms fall, but not later than June 1 ; make the second treat- 

 ment about three weeks later. The disease may be better con- 

 trolled by three treatments and usually three treatments will be 

 most profitable. Make the third from three to four weeks after 

 the second. 



YELLOWS. 



The Japanese plums are subject to a disease which has the 

 appearance of peach yellows. It occurs on trees which have been 

 worked on plum roots as well as on those which are on peach 

 roots. ]^o remedy is known. 



The treatment recommended is the same as that which is recom- 

 mended for peach yellows — dig out and burn the diseased trees. 



PLUM INSECTS. 



PLUM CUECULIO. 



{C onotraclielus nenuphar Herbst.) 

 Description. — The adult is a small, peculiar, gray beetle. It 

 passes the winter under the bark of trees, or under rubbish, and 



48 Beach, S. A. Sixteenth Ann. Rept. this Station, 1897: 211. 



