ISTew Yokk Ageicultukal Expeeiment Station. 453 



Avith dark olive-green mold. In this stage the summer spores are 

 produced which sj^read the infection to other trees. 



Late in the season the knot becomes hard with a black surface, 

 which finally becomes covered with fine black pimples inside of 

 which are matured the winter spores. The winter spores escape 

 late in winter or early in spring and serve to spread the disease. 

 A more extended discussion of this disease is given in Bulletin 40 

 of this Station, and in the Annual Report for 1893, page 686. 



Treatment. — The best known remedy for this trouble is to cut 

 out and burn the knots. They can be found most readily after 

 the leaves have dropped in the fall. They should then all be 

 removed before mid-winter so as to be sure of destroying them 

 before the spores mature and escape. Early in the summer the 

 new knots should be watched for and promptly removed and 

 destroyed. The infection frequently comes from the knots on 

 neglected plum or cherry trees along fence rows or in neighbor- 

 ing orchards. In removing the knots the branch should be cut 

 off three or four inches or more below where the knot appears, so 

 as to remove the threads of the fungiTS that may extend down the 

 branch to a considerable distance from the knot. The same dis- 

 ease also affects various wild plums and wild and cultivated 

 cherries. It is rarely found on sweet cherries but sometimes is 

 very destructive to the Morello class. 



FEUIT EOT. 



(Monilia fructigena P.) 



The ripe rot or fruit rot of the plum is caused by the same fun- 

 gus as that which causes the rot of the cherry fruit. 



Treatment. — The treatment advocated for the leaf-spot will 

 hold this disease in check somewhat. The spraying of the ripe 

 fruit presents the same diflSculties as it does with the cherry. 

 See page 420. 



When there is reason to fear that the disease will attack the 

 blossoms, treatment with Bordeaux mixture should be made just 

 before the blossoms open. Thinning the fruit is no doubt a par- 



