THE MONTHLY BULLETIN. 115 



Apple Mildew. 



Apple mildew dwarfs the tips of the new shoots and the leaves, 

 covering: them with a white mildewy growth. In Bulletin 120. Bureau 

 of Plant Industry, by W. S. Ballard and W. H. Yolck. it is stated that 

 there are two sources of infection in the spring, when the foliage begins 

 to come out. In July there are irregular dark patches which contain the 

 winter spores of this fungus, which remain on the twigs until early 

 spring, at which time they germinate and start infection. The other 

 source of infection is termed dormant, being the mildew remaining 

 dormant under the bud scales during the winter and becoming active 

 in the spring, producing injury almost immediately after the buds 

 unfold. 



The authors of this bulletin have found that an iron sulphide mixture 

 or sulphur in some finely divided form will be satisfactory. The first 

 application is made Avith the calyx spray for codling moth. Pruning is 

 found to be effective in checking the disease, all mildewed tips being 

 removed during the winter season. 



Peach Leaf-Curl. 



The leaf-curl fungus may cause the entire defoliation of the peach. 

 The branches and fruit, as well as the flowers, are also subject to attack. 

 Gummy exudations often appear on the new twigs, which often become 

 distorted as a result of infestation. The leaf curl fungus also causes 

 curling and distortion of the leaves. 



Apply commercial lime-sulphur. 1-10. or Bordeaux mixture. 5-5-50 

 formula, just before the buds open in the spring. Subsequent spray- 

 ings are of little or no importance. A thorough application is neces- 

 sary in order to make these fungicides effective in controlling the 

 disease. 



The Brovvrn Rot of Stone Fruits. 



The brown rot fungus is another fungous disease injuring stone 

 fruits. It causes the fruit to decay while still on the tree besides 

 attacking the flowers and new shoots, which die back. Also, fruit in 

 shipment or in the market is damaged. The peach, plum, apricot and 

 cherry are hosts. 



R. E. Smith, in Bulletin 218, California Experiment Station, states 

 that no definite remedy has been found in California, but a self-boiled 

 lime-sulphur spray, used just as the fruit is setting, and again after 

 the rains are over, is recommended for trial. 



