452 



Report of the Hoeticulturist of the 



should be combined with the Bordeaux mixture. A second 

 brood of this insect usually appears in August. The only thing 

 to be done is to spray when the indications are that the slugs are 

 numerous enough to be injurious. On low trees they are some- 

 times treated with air-slaked lime or road dust, by throwing the 

 dust or lime over the trees. 



General Tri:atment Against Diseases and Insects which Attack the 



Peae. 



When to spray. 



1. Just before blossoms open. 



2. Just after blossoms fall. 



3. From ten to fourteen days after 2. 



What to use and what the treatment is for 



Bordeaux mixture^G against the scab, 

 leaf blight, leaf spot and canker dis- 

 ease. 



Bordeaux mixture^c against the scab, 

 leaf blight, leaf spot, etc. 



Paris green^T against codling moth 

 and leaf-eating insects generally. 



Bordeaux mixture46 against the scab, 

 leaf spot, leaf blight, etc. 



Paris green47 against codling moth 

 and leaf-eating insects generally. 



For treatment of fire blight, bud moth, case bearers, etc., con- 

 sult the special notice of these subjects on previous pages. 



PLUM DISEASES. 



BLACK KNOT. 



{Plowrightia morhosa (Schw.) Sacc.) 

 Description. — This disease causes sw^ellings underneath the 

 bark, finally rupturing it and developing a spongy texture covered 



46 Use Bordeaux mixture, 1-to-ll formula. Directions for making and ap- 

 plying are given in Bulletin 121. The Paris green or other arsenicals may be 

 mixed with the Bordeaux mixture if desirable to apply both at one time. 



47 Use Paris green at the rate of 1 pound to 150 gallons of water, with 

 about two pounds of fresh slaked lime added to make it adhere, and to pre- 

 Tent injury to foliage. Green arsenite of copper, arsenite of lime, or other 

 poisons may be used instead of Paris green, as directed in Bulletin 121. 

 These arsenicals may be mixed with Bordeaux mixture instead of water, at 

 the same rate as given above. In that case, not much extra lime need be 

 added. 



