318 



GARDEN GUIDE 



Leaf spot. See Blackberry. 



ROSE 



Black spot (Diplocarpon rosae). Cir- 

 cular or oval black patches with indefinite 

 margins on the upper side of the leaves. 

 Often whole leaves become covered when 

 these spots run together. Affected leaves 

 turn yellow and fall prematurely. Spray 

 with ammoniacal copper carbonate or dust 

 with sulfur. 



Powdery mildew (Sphaerotheca pan- 

 nosa). Powdery patches on the leaves and 

 sometimes on the young shoots. Dust with 

 sulfur. 



Squash. See Cucumber. 



STRAWBERRY 



Leaf spot (Mycosphaerella Fragariae). 

 Small red to purplish spots which, as they 

 enlarge, become grayish white and papery 

 in the center with a purplish border. 

 Remove the diseased leaves before sef^ing 

 plants and spray with Bordeaux mixture 

 (4-4-50). Mow leaves after fruiting and 

 burn over the patch. 



SWEET POTATO 



Black rot (Sphaeronema fimbria turn) . 

 Dark brown to black patches on the surface 

 of the Potatoes indicate rotted portions 

 beneath. The affected parts are dry and 

 black. Avoid diseased sets and plant in 

 soil that is not infested. Practice crop 

 dotation. 



Soft rot (Rhizopus nigricans). The 

 potatoes become soft and wrinkled and a 

 white, moldy growth develops on their 

 surface. This later takes on a gray to 

 blackish appearance. Store in a cool, 

 dry, well ventilated cellar and from time to 

 time remove all diseased Potatoes. 



TOMATO 



Blossom end rot. (Cause unknown.) 

 A black, dry rot which occurs at the 

 blossom end. Greatly influenced by the 

 soil moisture. Increase the water holding 

 capacity of the soil by proper cultivation, 

 irrigation and addition of organic matter. 



Leaf spot (Septoria Lycopersici) . Small 

 numerous circular spots with definite 

 margins on the leaves. Small, black, 

 pimple-like structures develop toward 

 their centers. Spray thoroughly with fish 

 oil soap-Bordeaux, especially the lower 

 surfaces. Remove diseased leaves. 



TULIP 



Blight (Botrytis parasitica). On the 

 dormant bulbs as small black bodies about 

 the size of pinheads. Causes a spotting of 

 the leaves and flowers and finally blights 

 them. When the stem is rotted through, 

 the plant falls over. A grayish fuzz may 

 be seen on affected parts in moist weather. 

 Select clean bulbs to set out in the Fall and 

 in the Spring remove and destroy any 

 diseased plants which may appear. 



For complete works on the subject of this chapter 

 we recommend 



DISEASES OF CULTIVATED PLANTS AND TREES, by George Massee. 

 A valuable addition to agricultural literature, by the well-known author of "Plant 

 World," ''British Fungus Floral," etc. Illustrated. Cloth. 8vo. Price, $2.90 



postpaid. 



DISEASES OF ECONOMIC PLANTS, by F. L. Stevens and J. G. Hall. 

 A work designed to meet the needs of those who wish to learn to recognize and 

 treat plant diseases without the burden of long study as to their causes. It indicates 

 the chief characteristics of the most destructive plant diseases of the United 

 States, and gives information regarding the best methods of the prevention and 

 cure of these diseases. Illustrated. Cloth. 12mo. Price $2.15 postpaid. 



FUNGOUS DISEASES OF PLANTS, by Benjamin Minge Duggar. Every 

 known fungus is classified and named, and numerous illustrations render con- 

 siderable assistance to the unorthodox student in fixing identification. The 

 principles and methods of soil sterilization are also covered. Price $2.75 postpaid. 

 Secure your copy where you bought your Garden Guide. 



