218 THE MONTHLY BULLETIN. 



FUNGOUS DISEASES OF PLANTS. 



Grape Mildew. 



The grape mildew may be observed as a white powdery growth on 

 the leaves and fruit clusters of the grapevine. Dust thoroughly with 

 flowers of sulphur in moist weather before the fungus develops. R. E. 

 Smith, in Bulletin 218 of the California Experiment Station, states that 

 the mistake made by many people is the failure to treat the vines 

 thoroughly and often enough during the beginning of the growing 

 season. The first sulphuring should be made when the shoots are 

 between 6 and 15 inches long. Every part of the vine should be 

 thoroughly covered, and if this sulphuring is not followed by two or 

 three days of warm weather the sulphuring process should be repeated 

 several times, in order to be effective. The various finely divided 

 sulphur mixtures with water, which have been put upon the market 

 the last two or three years by spraying companies of California, are 

 efficient in controlling this disease. 



The Brown Rot of Stone Fruits. 



The fruit is not only susceptible to the brown rot fungus, but often 

 the tender twigs also are blighted and killed. The half grown fruit 

 is more easily attacked than the young, the disease appearing as small 

 brownish decayed spots, the spots increasing in size until the entire 

 fruit is infected. 



Spray with self-boiled lime-sulphur. Apparently the safest and most 

 effective preparation is made by using 20 pounds of sulphur to 20 

 pounds of good lime. The sulphur is self-cooked from the heat given 

 off by the slaking lime and the mixture is diluted to 100 gallons. 



The Apple Mildew. 



The appearance of the apple mildew is a whitish growth on the 

 new shoots and leaves, which are dwarfed. According to Ballard and 

 "^^olck — Bulletin 120 of the Bureau of Plant Industry — an iron sulfid 

 mixture or sulphur in some finely divided form will be satisfactory. 



Rose Mildew. 



Rose Mildew attacks the leaves and shoots of roses, injuring and 

 often killing them, so that only a few inferior flowers are produced. 

 These whitish growths on the leaves and shoots are conspicuous and 

 easily recognized. 



Thoroughly dusting the bushes with flowers of sulphur every 10 or 12 

 days is usually sufficient. Spraying with a solution of liver of sulphur 

 (sulphide of potash), using one ounce to 3 gallons of water, is recom- 

 mended. In a previous issue of The Monthly Bulletin the strength 

 of this sulphide spray was given as one ounce to 30 gallons of water. 

 This was an error and should have been 3 instead of 30. 



Be sure to cover the undersides of the leaves, as well as the upper 

 sides, and use a fresh solution of this spray each time it becomes 

 necessary to control. 



