48 



FARMERS BULLETTN 



the disease is as yet unknown, but it is certain that it is carried 

 from plant to plant by insects, by pickers, and in other ways. 

 It may appear as early as July 10 in the Middle West. Satis- 

 factory control measures have not been discovered, but the plants 

 should be kept covered with insect-proof cages as late as possible to 

 keep insects off. Later they should be dusted with equal parts of 

 tobacco dust and lime or sprayed with Bordeaux mixture and lead 

 arsenate (half a pound dry to 10 gallons). See " Striped cucumber 

 beetle" (p. 43). 



DOWNY MIT.DEW. 



Downy mildew is a fungous disease which attacks the leaves during 

 warm, moist weather after the middle of the season, causing yellow- 

 ing, with faintly defined angular spots, followed by curling and death 

 in a few days. The oldest leaves are attacked first. If the plants are 

 sprayed thoroughly with Bordeaux mixture every 7 to 10 days, 

 beginning when the first symptoms of the disease appear, they 



can be kept in bear- 

 ing condition for 

 two or three weeks 

 longer than un- 

 sprayed plants. 



Scab is a fun- 

 gous disease which 

 attacks • the young 

 leaves, stems, and 

 fruits, causing sun- 



-Cufumbor mosaic di&i' 



: " white pickle." 



ken, gray spots on the fruits which spoil them for use. The disease 

 does not appear until late in the season. In moist weather it is often 

 very severe and every fruit on a plant may be affected. Because of 

 the rapidit}^ of spreading under ordinary conditions and the fact 

 that it attacks the young fruits even when in the blossom stage, it is 

 extremely difficult to control. 



GENERAI, RECOMMEXDATIOXS FOR THE CONTROL OF rUCl'MHEU DISEASES IX GARDENS. 



Disinfect seed by soaking five minutes in dilute formaldehyde (1 

 teaspoonful to 1 cup of water), wash in Avater, and dry or plant. 

 Plant in hills and cover with insect-proof cages and keep these on as 

 long as possible. If insects are troublesome when cages are removed, 

 some will be destro3'ed by dusting plants with equal parts of tobacco 

 dust and air-slaked lime or by spraying with lead arsenate (one-half 

 pound dry or 1 pound paste to 10 gallons of water). Pull and burn 



