220 DISEASES OF THE SWEET PEA 



tically, however, the syringing is not al- 

 ways done in the proper way to become 

 effective. In this case spraying with a 

 standard contact poison becomes necessary. 

 Next to red spiders, the only insect that is 

 of economic importance is the green aphid. 

 Both of these may be kept in check by the 

 use of "Black leaf 40," using a dilution of 

 one part to one thousand (by volume), 

 Aphin or sulpho tobacco may answer the 

 same purpose. Some growers prefer the 

 use of nico fume tobacco papers. With 

 these all that is necessary is to hang the 

 paper on any convenient nail and to light 

 the end of it. Should mildew appear it 

 may be readily controlled by dusting with 

 flowers of sulphur, or by spraying with po- 

 tassium sulphide, dissolving four ounces 

 of the chemical in ten gallons of water. 

 The solution should be used at once, as it 

 loses its strength by exposure to the air. 



