270 VEGETABLE FOES AND DISEASES 



intervals, prevents attack from and spread of the dis- 

 ease. The potassium sulphide, popularly known as 

 liver of sulphur, should be dissolved in a quart of hot 

 water, then made up to two and a half gallons with cold 

 water. 



Ammoniacal carbonate of copper solution may also 

 be used as a preventive, and being a clear liquid does 

 not stain the fruit. Its formula is : 



Water. ..... 9 gallons. 



Aqua ammonia (26 strength) . I 2 fluid ounces. 

 Copper carbonate I ounce. 



Form the copper carbonate into a thin paste with 

 six fluid ounces of water, add the ammonia water slowly, 

 and to the deep blue clear solution thus obtained add 

 the water and stir well. It is sufficient in spraying to 

 coat the plant with the finest possible film of the solu- 

 tion, and not to use it after the fruit has developed to 

 three quarters its proper size. 



THE ILLUSTRATIONS REPRESENT TOMATO BLACK SPOT. 



A, affected Tomato plant : #, in setting fruit causing it to turn 

 black ; b, attacked stem called " black stripe," the mark running 

 in line of stem ; c, stripe on petiole of leaf, which also occurs 

 on midribs and veins of leaflets ; </, leaflets affected with " curl " 

 and producing brown or blackish blotches ; e, black stripe on 

 young fruit ; f, attack in ribs of fruit called " black stripe " ; 

 g, fruit attacked at eye ; h, fruit infested at heel ; /, fruit at- 

 tacked on side ; j 9 black stripe more advanced ; k f black 

 blotch more developed ; /, black spot more characterised. B, 

 fruit affected with " black stripe " and " spot " : m, " black 

 stripe " ; , " black spot ". C, fruit affected at eye with blotch 



