FUNGI AND FUNGICIDES. 11 



TOMATO ROT. 



When the fruit of the tomato is about half grown it is sub- 

 ject to the attack of rot. The first appearance of this disease 

 is a small blackish-brown spot, which rapidly increases in size. 

 The underlying tissues of the fruit are destroyed by the fun- 

 gous threads, and the side of the fruit affected becomes flattened. 



Wherever this disease appears it can be checked to a certain 

 degree by thinning out the plants and allowing more sunshine 

 to reach the fruit. 



Spraying with the' Bordeaux mixture (formula B) when the 

 fruit is first forming will often check the fungus. 



POTATO BtlGHT OR ROT. 



This disease attacks the leaves, stems, and tubers. It is first 

 noticed upon the leaves by the sudden appearance of brownish 

 or blackish areas, which soon become soft and foul-smelling. 

 This disease generally occurs in our coast counties and other 

 sections where plenty of moisture exists. The presence of a 

 few successive hot, dry days in these districts checks its rapid 

 development. 



Spraying with the Bordeaux mixture (formula B) when the 

 growth just appears above ground, especially in sections where 

 this fungus is known to exist, is very important. Affected 

 potatoes should never be used for seed, and all vines remain- 

 ing after harvest should be burned. 



POTATO SCAB. 



This is a very widespread disease, and is readily recognized 

 by the dark, rough surface which occurs in spots all over the 

 tubers. 



This disease can be successfully controlled by treating the 

 seed potatoes in a solution of corrosive sublimate. Immerse 

 them for a couple of hours in the liquid, and after their re- 

 moval allow them to dry before cutting them for planting. 

 All potatoes thus treated, if not planted, must be destroyed, as 

 there is sufficient poison on them to make them dangerous to 

 use as food or to feed to stock. 



