FUNGI 19 



sulphide if growing indoors, or with dilute Bordeaux mixture 

 if outdoor shrubs or trees. 



Numerous diseased portions of plants find their way to 

 the manure-heap, either directly- — which is a serious mistake 

 to commit at any time or under any circumstances — or 

 indirectly, after being used for fodder, as rusted straw of 

 cereals, chaff, also roots, tubers, etc. In a sweating, moist 

 manure-heap, the numerous spores and sclerotia present in 

 such diseased plants find a congenial home, multiplying 

 rapidly under various spore-forms as saprophytes; and if 

 the manure is used while fresh or green, a disease will in 

 all probability follow, if the plants manured happen to be 

 of the kind the fungus-spores can attack. ' Smut ' of cereals, 

 drooping disease of paeonies, and many other diseases, have 

 been proved to have been introduced with manure. 



The practice of burying prunings, as followed in some 

 tea plantations, should be discontinued. Such should be 

 burned. The small amount of advantage gained in the 

 way of manure is not a sufficient justification, as against 

 the possible, or probable, danger of further spreading a 

 disease by following this practice. 



Do not throw diseased plants on to the manure-heap, nor 

 into piggeries, etc. Fresh or green manure should not be used 

 for land intended for cereals. Only old and thoroughly rotten 

 manure should be placed on the ground over the roots of rose 

 trees, young orchard or forest trees, or over perennials that 

 die down in the autumn. 



The destructive sugar-cane disease {Trichosphaera sac- 

 chart) was disseminated wholesale by the thoughtless 



