furnished. These things this Bulletin seeks to supply. The further 

 special information needed for dealing successfully with any special 

 case, this Department will gladly and promptly furnish, on receipt of 

 a request accompanied by a specimen of a diseased plant and an 

 account, as full as possible, of the existing conditions, as already 

 stated. 



HYGIENIC TREATMENT. 



There are definite laws of health for plants as well as for animals, 

 and in one case, as in the other, neglect of those laws invites disease. 

 In the first place, plants which are expected to grow and thrive must 

 be furnished with an abundance of the materials necessary to growth. 

 Weak, poorly nourished plants suffer the attacks of parasites of all 

 sorts and have no power to resist them. Secondly, where a crop has 

 suffered from a fungous disease in one season and a good crop of the 

 same kind is desired in the following season, every tangible trace of 

 the disease must be removed. For example, if a vineyard has suffered 

 from mildew or hlacTc-rot^ all diseased leaves and berries should be 

 collected at the end of the season with scrupulous care and wholly 

 burned ; and the same advice applies to a large list of cases. Thus 

 incalculable numbers of the spores of the fungi of the respective 

 diseases will be prevented from infesting the next season's crop. In 

 some cases where the spores remain in the soil, as in the stump-foot 

 of cabbages or the smut of onions, the attacks of the disease can only 

 be avoided by rotation with crops upon which the the fundus in ques- 

 tion cannot live. Thirdly, wild plants, which, being nearly related to 

 a given cultivated one, may be subiect to the same disease, or which 

 bear a complementary spore-form of a pleomorphic fungus* should be 

 carefully excluded from the neighborhood of cultivated ones. Thus, 

 wild cherries or plums, which are equally subject to the black -knot, 

 should be kept away from plum orchards, and spinach fields should 

 be kept free of pig-weed, since both plants are attacked by the same 

 mildew; and again, since red cedars bear one spore form of a fungus 

 whose other form is the rust of apple leaves, it is plain that they 

 should not be allowed to grow near an apple orchard. 



Now, when the general hygienic conditions have been made as 

 unfavorable as possible to the development of disease, we may resort 

 finally to the special protection afforded by the use of 



•'See the Report of tliis Station for 1889, p. 204 and ' 



