MYXOGASTRES 357 



planting cabbages, turnips, etc., in diseased soil ; on the 

 other hand, repeated experiments have proved that the 

 application of quicklime destroys the germs in the soil. 

 In the New Jersey Agricultural Coll. Experime?it Statiofi, 

 Bulletin No. 98, devoted to the subject, it is stated : ' Lime 

 is an effective preventive of the club-root, and, by its 

 constant use, at the rate of seventy-five bushels or so 

 per acre each year, cabbages have been grown at frequent 

 intervals — almost yearly- — upon the same soil.' 



The use of artificial manures containing acids, phos- 

 phates, and sulphates, favours the spread of the disease. 

 It has been demonstrated that soil from an infected 

 locality, carried by means of cart-wheels, tools, etc., is 

 sufficient to start the disease in a new locality. 



AVeeds such as shepherd's-purse, charlock, garlic- 

 mustard, and other crucifers should not be allowed to 

 grow in places where cultivated plants belonging to the 

 same Order are grown. 



Do not throw diseased plants on to the manure-heap, 

 but burn them. 



Dr. Halsted states that the plants are most susceptible 

 to the disease during the first three weeks after germina- 

 tion, and that thirty -five bushels of lime per acre is 

 sufficient to arrest the disease. 



Woronin, Fringsh. Jahrb., vol. xi., 1878, 6 pi. 

 Marshall Ward, Diseases of Plants, p. 47, figs. 

 Eycleshymer, y6'/'<;/';/. MycoL, vol. viii. p. 79, 2 pi. 

 Massee, Froc. Roy. Soc, vol. Ivii., 1895. 

 Halsted, Ajnerican Gard., vol. xix. p. 373 (1898). 



