220 Agricultural Experiment Station, Ithaca, N. Y. 



minute micrococcus. Experiments necessary to the determination 

 of this as a specific organism producing tliis particular tomato 

 disease have not been made. Nor were other nutrient solutions 

 used, which might have been more acceptable food for the microc- 

 cus in a pure culture. 



"I can not feel sure that this disease was caused primarily by 

 bacteria, which were centainly not present in great abundance. 

 From microisoopic examination of a considerable number of leaves 

 from various sources, au.d* observations in relation to this disease, 

 on winter-grown tomatoes elsewhere, I think that no injurious 

 effects of bacteria will appear, if houses are kept clean, properly 

 heated and ventilated, so that the vitality of the plants will not 

 be impaired, and also if the houses are renovated at intervals." 



We are carrying diseased plants over the summer, and a criti- 

 cal study of the disease will probably be made the coming winter. 

 We shall also be glad of any experience which others may have 

 had with the trouble, and specimens, of affected plants are desired. 



Various treatments have been tried upon this disease. Our 



first attempt was thorough spraying with ammoniacal carbonate 



of copper, and this in the one which fli'st suggests itself to grow- 



ei's. Our efforts, although carefully made at intervals, were 



wholly unsuccessful. It was then thought that treatment of the 

 son in which new^ plants were set might prove effective, and as 



our crop was grown in boxes — as shown in Fig. 2 — the experi- 

 ment was easily tried. 



Boxes in which diseased plants had grown were emptied and 

 the insides were thoroughly washed with various substances, as 

 follows: Three with dilute solution of ammoniacal carbonate of 

 copper; two with lime whitewash; one with Bordeaux mixture; 

 two with lye. Fresh soil was placed in these boxes and healthy 

 /oung plants were set in them. The boxes were then placed in 

 the tomato house, near both healthy and diseased plants. For 

 three or four weeks the plants appeared to be healthy, but after 

 tihat time the disease attacked them all without respect to treat- 

 ment. The same result followed thorough watering of the soil 

 with ammoniacal carbonate of copper, nitrate of soda and lye. 

 Fig. 2 shows a box which was treated once with ammoniacal car- 



