771 



was conspicuous ou tlie leaves late iu September." The yields of bas- 

 inets of marketable fruit from tlie rows used iu the expeiimcnts of 1890 

 aiul 181>1 were as follows: Two rows sprayed with Jjordeaux mixture, 

 71.5; two rows sprayed with ammouiacal carbonate of copper (1890) 

 and with precipitatedcarbouate of copper (1891), 7; five untreated rows, 

 1. Tlie expense of treating the two rows with llordeaux mixture was 

 $4.L'0. The 71.5 baskets of fruit from these rows were sold for $53.62, 

 leavinii- a profit of >ifV.)A2. Tlie results of the treatment with r.ordeaux 

 mixture are clearly sliown in the plate a(C(»mi>anyin.i;' the text. 



Tlic superiority of liic IVuit Iroiii tlic rows sjiraycdwith Uovdcnux iiiixtiirc asconi- 

 ]>ar('(l witli tliat from the other treated rows in regard to the quality, was quite 

 reuiarkaMc. While the yield from tlie carbonate of eopiier rows was very fair as 

 rej;ards quantity, the fruit was so badly injured by the spot and moi^ especially by 

 beiu.n' " wormy," that only tlie very small (|uantity of fruit above stated was found 

 to be marketable. The ajipaient effectiveness of the Bordeaux mixture in keeping 

 oif the quince " ma,y.i;<it" sujigests the advisability of using an insecticide with the 

 fungicide iu the first two treatments, as is often done in spraying for the codling moth 

 and a]q)lc scab. * * * 



The api)lication of the fungicide in the present case was made much more effective 

 than in tiu» previous year, and a perfectly even distribution of the material insured 

 by means of a plunger, which was worked in the barrel by the person who pumped. 

 This consisted of a broomstick with a short piece of board screwed on the end ami 

 was worked through a small hole bored in the top of the barrel. 



Potato scab, R. Thaxter, Ph. D. (pp. 153-lGO).— Culture and 

 infection tests in 1891, similar to those recorded in the Annual Report 

 of the station for 1890 (see Experiment Station Record, vol. in, p. 9), 

 contirnu'd the previous observations of the author regarding- the fun- 

 gous luiture of i)otato scab. The author is inclined to believe that the 

 " deep" and " surtace " forms of the scab are simjily variations of the 

 same disease. Reference is made to the investigations of the fungus 

 and a bacterium associated with potato scab, by II. L. Bolley, M. S., as 

 reported in Bulletin No. 4 of tlie North Dakota Station (see Experiment 

 Station Record, vol. in, p. (119). In connection Avith the artificial 

 infection of growing tubers with the pure scab fungus, an attempt was 

 made to inoculate tubers with a fungus mentioned in the Report for 1890 

 and dou])tfully referred to Oofuwra perpusUla hy Saccardo. '' Pure cul- 

 tures of this fungus were obtained from horse dung, on which it always 

 appears as a whitish coating, but when transferred to the potato 

 tubers no effect whatever Avas i)roduce(l." 



Sulphur and muriate of potash used as fertilizers in a field experiment 

 did not reduce the amount of scab on tubers grown on infected land. 



On a piece of new land on the station grounds 178 hills of potatoes 

 were planted. The methods and results of the treatment were as fol- 

 lows : 



Set a, twenty-eight hills, planted with scabbed seed known to be attacked by the 

 scab fungus, every second hill unfertilized, the rest fertilized with mixed fertilizer; 

 G6.5 per cent scabbed badly in all hills. 



