212 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



pint to 30 gallons of water. The remainder of the field was 

 planted with seed tubers from the same lot just as they came 

 from the bin without selection or disinfection. They were, he 

 said, such as would generally be classed, so far as appearance 

 goes, as good quality of seed stock. 



Mr. Hussey made frequent and careful examinations of this 

 field during the summer and reported that from 5 to 8 percent 

 of the plants where the untreated seed was used were killed by 

 blackleg. . Only 2 plants so affected were observed during the 

 entire season on the acre where the selected and treated seed 

 was used. 



In 191 1 Mr. Hussey experimented with both Irish Cobblers 

 and Green Mountains. The Irish Cobbler field was sod land and 

 consisted of about 5 1-2 acres planted with seed from the 

 treated portion of last year's field. The treated and untreated 

 portions were located in alternate strips across the field, thus 

 making a very fair test with regards variation in soil conditions. 

 This field was given a superficial examination on July 6 and a 

 thorough examination on July 19. No blackleg could be found 

 on the entire field on either visit. Mr. Hussey stated that he 

 had examined the field several times during the season and 

 failed to find any diseased plants, thus showing that selection 

 and disinfection in 1910 entirely eliminated the disease from 

 his crop. Unfortunately there was none of the crop from the 

 untreated portion of the 1910 field planted this year as a check, 

 but past experience makes it absolutely certain that if planted 

 it would have produced quite a percentage of diseased plants 

 this year. 



Mr. Hussey's experiment with the Green Mountain variety 

 was upon land where potatoes were grown last year and more 

 or less blackleg was observed. It furnished the most striking 

 example in the series of the effectiveness of disinfection when 

 properly done. The field consisted of about 6 acres. About 

 2 acres in the middle was planted with untreated tubers. The 

 remainder on either side being disinfected. 



On July 6 no accurate record was made but it was noted 

 that the disease was quite frequent on the untreated portion and 

 no affected plants could be found where treated seed tubers 

 were used. On July 19 approximately one-third acre each of 

 adjoining portions of the treated and untreated strips were 



