106 MINNESOTA STATE HORTICULTURAL SOCIETY. 



CONDITIONS FAVORABLE TO BLIGHT. 

 "Trees in rich, hot and moist localities," are reported by seven cor- 

 respondents as "blig-hting- the most." Two corresjDondents reported 

 'blight worse in wet seasons." Six correspondents said "trees pro- 

 tected by timber belts so as to prevent free circulation of air blig-hted 

 most." Three reported "southern slopes favorable to blight," and 

 one reported "severe pruning was followed b}' the disease." 



CONDITIONS UNFAVORABLE TO BLIGHT. 

 Five correspondents reported "trees on high rolling ground" as 

 "least affected." Five correspondents reported "trees on northern 

 slopes not so badly affected as those on southern slopes." The three 

 who reported against southern slopes should be considered here, 

 making eight in favor of northern slopes as opposed to southern. 

 One correspondent said that "a windbreak on the south of the or- 

 chard aids in reducing the blight." 



Fifth Question. — Are 3^oung and old trees affected to the same 

 degree? 



Twenty-two correspondents reported "young and old trees affected 

 to about the same degree" Six correspondents reported '"young 

 trees most affected." Four reported "old trees most affected." Six- 

 teen correspondents gave no answers to this question. 



Sixth Question. — What did you estimate your annual loss to be 

 by this disease? 



Seven correspondents reported "loss small on account of destruc- 

 tion of diseased parts." Two reported "loss small on account of 

 planting non-blighters." Eleven correspondents reported an aver- 

 age loss of "five to ten per cent." "More than ten per cent." (fifteen to 

 fifty), "mostly in the nursery row," reported by five correspondents. 

 "Loss small with no care taken," reported by two correspondents. 

 Four correspondents said that their trees were "not troubled with 

 blight," and sixteen gave no answer to this question. 



summary. 



In bringing together the results of this inquiry in the form of 

 a summary, I shall simply indicate, with few comments, the direc- 

 tion of the evidence gathered above. 



VARIETIES AFFECTED. 

 The evidence indicates that certain varieties of apple trees are less 

 affected than others, but that few, if anj^, varieties are proo/ against 

 the disease. 



conditions. 



It appears that such conditions as hot, moist localit}', rich soil, 

 lack of free circulation of air (on account of protection by wrnd- 

 breaks, etc.) cause a waterj'^ or succulent growth of the tree which is 

 favorable to l)light. 



On the other hand, high, rolling, well drained ground of north 

 slope and free circulation of air offers the most favorable conditions 

 for hardy growth of the trees, which are, therefore, less liable to 

 blight. 



