36 MASSACHUSETTS HORTICULTURAL SOCIETY. 



9. Magnesium oxid (found in magnesium lime) has considerable 

 fungicidal value. Used alone it is not an especially good fungicide 

 for apples as it does not stick well. 



10. The value of the sediment in the lime-sulfur solution seems 

 to depend directly upon the magnesium oxid content. Mr. Wallace 

 found, by simple laboratory tests, that the sediment in the Niagara 

 Heavy Grade has about 50% as much fungicidal value per volume 

 as the clear solution. That is, the precipitate filtered out from the 

 clear solution thoroughly washed with clear water, and then diluted 

 at the rate of 2-30, when sprayed on Greening trees, gave approxi- 

 mately as large a percentage of fruit free from scab as did the clear 

 solution used at the rate of 1-30. 



11. Lead arsenate alone was found to have marked fungicidal 

 value, especially in the tests on the trees. This, Mr. Wallace 

 believes is due, to a large extent, to its spreading and sticking 

 qualities. 



August 5 and 6, 1910, at the summer meeting of the State Fruit 

 Growers' Association, over 1000 growers saw the results of these 

 experiments right on the trees in the orchards near Sodus, N. Y. 

 B. J. Case, President of the Fruit Growers' Association, in whose 

 orchards some of these experiments were conducted, declared that 

 if the fruit growers of that locality would retain Mr. Wallace, as 

 their local plant pathologist, he would save that town $50,000 the 

 next vear. 



Control of the Fire Blight in Nursery Stock. 



For many years nurserymen in central New York have lost more 

 or less heavily from fire blight in their blocks of pears, apples, 

 and quinces. By a cooperative arrangement with the Department 

 of Plant Pathology, in the spring of 1909, the C. W. Stuart and Co., 

 nurserymen, provided for one of our men to undertake the study 

 and control of this malady in their nurseries. The young man 

 had never seen a nursery before going on the job, but he had good 

 scientific training, the result of four years of conscientious work 

 in college preparing himself for the profession of plant pathologist. 

 He was given to understand that upon his efforts and results in 



