Frost and the Prevention of Damage by It. 



17 



heavy crops both years and the yield of near-by trees that were not 

 smudged was not noticeably larger. (See figure 5.) 



FIG. 5. Fine crop of perfectly shaped Bartlett pears on tree used in experiments to 

 determine the effect of smudging on pollination. This tree was smudged heavily every 

 night from the time the buds began to open until the fruit had set. Photograph taken 

 soon after spraying. 



Statements that bees will not work in blossoms that have been 

 smudged may be due to a lack of understanding of the habits of the 



