2,9- AGRICULTURE OF MAINE. 



periments and in some of the others mentioned the trees used 

 were not those which are particularly susceptible to bordeaux 

 injury, and while the results are of value as showing the fungi- 

 cidal value of lime-sulphur, they do not show that it would not 

 produce spray injury on the more tender varieties. Much more 

 experimentation will be necessary to determine this point ; hence 

 it is impossible at this time to state with any degree of accuracy 

 what may be expected from the lime-sulphur sprays in the line 

 of spray injury. However, there is every reason to believe that 

 it may be used on the more tender varieties with much less dan- 

 ger of injury than with bordeaux mixture. It is probable that 

 the combined use of the two would yield the more satisfactory 

 results. That is, for the more tender varieties, use bordeaux 

 mixture for the first spraying, in the spring before thp leaves 

 unfold, followed with lime-sulphur for the later sprayings. 



Baldwin spot. The disease which is generally knoAvn in 

 ]\Iaine under this name is not of fungus origin. It takes its 

 name from the fact that it was first observed on and occurs most 

 commonly on Baldwin apples, but it is not confined to that 

 variety. 



This disease is characterized by sunken spots distributed irreg- 

 ularly over the surface of the apple, as shown in Fig. 6i. These 

 spots are somewhat hemispherical in shape. They vary in size 

 from one-eighth to one-fourth inch in diameter and have very 

 much the appearance of bruises. An examination of the tissues 

 beneath shows that they are brown in color and have become 

 somewhat dry and spongy. In some cases the Baldwin spot 

 appears on apples as they are ripening but in other cases it 

 develops in storage. It may be confined to individual trees in 

 an orchard or to certain branches of a tree. 



In late stages the tissues beneath the spots become shrunken 

 so that the pitting is deeper. The brown coloring is not con- 

 ■ fined to the region just beneath the spot but is found also in the 

 tissues surrounding the vascular bundles in later stages. 



This disease should not be confused with the spot of apples 

 caused by the fungus Cylindrosporiiim pomi Brooks, see page 

 398. The fungous disease can be controlled by spraying but 

 the Baldwin spot cannot be controlled by that means. The 

 writers believe that confusion of these two spots of apples in 

 the past is responsible for reports which have been made of the 



