DAIRY AND SEED IMPROVEMENT MEETINGS. 357 



little damage in our cool storehouses and northern climate, but 

 when our potatoes are shipped south for seed purposes, those 

 which are affected by silver scurf appear to dry out and deteri- 

 orate more rapidly than those which are not. Therefore, seed 

 not affected by this disease should be obtained if possible, as 

 none of the well-known disinfecting agents appear to have much 

 effect upon it. 



INTERNAL BROWN SPOT. 



Internal brown spot, which is characterized by rusty brown 

 specks or spots in the flesh of the potato and scattered promis- 

 cuously through it, is very rare in Maine, but more common in 

 certain western sections. It is non-parasitic, and there is no 

 direct evidence that the trouble is carried with the seed, although 

 on general principles potatoes so aft'ected should not be planted. 

 It is undoubtedly due to some defect in nutrition or environment 

 during the growing season, and is usually associated with dry 

 soils or dry seasons. 



ARSENICAL POISONING. 



The next picture shows a severe case of arsenical injurv 

 which is likely to occur when large quantities of paris green 

 were used without the addition of lime, while certain other 

 arsenical poisons produce the same result. The illustration is 

 taken from a photograph of a leaf sprayed with a compound 

 recently much advertised as being able to kill the bugs and act 

 as a tonic to the plant. It will be noted that the injuries on this 

 leaf are all surrounding punctures made by the flea-beetle. 



EARLY AND LATE BLIGHT. 



Early blight which is shown in the next two illustrations may 

 attack the plants at any stage of their growth, but frequently 

 occurs earlier than late blight. Late blight shows a preference 

 even for strong, vigorously-growing plants. Early blight is more 

 likely to attack those which are weakened by flea-beetle injury 

 or dry weather. It will be seen that early blight is more of 

 a spot disease, and while these spots may run together and cause 

 the death of the leaves, the individual ones are relatively small 



