MAINE ArPLE DISEASES. 355 



before.* From information collected since publishing the ac- 

 count above referred to, it would seem that the appearance and 

 spread of apple scab in storage is by no means uncommon in 

 eastern States but in the past it has been largely overlooked. 



Apple scab in storage may develop on fruit which, when ]:)laced 

 in the cellar, appeared entirely free from the disease. It differs 

 in appearance from the spots formed out-of-doors so much that 

 at first one is doubtful as to the identity of the two diseases. 

 Cultures made from the storage developed spots settled this point 

 beyond doubt. Instead of soon breaking out and producing 

 olive-colored summer spores the fungus usually remains be- 

 neath the unruptured cuticle, and the diseased portions appear 

 as slightly sunken, small, black, somewhat shiny spots. As ob- 

 served in Maine these storage developed spots have always been 

 much smaller than those produced out-of-doors. Many of them 

 are only of pin-head size. Brooks, however, has shown that 

 they may attain a much larger size.** Fig. 246 shows the char- 

 acteristic development of apple scab in storage. Doubtless much 

 of the infection takes place immediately before or at the time 

 of picking, but in one instance, at least, observed during the past 

 winter, the evidence plainly indicated spread in storage. In a 

 box of very clean No. i Mcintosh, packed for perfect apples, 

 one bearing a medium sized scab spot covered with spores was 

 placed by accident. This box was placed in a relatively cool but 

 quite moist cellar and when opened by one of us in mid-winter 

 several apples lying immediately below the summer-scabbed ap- 

 ple were covered with the small black spots above described. 

 The remainder of the fruit in the box was without blemish of 

 any kinrl 



Directions for the control of apple scab by spraying will be 

 found on p. 390. Fruit from trees that are well sprayed will 

 be less likely to develop the disease in storage. Scabby api)les 

 should be carefully sorted from the sound before storing. The 

 temperature of storage should be as low as consistent with safe- 

 ty and not subject to abrupt changes. Very moist storage con- 

 ditions should be avoided. 



* Carman. H. Ky. Exp. Sta. Rep. 2. p. 48. iSSo. 

 McCarthy, Cerald. N. C. Exp. Sta. Bui. t,2. p. S8. 1893. 

 Henderson, L. F. Idaho Exp. Sta. Bui. 20, p. 83, 1899. 



** Brooks, Chas. N. H. Exp. Sta. Bui. 144, p. 113, 1909. 



