Some Tinel y In formation on Ap-ple Sca b. (Data compiled by 0. G. Boyd shov;ing tine 

 required for appearance of spots on leaves , length of v/et p eriod necessary for 

 infection of fruit, and time interval between late season infection and appearance 

 °^ scat) in storage. 



Obs ervations i n Amlierst - 1940 



Length of v/et Spots appeared on 

 Date of rain Bud Stap;e period Leaves 



May 4 Pre-Prepink 12-15 hrs. I.'ay 22-23 (Light infection) 



Ix!.y 16, 17 Late Pink 30 hrs. J.iay 30-June 1 (light infec- 



tion) 

 (liay 19, 20 - Warm period with rapid grov/th) 



May 21-29 Early Bloom- 9 days June 3-12 (Heaviest infec- 



lay 31 (2.6") Calyx tion occurred during latter 



part of wet period) 



June 9-12 Between 1st and 



2nd Cover 40 hrs. June 20-23 



June 24-26 Between 2nd and 3 days (Most foliage infection shows 



3rd Cover up in 8-10 days during June 



July 3,4 26 hrs. ajid July) 



July 11, 12 



Apple Scab Ino c ulat ion on Mcintosh Apples 

 7J-563 5 



(From lUSoD.A. Tech. BulT'ffbe'd :> 1937c Work Done in Hudson Valley) 



D ate of Rain Length of Wet Period Scab Appeared 



Date Days after 

 June 28) 



July 7 ) 28 hrs. 



Aug. 15 ) 



Aug. 18 44 hrs. — - 



Aug. 16 51 hrs. — 



Aug. 18 92 hrs. Sept. 20 33 (at harvest) 



Aug. 12 40 hrs. Oct. 13 62 (49 days in 



orchard, 13 days 

 at 32°F.) 

 Aug. 12 76 hrs. Sept. 20 39 (at harvest) 



Aug. 12 96 hrs. Sept. 12 31 



Aug. 24 72 hrs. 



Aug. 27 9.5 days Oct. 13 47 (34 days in 



orchard , 13 days 

 at 32° F.) 

 Sept. 13 8 days May 1 7-|- ;::■ c.(8 days in 



orchard; 6-j months 

 £ 32°F., and 30 

 days G 40° F.) 

 Sept. 22 7 days April 1 6^- mos. (2 32° Fo) 



Sept. 7 48 hrs. 



Sept. 7 95 hrs. Mar. 22 6iraoS.(.G32 F.) 



