Killing of Plant Tissue by Low Temperature 



201 



Kind of Buds 



Date 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Rice's Seedling peach 



Elberta peach 



Jonathan apple 



Montmorency cherry 

 Chabot plum 



Elberta peach 



Elberta peach 



Elberta peach 



Slowly to -I6.50 C. 



Mar. 24,'13i 145 



Mar. 24,' 13 

 Mar. 24,' 13 

 Mar. 24,'13 

 Mar. 24,'13 



170 



39 



166 



191 



57.0 

 82.9 

 46.2 

 76.5 

 100.0 



Slowly to -16" C. 



Nov. 3,'10 382 



Slowly to -I6.50 C. 



77.8 



Dec. 7, '11 150 



Dec. 7, '11 210 



1.3 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Rapidlyto-11.5 C. 



158 i 53.2 



86 I 75.5 



40 70.0 



189 1 59.2 



176 I 73.8 



Rapidly to-12.5C. 



188 69.1 



Rapidly to -16" C. 



200 



100.0 



Slowly to -16.20 C. jRapidlyto-16.5C. 



14.8 



150 



96.6 



Table 20a. Showing Effect of Slow and Rapid Temperature 

 Fall on Freezing to Death of Plant Tissue. 



Kind of Buds 



Manner 



of 

 Freezing 



Montmorency cherry ^Slowly to -20" C. . 



Montmorency cherry Rapidly to -20 C. 



Early Richmond cherry Slowly to -20" C 



Early Richmond cherry I Rapidly to -20" C. 



Date 



Mar. 2, '12 

 Feb. 29,'12 

 Mar. 9,'12 

 Mar. 14, '12 



Num- 

 ber 

 Buds 



163 

 130 

 297 

 263 



Percent- 

 age 

 Killed 



3.0 

 96.0 



5.0 

 98.0 



Table 20b. Showing Effect of Slow and Rapid Temperature 

 Fall on Freezing to Death of Plant Tissue. 



Kind of Buds 



Date 



Ben Davis apple I Jan. 



Ben Davis apple Jan. 



Ben I^avis apple iF"eb. 



Ben Davis apple. 

 Jonathan apple. . 



Feb. 

 Jan. 



Early Richmond cherry J^n- 



Early Richmond cherry 'Jan. 



Montmorency cherry ili*"- 



Early Richmond cherry Feb. 



Montmorency cherry JFcb. 



Cherry .Feb. 



18,'12 



19,'12 



2, "12 



3, '12 



18,'12 



18,'12 

 19,'12 

 19,'12 

 9,'12 

 10,'12 

 15, '12 



Tem- 

 pera- 

 ture 



Time 



-20.5 2 hrs 



-20.5 2 hrs 



-20 VAhrs... 

 -20 2K hrs... 

 -20.5 2 hrs 



-21 IHhrs... 



-20.5 2 hrs 



-20.5 IK hrs... 

 -20.5 IH hrs... 

 -20.5 \H hrs... 

 -20.5 12 hrs.... 

 I(slowly) 



Rapidly, -f 20 C. to -17" C. in 45 minutes 



Jonathan apple JFeb. 20,'13 



Vermont Beauty pear |Fcb. 20, '13 



Chabot plum iFcb. 20,'13 



Num- 

 ber 

 Buds 



40 

 47 

 60 

 82 

 35 



272 

 200 

 178 

 252 

 195 

 132 



20 

 25 

 28 



Percent- 

 age 

 Killed 



50.0 



36.2 

 0.0 

 2.44 



48.6 



98.6 

 100.0 



87.0 

 100.0 



94.8 



38.0 



100.0 



1 00 . 

 100.0 



