APS_Jan2023

J ournal of the A merican P omological S ociety

54

2020

35

2

Total Precipitation

Maximum Air Temperature

30

1.8

Minimum Air Temperature

25

1.6

20

1.4

15

1.2

Precipitation (cm)

10

1

5

0.8

Temperature (°C)

0

0.6

-5

0.4

-10

0.2

-15

0

2 Jan

12 Jan 14 Feb

24 Feb 6 Nov

16 Nov

2020

402 F igure 1. Minimum and maximum daily air temperatures and precipitation for the 10-day 403 period preceding the January, February, and November sample collection dates in 2020. 404 2021 Figure 1. Minimum and maximum daily air temperatures and precipitation for the 10-day period preceding the January, February, and November sample collection dates in 2020.

10 15 20 25 30 35

3.5

Total Precipitation

Maximum Air Temperature

Minimum Air Temperature

3

2.5

Precipitation (cm)

2

1.5

0 5

Temperature (°C)

1

0.5

-10 -5

0

1 Jan

11 Jan

15 Nov

1 Mar

19 Feb

5 Nov

2021

405 Figure 2. Minimum and maximum daily air temperatures and precipitation for the 10-day 406 period preceding the January, March, and November sample collection dates in 2021. 407 Figure 2. Minimu and maximum daily air temperatures and precipitation for the 10-day period preceding the January, March, and November sample collection dates in 2021.

Floral bud cold hardiness. In Jan. 2020, flower buds of trees on Lovell rootstock had lower T 50 values than those of trees on all other rootstocks, except ‘MP-29’, ‘Control

ler™ 7’, and Controller™ 6’ (Table 2). At the late February collection date, T 50 values of flower buds from trees on Lovell rootstock were 2.1 to 4.3 °C lower than those from