Volume:
3
Issue:
3
Date:
July 21, 2011
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent - 541-591-1255
Inside this issue:
Potato Crop Water Use
Early Planting
0.30
Crop Water Use
1
Insect Trap Report
2
Soil Degree Data
3
Brian’s Notes
4
inch/day
0.25
0.20
0.15
'99-'10 Avg
0.10
2011
0.05
0.00
5/15
6/15
7/15
8/15
9/15
Historical P-day Accumulation
June 1 -September 15
Potato Crop Water Use
Late Planting
0.30
inch/day
0.25
0.20
0.15
'99-'10 Avg
0.10
2011
0.05
720
700
680
660
640
620
600
580
560
540
520
NOAA
AgriMet
87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10
0.00
6/5 6/19 7/3 7/17 7/31 8/14 8/28 9/11 9/25
KBREC
Total P-Day Accumulation
Estimated Emergence - July 21
Inches
Planting Date:
Last 3 days:
Early
0.61
450
400
Late
0.46
Last 7 days:
1.28
0.94
Last 14 days:
2.81
1.89
Estimated Water Use:
350
300
p-days
Actual Water Use:
250
May 15
200
June 1
150
June 15
100
50
0
Next 7 days:
1.40
1.05
2007
2008
2009
2010
2011
Insect Trap Report
July 13 - July 20
Klamath County
TRAP
1
2
3
4
5
6
7
8
9
LOCATION
Township Rd
Casebeer Rd
Hwy. 39 - Henley
Hwy. 39 - Merrill
Anderson Rd.
Payger Rd.
N. Malin Rd.
Morelock Rd.
Spring Lake Rd.
PTW
0
0
0
0
0
0
0
0
0
BLH
0
0
1
0
1
0
0
0
0
OLH
2
0
2
5
3
1
7
2
1
PSY
0
0
0
0
0
0
0
0
0
0
N/A
0
0
0
0
1
N/A
1
0
0
0
2
N/A
8
0
2
2
0
N/A
0
0
0
0
Potato
0
0
2
1
1
0
14
3
0
5
5
GPA
1
0
0
0
4
0
1
0
0
1
2
Other
3
0
12
2
3
4
15
3
0
21
30
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
Modoc and Siskiyou
1
2
3
4
5
Co. Rd. 110
Frog Pond
S.W. Sump
Copic Bay
Co. Rd. 102
L. of Nations
Aphid Traps
1
2
3
4
5
6
7
8
9
10
11
Running Y
Lower Lake - North
Lower Lake - South
West Malin
Malin - Turkey Hill
East Malin
South Poe Valley
Bonanza
Yonna Valley
Henley
Henley
GPA: Green Peach Aphid
Soil Degree-Day Accumulation -- KBREC and IREC 2011
For Root-knot nematode control, Vydate applications should begin at 800 degree-days (DD5C).
To estimate that date, add the number of Total degree-days "Total" on the day you planted
to 800. Where that value occurs in the "Total" column estimates the date on which 800 DD5C
will occur in that field. It is recommended that applications continue every 14 days until harvest.
For Stubby-root nematode control, Vydate applications should begin at 0 degree-days (at planting)
and followed by an application at the first full irrigation following emergence. An additional
application is recommended at 800 degree-days (DD5C).
Contacts for Questions: Brian A. Charlton (541)883-4590 - office or (541)591-1255 - cell
Darrin Culp (541)883-7131 - office
KBREC DD5C IREC DD5C
Date
KBREC DD5C
Daily Total Daily Total Date
IREC DD5C
KBREC DD5C
IREC DD5C
KBREC DD5C
IREC DD5C
Daily Total Daily Total Date
Daily Total
Daily Total Date
Daily Total Daily Total
4/15/11 1.4
1.4
NA
NA
5/11/11
5.7
88.4
NA
NA
6/6/11
9.2
253.5
NA
NA
7/2/11
14.6
598.0 NA
NA
4/16/11 2.3
3.6
NA
NA
5/12/11
6.5
94.9
NA
NA
6/7/11
9.6
263.1
NA
NA
7/3/11
15.8
613.8 NA
NA
4/17/11 3.2
6.8
NA
NA
5/13/11
6.7
101.6 NA
NA
6/8/11
10.5
273.5
NA
NA
7/4/11
16.5
630.3 NA
NA
4/18/11 3.1
9.9
NA
NA
5/14/11
6.1
107.7 NA
NA
6/9/11
11.2
284.8
NA
NA
7/5/11
16.7
647.0 NA
NA
4/19/11 2.5
12.4
NA
NA
5/15/11
4.2
112.0 NA
NA
6/10/11
12.8
297.6
NA
NA
7/6/11
15.9
662.4 NA
NA
4/20/11 2.1
14.5
NA
NA
5/16/11
3.6
115.6 NA
NA
6/11/11
11.7
309.3
NA
NA
7/7/11
16.4
679.3 NA
NA
4/21/11 1.5
16.1
NA
NA
5/17/11
4.0
119.6 NA
NA
6/12/11
11.2
320.5
NA
NA
7/8/11
15.8
695.1 NA
NA
4/22/11 1.7
17.8
NA
NA
5/18/11
4.2
123.8 NA
NA
6/13/11
12.8
333.2
NA
NA
7/9/11
16.1
711.2 NA
NA
4/23/11 2.1
19.8
NA
NA
5/19/11
5.6
129.4 NA
NA
6/14/11
13.1
346.4
NA
NA
7/10/11
15.6
726.7 NA
NA
4/24/11 2.8
22.6
NA
NA
5/20/11
7.2
136.6 NA
NA
6/15/11
13.3
359.6
NA
NA
7/11/11
14.3
741.0 NA
NA
4/25/11 2.9
25.6
NA
NA
5/21/11
8.5
145.1 NA
NA
6/16/11
12.9
372.5
NA
NA
7/12/11
13.6
754.6 NA
NA
4/26/11 2.4
28.0
NA
NA
5/22/11
7.9
153.1 NA
NA
6/17/11
13.3
385.8
NA
NA
7/13/11
13.4
768.0 NA
NA
4/27/11 3.3
31.2
NA
NA
5/23/11
7.3
160.4 NA
NA
6/18/11
12.9
398.7
NA
NA
7/14/11
12.4
780.4 NA
NA
4/28/11 3.1
34.3
NA
NA
5/24/11
6.6
166.9 NA
NA
6/19/11
12.8
411.5
NA
NA
7/15/11
12.4
780.4 NA
NA
4/29/11 1.9
36.2
NA
NA
5/25/11
6.0
173.0 NA
NA
6/20/11
14.0
425.5
NA
NA
7/16/11
12.6
793.0 NA
NA
4/30/11 1.9
5/1/11 3.1
38.1
41.2
NA
NA
NA
NA
5/26/11
5/27/11
4.7
7.3
177.7 NA
185.0 NA
NA
NA
6/21/11
6/22/11
14.8
14.6
440.3
454.9
NA
NA
NA
NA
7/17/11
7/18/11
12.1
12.2
805.1 NA
817.3 NA
NA
NA
5/2/11
4.3
45.5
NA
NA
5/28/11
6.0
191.0 NA
NA
6/23/11
15.4
470.3
NA
NA
7/19/11
11.8
829.1 NA
NA
5/3/11
4.1
49.6
NA
NA
5/29/11
6.4
197.4 NA
NA
6/24/11
14.8
485.1
NA
NA
7/20/11
11.4
840.5 NA
NA
5/4/11
4.9
54.5
NA
NA
5/30/11
6.6
204.1 NA
NA
6/25/11
14.8
500.0
NA
NA
7/21/11
10.8
851.4 NA
NA
5/5/11
5.4
59.9
NA
NA
5/31/11
6.5
210.6 NA
NA
6/26/11
15.6
515.6
NA
NA
7/22/11
10.5
861.9 NA
NA
5/6/11
5.4
65.3
NA
NA
6/1/11
5.5
216.0 NA
NA
6/27/11
16.4
532.0
NA
NA
7/23/11
10.6
872.5 NA
NA
5/7/11
5.1
70.4
NA
NA
6/2/11
6.0
222.1 NA
NA
6/28/11
14.9
546.8
NA
NA
7/24/11
5/8/11
4.4
74.8
NA
NA
6/3/11
7.0
229.1 NA
NA
6/29/11
12.6
559.4
NA
NA
7/25/11
5/9/11
3.4
78.2
NA
NA
6/4/11
7.2
236.3 NA
NA
6/30/11
11.7
571.1
NA
NA
7/26/11
5/10/11 4.6
82.7
NA
NA
6/5/11
8.0
244.3 NA
NA
7/1/11
12.3
583.4
NA
NA
7/27/11
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Brian’s Notes
Insect Trap Reports: Aphid numbers in yellow pan traps are extremely low; however, look for these numbers to increase as
2nd hay cutting commences.
Soil Degree-Day Accumulation: Early planted potatoes (May 1 – May 7) have reached the 800 degree-day (5C) target. Potatoes planted in mid-May (May 15-20) are approximately 6 days away from the 800 degree-day target. Be sure to check
weekly as these values are updated.
P-day Accumulation: P-days are a measure of potato physiological growth from the time of emergence. Research data has
shown a strong correlation with 300 pdays and the onset of Early Blight. Potatoes which emerged close to May 15 have
reached this target. Those emerging around June 1 should reach this target in the next couple of days while those emerged
around June 15 are at least 12 days away. A preventative fungicide might be warranted if you routinely experience problems
with this disease as the target is getting close.
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591-1255
If you cannot reach Brian. Call - Darrin Culp, Fac. Res. Asst 541-539-0176