Volume:
3
Issue:
2
Date:
July 14, 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:
inch/day
Potato Crop Water Use
Early Planting
Crop Water Use
1
0.30
Insect Trap Report
2
0.25
Soil Degree Data
3
Brian’s Notes
4
0.20
0.15
'99-'10 Avg
0.10
2011
0.05
0.00
5/15
6/15
7/15
8/15
Historical P-day Accumulation
June 1 -September 15
9/15
0.30
0.25
inch/day
NOAA
pp-days
-days
Potato Crop Water Use
Late Planting
720
700
680
660
640
620
600
580
560
540
520
0.20
0.15
'99-'10 Avg
0.10
2011
0.05
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
Inches
Early
Late
Last 3 days:
0.57
0.38
Last 7 days:
1.53
0.95
Last 14 days:
3.13
1.82
1.33
.88
Estimated Water Use:
Next 7 days:
400
350
300
p-days
Actual Water Use:
Planting Date:
Total P-Day Accumulation
Estimated E mergence - July 14
May 15
250
200
150
100
50
0
June 1
June 15
2007
2008
2009
2010
2011
Insect Trap Report
July 6 - July 13
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
0
1
0
0
0
OLH
3
1
10
1
1
5
3
2
0
PSY
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
2
2
1
0
2
0
0
0
0
0
0
Potato
2
3
11
3
4
4
6
3
1
13
3
GPA
0
1
1
0
0
1
0
0
0
1
0
Other
5
11
23
21
8
6
14
4
6
12
17
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
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
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
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
5/2/11
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
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
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
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
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
Crop Water Use: ET values are on the rise as temperatures move upwards; however, overall usage for both early and late
planted potatoes lags behind the prior 10-yr average as heat unit accumulation is considerably lower. When feasible, look to
irrigate in the evening or at night to take advantage of reduced wind which will improve distribution uniformity and facilitate
better canopy drying during the day. Be cognizant with this approach during periods of cooler than normal day temperatures
which will slow canopy drying and provide an environment more conducive to fungal infection.
Insect Trap Reports: Aphid numbers in yellow pan traps remain somewhat variable. Look for these numbers to increase as
2nd hay cutting commences.
Soil Degree-Day Accumulation: Early planted potatoes (May 1 – May 7) should reach the 800 degree-day (5C) target in the
next 5 days. Potatoes planted in mid-May are approximately 10 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. Early planted potatoes which emerged around May 15 are approximately 19 days behind the prior 5-year average. Potatoes emerging around
June 1are 5 days behind the prior 5-year average while those emerging around June 15 are only 2 days behind. Research data
has shown a strong correlation with 300 pdays and the onset of Early Blight. Potatoes which emerged close to May 15 should
reach this target in the next 5 days; those emerging around June 1 should reach this target in the next 9 days while those
emerged around June 15 are at least 2 weeks 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