Volume:
3
Issue:
1
Date:
July 7, 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
0.20
Potato Crop Water Use
Late Planting
0.30
0.25
inch/day
1
Insect Trap Report
2
Soil Degree Data
3
Brian’s Notes
4
Historical P-day Accumulation
June 1 -September 15
9/15
8/15
2011
7/15
0.00
6/15
0.10
'99-'10 Avg
5/15
inch/day
0.30
Crop Water Use
0.20
0.15
'99-'10 Avg
0.10
2011
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
0.05
0.00
6/5 6/19 7/3 7/17 7/31 8/14 8/28 9/11 9/25
Total P-Day Accumulation
Estimated Emergence - July 6
KBREC
350
Early
200
June 1
150
June 15
Last 3 days:
0.76
0.41
Last 7 days:
1.52
0.82
100
Last 14 days:
2.52
1.38
50
0
Estimated Water Use:
Next 7 days:
Ma y 15
250
Late
p-days
Planting Date:
300
Inches
Actual Water Use:
1.89
1.02
2007
2008
2009
2010
2011
Insect Trap Report
June 23 - July 6
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
NA
NA
NA
NA
NA
NA
NA
NA
NA
OLH
NA
NA
NA
NA
NA
NA
NA
NA
NA
PSY
NA
NA
NA
NA
NA
NA
NA
NA
NA
0
0
0
NA
0
0
0
0
0
NA
1
1
23
5
1
NA
0
1
0
0
0
NA
0
0
Potato
0
5
27
1
2
0
11
6
9
NA
NA
GPA
0
0
0
0
0
0
0
0
0
NA
NA
Other
4
1
37
2
2
2
8
3
3
NA
NA
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
15.3
662.4
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
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
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
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
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
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
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
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
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
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
38.1
NA
NA
5/26/11
4.7
177.7 NA
NA
6/21/11
14.8
440.3
NA
NA
7/17/11
3.1
41.2
NA
NA
5/27/11
7.3
185.0 NA
NA
6/22/11
14.6
454.9
NA
NA
7/18/11
5/1/11
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
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
General Information: I thought the 2010 growing season was quite unique; however, I’m starting to think 2011 wins
the prize. While we’ve not experienced as cold of daily low temperatures as 2010, our daily highs have been lower
than last year resulting in lower heat unit accumulation. As expected, early planted fields took considerably longer to
emerge than normal and crop development is considerably behind normal (if there is such a thing). However,
emerged potatoes appear to be growing quickly with the warmer temperatures – let’s just hope daily highs the
remainder of the season stays in the 80’s! I hope you find these issues of Potato Bytes in 2011 useful and remember
to contact me if you have suggestions for improvement.
Crop Water Use: Usage has definitely picked up with the warmer weather and more advanced crop growth. 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.
Insect Trap Reports: Sticky traps were placed throughout the Klamath Basin on June 27. Basin Fertilizer & Chemical
is graciously collecting them on a weekly basis. Overall insect pressure is relatively low. Aphid numbers in yellow pan
traps are somewhat variable and areas with higher numbers are likely close to recently cut hay fields.
Flea Beetles: As most of you are aware, Tuber Flea Beetle and/or Western Potato Flea Beetle have become resident
pests in the Henley area the past several years with pockets in the Malin area experiencing problems in 2009.
Potatoes that received a systemic insecticide should have ample protection during the early portion of the growing
season. However, thorough scouting is needed to verify if additional foliar sprays are warranted. Treatment
thresholds are very low (1 beetle per 60 plants). Scout field edges first, if counts exceed this threshold move further
into the field and repeat. Doing so will determine if aerial applications are warranted for the entire field or can be
targeted to field edges only. REMEMBER – shot hole damage on lambsquater weed is not a good indicator that an
aerial application is warranted. Tuber / Western Potato Flea Beetles prefer to feed on potatoes and are rarely
observed on non-Solanaceous weeds. Damage to lambsquarter is most likely the result of Crucifer Flea Beetle which
poses no risk to potatoes. Feel free to call me for a field visit if needed.
Soil Degree-Day Accumulation: Values are well behind the prior 5-year average which is not surprising considering
cool air temperatures this spring and early summer. Expect the 800 degree-day (5C) target to be reached later in July
than normal. A ballpark guess given current daily accumulation is early planted potatoes (May 1 – May 7) are likely to
reach the 800 DD target around July 18 – 20. 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. Early
emerged potatoes have not quite reached this target but should in the next 10-12 days. A preventative fungicide might
be warranted if you routinely experience problems with this disease as the target is getting close.
Other: Late Blight was recently confirmed north of Pasco (Columbia Basin) on June 21st. It is assumed the infection
likely originated from an infected seed lot; however, further investigation is continuing. While the Klamath Basin has
escaped issues with this disease during the last decade, it remains a threat and preventative methods continue to be
necessary to disrupt the disease triangle. Be cognizant of your irrigation schedule to prevent periods of excessive
moisture in the lower canopy. Night irrigations not only take advantage of reduced wind which improves distribution
uniformity but allows for better canopy drying during the day. Continue to aggressively scout fields in wet areas for
infection and bring suspect samples in for confirmation. TAKE CARE OF CULL PILES!!
Shortages of Russet Norkotah seed forced several growers to experiment with newer varieties from the Tri-State
Program – namely Classic Russet. I presented information on cultural management of this variety during our winter
Klamath Basin Potato Seminar. If you did not receive this information please let me know and I can email or fax the
guidelines. Lastly, do not hesitate to call me with questions and I’m more than willing to travel for a field visit if
necessary.
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