Volume: 5 Issue: 3 Date: July 12, 2013 Potato Bytes
Klamath Basin Research and Extension Center 6941 Washburn Way Klamath Falls, Oregon 97603 (tel)541‐883‐4590 (fax) 541‐883‐4596 h p://oregonstate.edu/dept/kbrec Brian A. Charlton, Research and Extension Agent ‐541‐591‐1255 0.35
0.30
0.25
0.20
'99‐'12 Avg
0.15
0.10
0.05
0.00
5/15
6/15
7/15
8/15
inch / day
Crop Water Use: 1 Soil Degree Data: 2 Insect Trap Report 3 Brian’s Notes 4 9/15
Potato Crop Water Use
Late Planting
Historical P-day Accumulation
June 1 -September 15
0.30
720
0.25
700
0.20
680
0.15
'99‐'12 Avg
660
0.10
2013
640
620
0.05
600
0.00
6/5
KBREC 7/5
8/5
99
9/5
Actual Water Use: Inches 400
Early Late Last 3 days: 0.85 0.69 Last 7 days: 2.01 1.58 Last 14 days: 3.79 Es mated Water Use: Next 7 days 1.94 2.85 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Total P-Day Accumulation
Estimated Emergence - July 11
Plan ng Date: Inside this Issue: 2013
1.55 300
p‐days
inch / day
Potato Crop Water Use
Early Planting
May 15
200
June 1
June 15
100
0
2009
2010
2011
2012
2013
Volume: 5 Issue: 3 Date: July 12, 2013 Potato Bytes
Klamath Basin Research and Extension Center 6941 Washburn Way Klamath Falls, Oregon 97603 (tel)541‐883‐4590 (fax) 541‐883‐4596 h p://oregonstate.edu/dept/kbrec Brian A. Charlton, Research and Extension Agent ‐541‐591‐1255 Soil Degree‐Day Accumula on ‐‐ KBREC and IREC 2013 For Root‐knot nematode control, Vydate applica ons should begin at 800 degree‐days (DD5C). To es mate 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 es mates the date on which 800 DD5C will occur in that field. It is recommended that applica ons con nue every 14 days un l harvest. For Stubby‐root nematode control, Vydate applica ons should begin at 0 degree‐days (at plan ng) and followed by an applica on at the first full irriga on following emergence. An addi onal applica on is recommended at 800 degree‐days (DD5C). Volume: 5 Issue: 3 Date: July 12, 2013 Potato Bytes
Klamath Basin Research and Extension Center 6941 Washburn Way Klamath Falls, Oregon 97603 (tel)541‐883‐4590 (fax) 541‐883‐4596 h p://oregonstate.edu/dept/kbrec Brian A. Charlton, Research and Extension Agent ‐541‐591‐1255 Insect Trap Report
July 1- July 8
Klamath County
TRAP
1
2
3
4
5
6
7
LOCATION
State Line & Wilson Rd
Highway 50
Pickett Road
Merrill Pit Road
Taylor Road
Lower Lake
Cross Road
8
9
10
Running Y
Reeder Road
PTW
0
0
0
0
0
0
0
0
0
BLH
0
0
1
0
0
1
0
0
2
OLH
13
22
18
8
22
19
10
8
14
PSY
0
2
0
0
0
0
0
0
0
Cheyne Road
0
0
11
1
0
0
0
0
0
1
0
0
0
23
35
9
23
14
0
1
0
0
0
Potato
1
2
5
7
9
1
6
2
1
8
1
GPA
0
0
0
0
0
1
0
0
1
0
0
OA
28
27
35
28
122
31
15
13
20
14
20
PP
0
0
0
0
0
0
0
0
0
0
0
OP
0
1
0
1
1
1
0
0
0
0
0
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
Modoc and Siskiyou
11
12
13
14
15
Road 112 Tulelake
Road 103 Tulelake
South Panhandle
Copic Bay
East West Road
Aphid Traps
1
2
3
4
5
6
7
8
9
10
11
Keno
Lower Lake West
Lower Lake East
East Malin
North Malin
South Poe Valley
East Bonanza
North Bonanza
East Yonna Valley
North Hildabrand
East Swan Lake
GPA: Green Peach Aphid
OA: Other Aphids
PP: Potato Psyllids
OP: Other Psyllids
Volume: 5 Issue: 3 Date: July 12, 2013 Potato Bytes
Klamath Basin Research and Extension Center 6941 Washburn Way Klamath Falls, Oregon 97603 (tel)541‐883‐4590 (fax) 541‐883‐4596 h p://oregonstate.edu/dept/kbrec Brian A. Charlton, Research and Extension Agent ‐541‐591‐1255 Crop Water Use: Irrigation frequency has accelerated with the onset of hot weather. Proper irrigation during such hot weather is
critical to minimizing internal tuber disorders – namely hollow heart and brown center. Growth cracks and secondary growth can
also be problematic during such hot weather. Check fields regularly as scheduling is likely to be more frequent than past weeks.
Insect Trap Reports: Insect pressure remains relatively low. Aphid numbers in yellow pan traps increased this past week. Expect
numbers to increase in the weeks to come as we typically see population spikes during mid-late July.
Psyllids: We have only found one potato psyllid this year. ‘Other psyllids’ have been caught but are not that abundant. Remember,
only potato psyllids transmit Liberibacter, the causal agent, of zebra chip.
Soil Degree-Day Accumulation: Potatoes planted around May 8 on muck soil and May 10 on mineral soil are just reaching the
800 degree-day (5C). Potatoes planted May 15 are about 4-6 days away from reaching this target. Remember, these values are derived from data loggers at KBREC and IREC and are likely different than temperatures in your own potato field. To optimize timing it is best to use temperatures from you own field.
P-day Accumulation: Potatoes which emerged around May 15 are approaching 300 p-days and control measures from Early
Blight and Brown Leaf Spot are advised for Russet Norkotah fields that are highly prone to infection.