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01
Aug
2014
Arkansas Corn and Grain Sorghum Weekly Update – August 1, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

Corn and Grain Sorghum Research Verification – Kevin Lawson (Corn & GS Verification Coordinator)

The majority of the verification corn fields have reached irrigation termination.  Arkansas, Lee, Lonoke, and White counties have had irrigation terminated.   Clay County probably has 3 more irrigations before it is done.  Jefferson County needs one more irrigation on Monday and it will be finished.  Mississippi and St Francis Counties are pivot irrigated, so I want them both to go next week, then we will be done.

The Chicot County grain sorghum field has finished irrigation. We will look at it Monday and decide on a desiccant application and get ready for harvest.  Prairie County still has a ways to go before maturity.  Headworms are reaching threshold and we found sugarcane aphids this week.  We will look again Monday and decide on an insecticide application.

County

Hybrid

Growth Stage

Weekly Rain

Comments

———-Corn———-
Arkansas DKC64-69 VT3P

R5.7

0.30

Field was irrigated on July 26.  Recommended irrigation termination.  (Scouted July 31)
Clay DKC64-83 VT3P

R4

1.10

Field was irrigated on July 27.  Recommended irrigation on August 3.  (Scouted July 29)
Jefferson DKC62-08 SS

R5.5

0.30

Recommended irrigation on August 4 then terminate irrigation.  (Scouted July 31)
Lee DKC66-87 VT2P

R5.6

0.00

Irrigated on July 28.  Recommended irrigation termination.  (Scouted July 30)
Lonoke Armor 1330

R5.6

0.25

Irrigated on July 29.  Recommended irrigation termination.  (Scouted July 31)
Mississippi Pioneer 2089YHR

R5.6

0.60

Field was irrigated on July 28.  Recommended irrigation on August 3 then terminate irrigation. (Scouted July 29)
St Francis Terral 26BHR50

R5.6

0.00

R5.6 Irrigated on July 26.  Recommended irrigation on August 2.  (Scouted July 30)
White Armor 1550PRO

R5.7

0.00

Irrigated on July 28. Recommended irrigation termination.  (Scouted July 30)

———–Grain Sorghum———-

Chicot Dyna-Gro 765B

Mature

0.00

Field continues to dry down for harvest.  (Scouted July 30)
Prairie Pioneer 84P80

Soft Dough

0.40

0.75 headworms per head and sugarcane aphids.  Recommended scouting again August 4.  (Scouted July 30)

Average CRVP Growth and Development vs. 2014 CRVP.

Corn Stages

5 Year Avg CRVP Days to Stages

2014 Avg CRVP Days to Stages

5 Year Avg CRVP Height (in)

2014 Avg CRVP Height (in)

Avg CRVP Heat Units (2012 – 2013)

Avg CRVP Heat Units 2014

Planting

0

0 0 0

VE

10

10 0 0 145

150

V2

18

17 3 2 251

266

V4

28

26 6 5 425

463

V6

37

36 12 12 612

633

V8

45

43 22 19 791

798

V10

51

48 36 34 922

938

V12

56

53 52 49 1036

1078

V14

61

58 67 61 1155

1197

V16

65

63 82 73 1256

1308

R1

72

70 106 102 1452

1519

R2

78

76 115 112 1615

1683

R3

84

82 115 112 1811

1842

R4

91

89 115 112 2005

2020

R5

98

97 115 112 2199

2195

R6

122

  115 112 2919

 

Harvest

145

  115 112

 

Southeast Arkansas Update – Wes Kirkpatrick (Desha County) & Kevin Norton (Ashley County)

We’re picking up the poly pipe on a bunch of acres. Most of the rest is getting watered for the last time. Limited harvest will probably begin in 2-3 weeks.

Central Arkansas Update – Brent Griffin (Prairie County)

Corn earworm populations continue to increase in maturing grain sorghum and a few fields were treated.  Sugarcane aphid was discovered in the grain sorghum verification field. Majority of the corn is or will be receiving the final irrigation as it approaches black layer. Corn earworm moths have been noticed in soybean fields adjoining corn fields. Pollination issues have becoming apparent in a few corn fields. 

Northeast Arkansas Update – Herb Ginn (Lawrence County) & Branon Thiesse (Craighead County)

Craighead County – Most fields are in dent with starch forming in early fields. These early fields will be evaluated for irrigation termination in the next two weeks. At this time disease pressure is light. Irrigation continues with light rain forecasted for the next couple of days. Grain sorghum is starting to turn colors. Moth counts are low at this time.

Lawrence County – We now have some corn at black layer with other fields a little ways behind.  We did get a little rain Wednesday, but not enough to really stop irrigation on those fields that are not at cutoff.  I have been getting some calls on late planted grain sorghum regarding whorl damage due to feeding, but it does not appear that these fields will have to be sprayed as we are not at threshold.

River Valley Update – Kevin VanPelt (Conway County) & Hank Chaney (Faulkner County) 

Some fields have been estimated to have up to 20% green snap since the last storms. We’re seeing southern rust in more fields, but the corn is far enough along in those that it shouldn’t have an effect on yields. The later planted corn may need irrigated once more next week, but for the largest part most fields are done. 

Heat Units 

Heat units continue to be below 30 year averages.  Early planted fields should be at R6 (black layer).

 Region of the state (city)

Heat Units Accumulated July 26 – Aug 1

30 Year Average Heat Units July 26 – Aug 1

Total Heat Units Since March 9

30 Year Average Heat Units Since March 9

Southeast Arkansas (McGehee, AR)

177

200

2,929

3,036

Central Arkansas (Des Arc, AR)

181

204

2,718

2,938

Northeast Arkansas (Jonesboro, AR)

173

196

2,692

2,703

River Valley (Morrilton, AR)

175

193

2,810

2,710


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