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11
Jul
2014
Arkansas Corn and Grain Sorghum Weekly Update – July 11, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

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

Irrigations on corn fields continue in between rain showers.  Several producers have commented on how they will begin irrigation but have stopped because it rained.  We continue to scout for disease, but everything is clean.

White sugarcane aphids have been found on the Chicot grain sorghum field.  We continue to watch them hoping that natural predators take out the population.  They are located low on the plants, but by Monday (July 14) if they are still present we will apply Transform insecticide.  The grain sorghum field in Prairie County is flowering and midge was found on most plants and we recommend an insecticide application.

County

Hybrid

Growth Stage

Weekly Rain

Comments

———-Corn———-

Arkansas DKC64-69 VT3P

R3

0.30

Field looks good.  Continue to irrigate. (Scouted July 11)
Clay DKC64-83 VT3P

V17

0.25

Started irrigation but stopped due to rain.  Continue to irrigate.  (Scouted July 8)
Jefferson DKC62-08 SS

R3

0.00

Irrigated on July 7. (Scouted July 7)
Lee DKC66-87 VT2P

R3

0.00

Irrigated on July 5. (Scouted July 8)
Lonoke Armor 1330

R4

0.90

Irrigated on July 5.
Mississippi Pioneer 2089YHR

R3

0.00

Continue to irrigate. (Scouted July 8)
St Francis Terral 26BHR50

R4

0.00

Continue to irrigate. (Scouted July 8)
White Armor 1550PRO

R4

0.40

Irrigated on July 8. (Scouted July 9)

———–Grain Sorghum———-

Chicot Dyna-Gro 765B

Soft Dough

0.00

Irrigated on July 4.  Applied Dimethoate on July 5 for midge.  (Scouted July 7)
Prairie Pioneer 84P80

Flower

0.40

Recommended midge spray. (Scouted July 9)

 

 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

71 106 102 1452

1510

R2

78

77 115 112 1615

1678

R3

84

83 115 112 1811

1838

R4

91

89 115 112 2005

1947

R5

98

  115   2199

 

R6

122

  115   2919

 

Harvest

145

  115  

 

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

Irrigation is the only major thing happening in corn.  There is a little common rust showing up in some areas.  Several acres are reaching the dent stage.

Central Arkansas Update – Brent Griffin (Prairie County)

Irrigation has resumed. Some pollination issues are being found. Sorghum midge is being found in heading sorghum

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

Craighead County – Irrigations continue county wide. Corn borer traps in the eastern side of the county have indicated little to no moth activity for the entire season. We have been catching steady numbers of corn earworm moths that could be a threat to our non Bt corn (refuge).

Lawrence County – More rain this week, but we did not receive enough rain to prevent irrigation of corn.  Overall the corn crop is doing fairly well with many fields at the milk stage and some just starting into the dough stage. Some grain sorghum fields are fully headed and others are not far behind.

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

Timely rainfall helped both dryland and irrigated fields this week. Rainfall amounts varied from 1.5 to 3.0 inches. No major diseases have been observed this week.  Grain sorghum is heading erratic and needs to be closely monitored for midge and corn earworms infestation.  

Heat Units

The following heat units are for the last two weeks.  We were a little below the 30 year average as we have experienced cooler temperatures.

 Region of the state(city)

Heat Units Accumulated June 28 – July 11

30 Year Average Heat Units June 28 – July 11

Total Heat Units Since March 9

30 Year Average Heat Units Since March 9

Southeast Arkansas (McGehee, AR)

391

400

2,401

2,447

Central Arkansas (Des Arc, AR)

377

409

2,200

2,341

Northeast Arkansas (Jonesboro, AR)

373

388

2,181

2,136

River Valley (Morrilton, AR)

384

385

2,292

2,151


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