Recent Avipel activity

Hey, we are still working hard to obtain a section 18 for Avipel . Please help us gather some of the data EPA wants so that we can get a Section 18 for Avipel for the 2012 season. All you have to do is contact Kelly answering these 3 questions:

1) How many acres of corn or rice were damaged by birds?

2) What impact do you think they had on your yield?

3) Did you replant?

These data will be helpful in fulfilling the EPA’s requirements for additional data so that we have the product available for 2012. We also submitted the information below to help the EPA understand the need we have for protecting our germinating corn and rice:

A Christmas Bird Count (CBC) is conducted on a 15 mile diameter circle, or an area of 176.7 square miles. Below you will find CBC data for Red-winged Blackbirds and Common Grackles in Missouri. If we assume that the Missouri CBC are representative of the entire state we can estimate populations at the time of the CBC. During the 111th CBC 29 count circles were performed that were had at least some portion of the count circle in Missouri, or slightly less than 5124 square miles of Missouri were sampled. Being as Missouri has an area of 69,704 square miles, a multiplier of 13.6 (69,704/5124 = multiplier) yeilds a rough estimate of statewide population.  

 The estimates derived from this rough approach do not cause us to reject Dolbeer (1978).  Dolbeer (1978) demonstrated via band returns that Red-winged Blackbirds are migratory and large populations overwinter in the southern US. In the table excerpted below Missouri is in regions 9 and 10. The larger overwintering populations to the south of Missouri migrate north through Missouri.

 

TABLE 7
Ranking of 13 regions in North America as to banding and recovery effort for Red- winged Blackbirds during winter-roost period, 10 December-20 February. Only regions containing at least 200,000 winter-roosting Red-wings are included in the analysis.
 

Banding effort

 

Recovery effort

Estimated

 

No.

 

Region

roosting p.opula-uon of Red-wings1 ( x 10 6) [A]

No. birds banded in region that have been recovered [B]

Bandingeffort index [B/A]

Rank

banded birds re- covered in re- gion [C]

Recoveryeffort index [C/A]

Rank

2

3.87

117

30.23

1

195

50.39

1

3

12.49

17

1.36

7

35

2.80

8

4

41.93

129

3.07

5

159

3.79

7

5

54.38

12

0.22

12

46

0.85

12

6

1.15

8

6.98

4

8

6.96

6

7

10.05

3

0.30

11

116

11.54

4

8

1.37

1

0.73

9

15

10.96

5

9

19.97

0

0.00

13

17

0.85

11

10

20.95

29

1.38

6

13

0.62

13

11

13.28

6

0.45

10

13

0.98

10

12

5.25

93

17.71

3

98

18.67

2

13

0.24

5

20.83

2

4

16.67

3

14

4.32

5

1.16

8

12

2.78

9

1 Meanley, B. 1976. Unpubl. Prog. Rep., Work Units P-F-25.1, 25.2. Patuxent Wildl. Res. Center, Laurel, MD. 82p.
                 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Red-winged Blackbird spring migration occurs from mid-Feb through mid-May (Dolbeer 1982). Spring migration of Common Grackles is usually over by mid-Apr throughout most of its range (Dolbeer 1982, Robbins 1992). Common Grackles are also the most important species involved in damaging sprouting corn, a multimillion dollar problem annually (Stone and Mott 1973). Our observations in Missouri are that large, migrating blackbird flocks coincide with optimal sprouting times for rice and corn and can create situations where stand is reduced to the point that replanting is necessary.

 REFERENCES

 Dolbeer, R. A. 1978. Movement and migration patterns of Red-winged Blackbirds: a continental overview. 49:17-34.

 Dolbeer, R. A. 1982. Migration patterns for sex and age classes of blackbirds and starlings. J. Field Ornithol. 53:28-46.

 National Audubon Society (2010). The Christmas Bird Count Historical Results [Online]. Available http://www.christmasbirdcount.org [7 October 2011]

 Robbins, M. B. 1992. Birds of Missouri: their distribution and abundance. Univ. of Missouri Press, Columbia.

 Stone, C. P. and D. F. Mott. 1973. Bird damage to sprouting corn in the United States. U.S. Fish Wildl. Serv. Spec. Sci. Rep. Wildl. 173

Observation data for Red-winged Blackbird, Common Grackle, blackbird sp., in US-MO,
Count Years: 93 – 110

 

 

Red-winged Blackbird
(Agelaius phoeniceus)

Count Number

Number

Number / Party Hr.

Number of Counts
Reporting Species

Number of
Observers on
Reporting Counts


 

110 ( 2009-10)

82087

69.7463

25

455

109 ( 2008-9)

47416

47.7408

23

427

108 ( 2007-8)

33814

28.1671

24

416

107 ( 2006-7)

63522

56.1408

25

470

106 ( 2005-6)

23188

23.2153

23

431

105 ( 2004-5)

508994

425.7036

24

381

104 ( 2003-4)

244332

230.4695

26

452

103 ( 2002-3)

33512

28.7842

26

423

102 ( 2001-2)

243392

240.2906

23

393

101 ( 2000-1)

26995

27.536

22

330

100 ( 1999-2000)

27451

17.6742

21

294

99 ( 1998-9)

238478

143.8239

20

299

98 ( 1997-8)

61592

79.2802

21

318

97 ( 1996-7)

14543

12.3301

22

364

96 ( 1995-6)

16561

19.1941

20

317

95 ( 1994-5)

24552

18.9696

22

356

94 ( 1993-4)

19760

19.5601

21

273

93 ( 1992-3)

11059

9.9098

20

290


 

 

Common Grackle
(Quiscalus quiscula)

Count Number

Number

Number / Party Hr.

Number of Counts
Reporting Species

Number of
Observers on
Reporting Counts


 

110 ( 2009-10)

88207

77.3101

25

444

109 ( 2008-9)

159853

141.2482

23

424

108 ( 2007-8)

17140

15.2686

20

345

107 ( 2006-7)

13595

7.1012

24

449

106 ( 2005-6)

1096723

1169.206

23

445

105 ( 2004-5)

164121

129.4332

19

328

104 ( 2003-4)

478765

445.1405

22

417

103 ( 2002-3)

9691

3.8325

18

318

102 ( 2001-2)

113739

106.5214

22

389

101 ( 2000-1)

4323

4.4132

21

322

100 ( 1999-2000)

6855

5.2757

22

375

99 ( 1998-9)

171313

76.1784

17

269

98 ( 1997-8)

68557

56.6986

20

280

97 ( 1996-7)

1562

1.4778

16

269

96 ( 1995-6)

30192

37.0637

18

278

95 ( 1994-5)

12820

6.7803

18

311

94 ( 1993-4)

304056

248.0401

20

308

93 ( 1992-3)

32441

22.7294

21

295

Source: National Audubon Society (2010). The Christmas Bird Count Historical Results [Online]. Available http://www.christmasbirdcount.org [7 October 2011]



Categories: Rice

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