Wireworm Insecticide Experiments

Conducted at the John Sandahl (Kuhn-Binkley) Field
North of Emerson Nebraska, 2000

Conducted by:

 


Background information

Keith Jarvi
University of Nebraska
Northeast Research and Extension Center|
601 E Benjamin Avenue Suite 104
Norfolk NE 68701-0812
(402) 370-4016
e-mail: kjarvi1@unl.edu

Rainfall at Concord 2000
Species
Melanotus depressus (Melsh.)
Wireworm bait traps set 8 April, dug 21 April
Agronomic
Hybrid: Novartis 58D1
Row Spacing: 30 inches
Planting Date: 1 May
1 May John Deere Maxemerge, 2 row
Planting Depth: 2 inches
Application Equipment:

Granules at planting: Planter mounted cone-belt system, all in-furrow in front of press wheel

All liquids except Capture in a T-band: Microtube in-furrow in front of press wheel at 5 gallons solution/acre

Capture T band liquid formulation: 5 inch T band in front of press wheel at 5 gallons solution/acre

All liquids applied at 24 psi

Seed treatments were mixed with seed just prior to application
Previous Crop: No-till soybean
Tillage: Non
Field History: Corn-soybean rotation multiple years
Irrigation: None
Plot Direction: North-South
Plot length: 45 ft
Experimental Design and Evaluation
Randomized complete block with 4 replications, single row, no border rows between treatments

Ratings: Plant population in middle 30 ft of row

Plant populations were taken on 12, 15, 19, 24 may and 2 June

Statistical evaluation based on 12 May count. After that time ground squirrel damage seriously affected plant stands in several areas.

Comments: Wireworm traps in the plot area captured an average of 2 larvae per trap, considered to be above the economic threshold. This field has a long history of wireworm problems. A warm, dry spring with good growing conditions allowed the plants to germinate rapidly, unlike the last 4-5 previous years when cool wet weather delayed germination and allowed more time for wireworms to find the planted seed. Dead wireworms were observed on the surface of the ground during the taking of the stand counts. Lack of rain may have limited release of some of the granule materials. Nearest rainfall data is from Concord, NE, approximately 12 miles west of the field.

Wireworm Insecticide Screening Experiment
Emerson, Nebraska
2000
Application Methods:
TB = 5 inch T-band in front of press wheel at planting time
IF = In-furrow in front of press wheel at planting time
MT = Microtube at planting

Insecticide Screening Emerson, Nebraska, 2000
Plant Population per 30 ft of row (12 May) 1-2 leaf stage

 

Treatment

Application Method

Rate

Plant Population

Agrox Premiere Seed treatment 1.5 oz/42 lb of seed 32.25 a
Baythroid 2E IF MT 1.2 oz/acre 31.25 ab
Force 3 G IF 4 oz/1000 ft of row 31.25 ab
ProShield Seed treatment Pre-treated seed 30.25 abc
Pounce 3.2 EC IF MT 4 oz/acre 28.75 abcd
Kernel Guard Supreme and Maxim Seed treatment Pre-treated seed 28.75 abcd
Regent 4SC IF MT 4.2 oz/acre 28.00 abcd
Pounce 3.2 EC IF MT 2 oz/acre 28.00 abcd
Force 3 G IF 4 oz acre 27.50 abcd
Warrior T IF MT 1 oz/acre 27.50 abcd
Isotox Seed treatment 4 oz/100 lb of seed 27.00 abcde
Capture 2 E IF MT 0.15 oz/1000 ft of row 27.00 abcde
Adage Seed Treatment Pre-treated seed 26.75 abcde
Fortress 5 G IF 3 oz/1000 ft of row 26.50 bcde
Baythroid 2E IF MT 1.0 oz/acre 26.50 bcde
Counter 20 CR IF 3 oz/1000 ft of row 26.50 bcde
Regent 4 SC IF MT 2.1 oz/acre 26.00 bcde
Untreated

-

-

26.00 bcde
Counter 20 CR TB 6 oz/1000 ft of row 25.75 bcde
Capture 2 E TB 0.15 oz/1000 ft of row

25.50 cde

Maxim 4 FS Seed treatment Pre-treated seed 25.25 cde
Aztec 2.1 G IF 3.35 oz/1000 ft of row 25.25 cde
Fortress 5 G IF 1.5 oz/1000 ft of row 23.25 de
Counter 20 CR IF 6 oz/1000 ft of row 21.50 e

Means with the same letter are not significantly different. (LSD = 1.0332; alpha = 0.05)

Rainfall at the Haskell Ag Lab, Concord, NE

January 1 – July 14, 2000

Month Date Amount Month Date Amount
January 18 .133 February 7 .215
23 .429 23 .429
Total .644 Total .644
March 8 .290 April 4 .02
14 .101 7 .03
17 .184 15 .07
18 .155 16 .64
19 .02 20 .01
19 .123 25 .07
23 .292 26 .39
Total 1.145 27 .07
- 30 .01
May 7 .44 Total 1.31
8 .04
10 .01 July 1 .03
17 .68 2 .01
25 .59 4 .03
26 .67 5 .16
29 .94 10 .04
30 .12 11 .32
Total 5.49 14 .02
- Total .61
June 1 .14
3 .18
12 .42
13 .15
14 .01
15 .05
19 .29
20 .11
23 1.55
24 .08
25 2.37
27 .76
28 .08
29 .01
Total 6.20