2002 Nebraska Insecticide Evaluations

Researcher(s): Keith Jarvi

Location: Dean Eckstrom field north of McLean, Nebraska

Evaluation: White Grub treatment (Bayer)

Species: Still to be identified

	Hybrid	Novartis 58D1
	Row Spacing	30 inches
	Planting Date	6 May
	Planter	John Deere MaxEmerge®, 2 row
	Planting Depth	2 inches
	Planting Rate:
	Application Equipment	Aztec 2.1 G granules at planting: Planter mounted cone-belt system, in-furrow in front of press wheel Leverage 2.7 SE applied with microtube in-furrow in front of press wheel at 5 gallons solution/acre, 24 psi Seed treatments were applied by Bayer on N58D1 and sent to us.
	Field Preparation	Disk once previous to planting
	Fertilization
	Herbicides
	Cultivation
	Previous Crop	2001 corn replanted to soybean due to extensive stand loss
	Soil Type
	Organic Matter
	ph
	Field History	Corn-soybean rotation multiple years
	Irrigation	None
	Plot Direction	East-West
	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 7, 10, 14, 17 and 25 June

Statistical evaluation based on 25 June count.

Comments: A 15 acre area of this field was nearly 100% destroyed by white grubs in 2001. Soybeans were replanted in the area in June of 2001 and were not damaged by the grubs. Enough grubs were left in 2002 to give us a good screening experiment. Stunting occurred throughout the rating period and yield will be taken in October. No phytotoxic symptoms were present, except those caused by the grubs (stunting and purpling caused by lack of root system). Rainfall was not recorded but virtually no rain fell during the planting to recording period. All treatments were significantly better than the untreated check and there were no significant differences between treatments.

Application Methods:

ST = Seed Treatment

IF = In-furrow in front of press wheel at planting time

MT = Microtube at planting

Insecticide Screening McLean, NE 2002

Plant Population per 30 ft of row (25 June)

Treatment	Application Method	Rate	Plant Population
LO263	ST	0.08 ke	37.25 a
Clothianidin	ST	0.25 ke	37.25 a
Leverage 2.7 SE	IF MT	2.5 fl. oz./1000 ft of row	35.50 a
Aztec 2.1 G	IF	5.025 oz/1000 ft of row	35.50 a
LO263	ST	0.125 ke	35.25 a
Baythroid	IF MT	1 oz/acre	34.75 a
Gaucho	ST	0.165 ke	33.25 a
Cruiser	ST	0.133 ke	33.00 a
Untreated			28.00 b
Untreated			24.50 b

Means with the same letter are not significantly different. (LSD = 4.4208; alpha = 0.05)