scholarly journals Aerial Application of Insecticides for Control of First Generation European Corn Borer, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 234-235
Author(s):  
John Witkowski ◽  
Jerry Echtenkamp
Keyword(s):  
Analysis Of Variance ◽  
European Corn Borer ◽  
First Generation ◽  
Aerial Application ◽  
Corn Borer ◽  
Egg Masses ◽  
Untreated Check ◽  
The Town ◽  
Plot Design

Abstract The cornfield was located in Cedar County, northwest of the town of Hartington, NE. Two treatments and an untreated check were arranged in a strip plot design with one replication. Six black headed egg masses were infested onto 30 marked plants (3, ten plant subsamples) per treatment on 6 Jul. A Cessna 188 Ag Truck was used to make the applications on 13 Jul. On 18 Aug, all artificially infested plants were disected from tassel to ground and examined for corn borer cavities. Data were analyzed using analysis of variance procedures. Treatment means were separated using LSD procedures.

scholarly journals Insecticide Applied Aerially for Control of First Generation European Corn Borer, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 185-185
Author(s):  
John F. Witkowski
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Corn Borer ◽  
Egg Masses ◽  
The Town ◽  
Plot Design

Abstract The cornfield was located in Cedar county, northwest of the town of Hartington, NE. Six black headed egg masses were infested onto 30 marked plants (3, ten plant subsamples) per treatment on 24 Jun. A Cessna 188 Ag Truck was used to make the applications on 30 Jun. Aerial treatments were flown on in a strip plot design. On 9 Aug, all artificially infested plants were dissected from tassel to ground and examined for borer cavities.

scholarly journals Control of Second-Generation European Corn Borer, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 212-212
Author(s):  
John Witkowski ◽  
Jerry Echtenkamp
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
European Corn Borer ◽  
Second Generation ◽  
Middle Portion ◽  
Corn Borer ◽  
Egg Masses ◽  
Dixon County ◽  
Paper Disc

Abstract Foliar treatments of registered and non-registered insecticides for second-generation European corn borer control were applied to irrigated corn plots in Dixon County, NE on 12 Aug. Liquid-formulated insecticides were applied with a Hahn Hi-Boy calibrated to deliver 17 gpa at 30 psi. Four d prior to application, 6 black-headed egg masses on paper disc were pinned to the middle portion of 10 marked com plants in each replicate. Experimental design was RCB with 4 replications. On 25 Sep, the infested plants were dissected from tassel to ground, examined and the number of corn borer larvae recorded. Results were analyzed using analysis of variance procedures. Treatment means were separated using LSD procedures.

scholarly journals Efficacy of Selected Conventional and Experimental Insecticides for Control of European Corn Borer on Snap Beans, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 75-76
Author(s):  
J. T. Shaw ◽  
R. Weinzierl ◽  
J. W. Finger
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Snap Bean ◽  
Egg Masses ◽  
Snap Beans ◽  
Bean Plants ◽  
Canopy Area ◽  
Untreated Check ◽  
Paper Disc ◽  
Development Applications

Abstract Trials were arranged in a RCB design with four replications. Each replicate had a plot consisting of four 30-inch-wide, 20-ft-long rows. Twenty-five-foot-wide alleys were established between each of the four replications. Insecticides were applied to the middle two rows of each plot, leaving two untreated rows between each plot. Eight insecticide treatments were compared with two untreated checks after multiple manual infestations of ECB egg masses. The two untreated check plots were averaged for the ANOVA. Treatments were to be applied at 28, 21, 14, and 7 days before harvest (DBH); however, because of slow plant development, applications were made at 33, 27, 20, and 12 DBH, every six to eight days beginning on 31 Jul. All insecticide treatments were applied with a modified John Deere 6000 high-clearance vehicle (HCV) with a rear-mounted boom. Six Conejet (TX VS-6) hollow cone nozzles (three per row) were calibrated to deliver 25.2 gpa at 40 psi and a speed of 2.5 mph, utilizing a compressed air system. Four nozzles (2 per row) were attached to drops and directed toward the under surface of the snap bean canopy, area, a third nozzle (one per row) was mounted directly over the row. In one of the center two rows of the 4-row plot, a seven-foot section of row was marked and manually infested (by pinning) with black-headed stage ECB egg masses on wax paper disc, to the foliage of the snap bean plants. Four eggs masses per foot of row were attached i on the following dates: 25 Jul, 1, 8, 15, and 22 Aug.

scholarly journals Second Generation European Corn Borer Control with Aerial Application of Insecticides, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 205-205 ◽  
Author(s):  
Marlin E. Rice
Keyword(s):  
European Corn Borer ◽  
Second Generation ◽  
Corn Yield ◽  
Aerial Application ◽  
Yield Data ◽  
Corn Borer ◽  
Egg Masses ◽  
Scale Field

Abstract Insecticides were aerially applied to natural ECB populations in 2 fields near Indianola, IA, using an Ag-Cat airplane. Treatments were replicated 3 times in each field in a RCBD. All liquid formulations were applied in 1.0 gal of water per acre. Pretreatment counts of egg masses on 10 Aug indicated 11 egg masses per 100 plants in Field 1 and 19 egg masses per 100 plants in Field 2. Insecticides were applied on 16-17 Aug; the 2nd application for the split Penncap-M treatment was made on 31 Aug. Treatments were evaluated on 24-25 Sep by splitting stalks, ear shanks, and removing the husks from 10 plants in the center row of each plot (center of the spray swath) and counting live larvae. Yields were taken from the center 4 rows (Field 1) or 6 rows (Field 2) of each plot with a combine. Yields were measured on a truck scale (Field 1) or with a weigh wagon (Field 2) and samples were adjusted to 15.5% moisture and number 2 corn. Yield plot sizes ranged from 0.35-0.64 acre (Field 1) and 0.4 acre (Field 2). Yield data were not collected from replication 2 in Field 2 because of a hybrid change that split the plots. Data were analyzed by using PROC ANOVA or PROC GLM procedures of SAS. Mean separation was accomplished using Fisher’s protected LSD procedure (P = 0.10).

scholarly journals Control of Colorado Potato Beetle in the Red River Valley, Grand Forks, ND, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 129-129
Author(s):  
Robert A. Suranyi ◽  
Edward B. Radcliffe ◽  
Matthew P. Samuelson ◽  
Galen C. Thompson
Keyword(s):  
First Generation ◽  
Extended Period ◽  
River Valley ◽  
Red River ◽  
Egg Hatch ◽  
Egg Masses ◽  
Red River Valley ◽  
Summer Generation ◽  
Potato Beetle ◽  
Plot Design

Abstract Potatoes were planted 17 May at the Research Farm of the Red River Valley Potato Growers Association. Plots were four rows wide, 60 ft long, with 38 in rows and 12 in between plants. Plots were separated on all sides by 6.3 ft of cultivated soil. The experiment had a complete randomized plot design with four replications. Egg masses were flagged 15 Jun and checked daily. Thirty percent egg hatch was estimated to have occurred 22 Jun, but heavy rains and wet field conditions delayed first application of insecticidal sprays until 24 Jun. Subsequent spray applications were made 5, 12 Jul, and 8 Aug. Jun and Jul sprays were targeted against first generation larvae, Aug application against summer generation adults. All applications were made using a tractor-mounted boom sprayer, with a single Teejet nozzle over each row. Sprays were applied in 40 gal of water/acre at 40 psi. Egg masses, small larvae (1st and 2nd instar), large larvae (3rd and 4th instar), and adults were counted 27 Jun, 7, 14 Jul, and 10 Aug on 20 randomly selected plants from the two middle rows of each plot. Tuber yields were estimated by mechanical harvesting one row per plot 2 Sept. Defoliation data were recorded at each evaluation and expressed as mean percent of defoliation across sampling dates. The average number of insect counts across sampling dates are presented in the table. Best control resulted from the use of Furadan, Imidan, and Capture. Yield differences among treatments were not significantly correlated with any measure of insect numbers. Parts of the field were saturated for an extended period of time by heavy Jun rains, which adversely affected yields in all plots. Tuber yields ranged from 136.7 to 207.4 cwt/acre.

First Generation European Corn Borer Larvicide Trial, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 169-169
Author(s):  
Mike Haas ◽  
Doug Landis
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Corn Borer
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