Damage and Yield Loss Induced by Stalk Borer (Lepidoptera: Noctuidae) in Field Corn

1986 ◽  
Vol 79 (1) ◽  
pp. 233-237 ◽  
Author(s):  
W. C. Bailey ◽  
L. P. Pedigo
Keyword(s):  
Yield Loss ◽  
Stalk Borer ◽  
Field Corn ◽  
Lepidoptera Noctuidae

Using Estimates of Weed Pressure to Establish Crop Yield Loss Equations

1994 ◽  
Vol 8 (1) ◽  
pp. 114-118 ◽  
Author(s):  
R. Gordon Harvey ◽  
Clark R. Wagner
Keyword(s):  
Linear Regression ◽  
Crop Yield ◽  
Yield Loss ◽  
Sweet Corn ◽  
Crop Yields ◽  
Yield Reduction ◽  
Weed Species ◽  
Field Corn ◽  
Efficacy Trials ◽  
Total Crop

Herbicide efficacy trials in field corn, sweet corn, and soybean were conducted at three locations in Wisconsin over a 6-yr period. Percent weed pressure (WP) was determined by visually estimating the contribution of all weed species present to the total crop and weed volume in each plot. Crop yields in each plot were measured. Percent crop yield reduction (YLDRED) was calculated by comparing mean yields of individual treatments with those of the highest yielding treatment in each trial. Linear regression analyses of YLDRED and WP data from 1640 field corn and 138 sweet corn treatments were significant. Nonlinear regression analysis of YLDRED and WP data from all 1374 soybean treatments was significant; however, a linear regression of those 1154 soybean treatments with WP ratings of 30 or less produced a more easily interpreted regression equation.

Survey and Phenology of Cutworms (Lepidoptera: Noctuidae) Infesting Field Corn in the Midwest

1984 ◽  
Vol 77 (2) ◽  
pp. 491-494 ◽  
Author(s):  
Richard N. Story ◽  
Armon J. Keaster ◽  
William B. Showers ◽  
John T. Shaw
Keyword(s):  
Field Corn ◽  
Lepidoptera Noctuidae

RELATION BETWEEN POD DAMAGE CAUSED BY LARVAE OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA WALKER (LEPIDOPTERA: NOCTUIDAE), AND YIELD LOSS, SHELLING, AND SEED QUALITY IN CANOLA

1987 ◽  
Vol 119 (4) ◽  
pp. 365-369 ◽  
Author(s):  
G.K. Bracken
Keyword(s):  
Yield Loss ◽  
Seed Quality ◽  
Control Measures ◽  
Feeding Duration ◽  
Plot Yield ◽  
Control Decision ◽  
Field Plots ◽  
Lepidoptera Noctuidae ◽  
Army Worm ◽  
Bertha Armyworm

AbstractCanola plants in 0.84-m2 field plots were exposed to 120 bertha army worm larvae per square metre, beginning at mid 5th instar, for increasing durations. Yield loss increased with feeding duration throughout the feeding period whereas the proportion of pods damaged increased rapidly at first then leveled at 45%. Pod damage was negatively correlated with plot yield but the regression was not statistically significant. More seed shelled from plants with damaged pods than from plants with no pod damage under field conditions simulating drying in the swath. Seed from damaged pods had greater proportions of green and broken seeds causing lower seed grade and these defects were evident in seed from plots with 21% or more damaged pods. Although control measures for bertha armyworm should not be undertaken before pod damage is observed, a control decision should be made before 20% of the pods are damaged.

scholarly journals Biological Control Potential of Native Entomopathogenic Nematodes (Steinernematidae and Heterorhabditidae) against Mamestra brassicae L. (Lepidoptera: Noctuidae)

Agriculture ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 388
Author(s):  
Anna Mazurkiewicz ◽  
Dorota Tumialis ◽  
Magdalena Jakubowska
Keyword(s):  
Entomopathogenic Nematodes ◽  
Yield Loss ◽  
Steinernema Feltiae ◽  
Effect Of Temperature ◽  
Mamestra Brassicae ◽  
Plant Pests ◽  
Biological Control Potential ◽  
Lepidoptera Noctuidae ◽  
Heavy Infestation ◽  
Cabbage Moth

The largest group of cabbage plant pests are the species in the owlet moth family (Lepidoptera: Noctuidae), the most dangerous species of which is the cabbage moth (Mamestra brassicae L.). In cases of heavy infestation by this insect, the surface of plants may be reduced to 30%, with a main yield loss of 10–15%. The aim of the present study was to assess the susceptibility of M. brassicae larvae to nine native nematode isolates of the species Steinernema feltiae (Filipjev) and Heterorhabditis megidis Poinar, Jackson and Klein under laboratory conditions. The most pathogenic strains were S. feltiae K11, S. feltiae K13, S. feltiae ZAG11, and S. feltiae ZWO21, which resulted in 100% mortality at a temperature of 22 °C and a dosage of 100 infective juveniles (IJs)/larva. The least effective was H. megidis Wispowo, which did not exceed 35% mortality under any experimental condition. For most strains, there were significant differences (p ≤ 0.05) in the mortality for dosages between 25 IJs and 50 IJs, and between 25 IJs and 100 IJs, at a temperature of 22 °C. Statistical analysis of the effect of temperature on mortality showed that only strain H. megidis Wipsowo exhibited significant differences (p ≤ 0.05) when applied at dosages of 50 IJs and 100 IJs.

Phenology of the Adult Stalk Borer, Papaipema nebris (Guenée), (Lepidoptera: Noctuidae) in Iowa

1985 ◽  
Vol 14 (3) ◽  
pp. 267-271 ◽  
Author(s):  
W. C. Bailey ◽  
G. D. Buntin ◽  
L. P. Pedigo
Keyword(s):  
Stalk Borer ◽  
Lepidoptera Noctuidae
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