scholarly journals Western Corn Rootworm Egg Distribution and Adult Emergence Under Two Corn Tillage Systems1

1968 ◽  
Vol 61 (5) ◽  
pp. 1424-1427 ◽  
Author(s):  
K. P. Pruess ◽  
G. T. Weekman ◽  
B. R. Somerhalder
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Egg Distribution

ROLE OF 2,4-DIHYDROXY-7-METHOXY-1,4-BENZOXAZIN-3-ONE (DIMBOA) IN THE RESISTANCE OF MAIZE TO WESTERN CORN ROOTWORM, DIABROTICA VIRGIFERA VIRGIFERA (LECONTE) (COLEOPTERA: CHRYSOMELIDAE)

1990 ◽  
Vol 122 (6) ◽  
pp. 1177-1186 ◽  
Author(s):  
Y.S. Xie ◽  
J.T. Arnason ◽  
B.J.R. Philogène ◽  
J.D.H. Lambert ◽  
J. Atkinson ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Adult Emergence ◽  
Dry Weight ◽  
Diabrotica Virgifera Virgifera ◽  
Head Capsule ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Fresh Weight ◽  
Growing Seasons

Abstract2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), the major hydroxamic acid present in corn root, was studied for its effects on western corn rootworm, Diabrotica virgifera virgifera (LeConte). Exogenously applied DIMBOA caused mortality in western corn rootworm larvae feeding on fresh corn roots. The LC50 (lethal concentration for 50% mortality) value (fiducial limits) was 153 ppm (108–209) and the LC90 value was 917 ppm (560–2297). The deleterious effects of DIMBOA on western corn rootworm larvae possibly are due to both feeding deterrence and toxicity. In a replicated pot trial during two growing seasons, two corn lines developed by Agriculture Canada from CIMMYT collections, ITR 3872 with high DIMBOA content in roots, and NTR-2 Ger. 4042 with low DIMBOA content in roots, were evaluated for resistance to western corn rootworm larvae. The results indicated that the high DIMBOA line (but not the low DIMBOA line) stressed western corn rootworm larvae to produce inferior adults based on the measurement of adult emergence number, adult weight, and adult head-capsule width. The effect of western corn rootworm on both corn lines with different DIMBOA levels was measured based on plant growth parameters including plant height, stem thickness, plant fresh weight, root fresh weight, plant dry weight, and root dry weight. ITR 3872 (high DIMBOA) showed significantly less damage than NTR-2 Ger. 4042 (low DIMBOA) in almost all plant parameters measured. The results suggest that DIMBOA may in some instances contribute to the resistance of corn to western corn rootworm larvae.

Oviposition site selected by the western corn rootworm (Diabrotica virgifera virgifera Leconte) in southern Ontario strip plots

2005 ◽  
Vol 85 (4) ◽  
pp. 949-954 ◽  
Author(s):  
C. C. Knight ◽  
K. P. Pauls ◽  
M. K. Sears ◽  
A. W. Schaafsma
Keyword(s):  
Insect Pest ◽  
Adult Emergence ◽  
Diabrotica Virgifera Virgifera ◽  
Conclusive Evidence ◽  
Western Corn Rootworm ◽  
Egg Laying ◽  
Larval Feeding ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Southern Ontario

Western corn rootworm (WCR), Diabrotica virgifera virgifera L., is the most serious insect pest of corn, Zea mays L., in North America. Crop rotation had successfully controlled this pest until the late 1980s when a new biotype that lays its eggs in non-corn crops was discovered in Illinois. This biotype has spread to parts of Indiana, Michigan, and Ohio, and threatens Ontario. By using emergence cages, Pherocon Am® sticky traps and corn root ratings, egg-laying behaviour of WCR in Ontario was assessed in strip crop settings that represent typical cropping systems of southern Ontario. WCR adults were active in both soybean and winter wheat fields in July and August. Larval feeding and adult emergence in first-year corn fields following soybean and wheat were similar, confirming that oviposition did occur in both crops. These data do not, however, provide conclusive evidence for the presence of the rotation resistant WCR in Ontario because previous studies have demonstrated that WCR are capable of utilizing other crops for oviposition. Key words: Western corn rootworm, Diabrotica virgifera virgifera, strip plots, corn, soybean, wheat (winter)

scholarly journals Effects of Bt Corn and Egg Density on Western Corn Rootworm (Coleoptera: Chrysomelidae) Adult Emergence and Estimation of Effective Bt Dose

2017 ◽  
pp. tow286
Author(s):  
L. A. Campbell ◽  
P. L. Prasifka ◽  
N. P. Storer ◽  
D. M. Rule ◽  
W. H. Hendrix
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Bt Corn ◽  
Corn Rootworm ◽  
Egg Density

Physiological Time Model for Predicting Adult Emergence of Western Corn Rootworm (Coleoptera: Chrysomelidae) in the Texas High Plains

2008 ◽  
Vol 101 (5) ◽  
pp. 1584-1593 ◽  
Author(s):  
Douglass E. Stevenson ◽  
Gerald J. Michels ◽  
John B. Bible ◽  
John A. Jackman ◽  
Marvin K. Harris
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
High Plains ◽  
Corn Rootworm ◽  
Time Model ◽  
Physiological Time ◽  
Texas High Plains

EFFECT OF POPULATION DENSITY OF IMMATURES ON SURVIVAL AND DEVELOPMENT OF THE WESTERN CORN ROOTWORM (COLEOPTERA: CHRYSOMELIDAE)

1989 ◽  
Vol 24 (2) ◽  
pp. 209-213 ◽  
Author(s):  
N. C. Elliott ◽  
G. R. Sutter ◽  
T. F. Branson ◽  
J. R. Fisher
Keyword(s):  
Abiotic Factors ◽  
Adult Emergence ◽  
Diabrotica Virgifera Virgifera ◽  
Developmental Time ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Julian Date ◽  
Survival And Development ◽  
Diabrotica Virgifera Virgifera Leconte

A field study with controlled infestations of eggs of the western corn rootworm, Diabrotica virgifera virgifera LeConte, was conducted over a four-year period. The percentage of insects surviving to adulthood was significantly reduced at an infestation of 2400 eggs per 0.3 m of row compared with rates of 300, 600, and 1200 eggs per 0.3 m of row. Survival to adulthood varied among years suggesting that biotic or abiotic factors in the soil, possibly soil moisture, may have influenced survival. The Julian date associated with mean adult emergence was significantly later at the 2400 egg infestation rate than at lower rates. These results suggest that immature survival is reduced and developmental time increased at high population densities.

Evaluation of adult emergence and larval root injury for Cry3Bb1-resistant populations of the western corn rootworm

2016 ◽  
Vol 141 (1-2) ◽  
pp. 41-52 ◽  
Author(s):  
P. M. Schrader ◽  
R. E. Estes ◽  
N. A. Tinsley ◽  
A. J. Gassmann ◽  
M. E. Gray
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Injury
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