scholarly journals Control of European Corn Borer Larvae on Reproductive Stage Field Corn, 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 228-228 ◽  
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
European Corn Borer ◽  
Spider Mite ◽  
Reproductive Stage ◽  
Corn Cob ◽  
Corn Borer ◽  
Total Length ◽  
Field Corn ◽  
Arthropod Predators

Abstract Various pesticides were applied to blister stage (R6 stage) field corn on 9 Aug, near North Platte, NE. The treatments were applied with a CO2-charged backpack sprayer through 8001 flat fan nozzles at 30 psi, in a total volume of 21 gal/acre. Each treatment was applied to 3 by 10 m plots and replicated 4 times in a RCB design. On the day of application, neonate ECB larvae were applied, in corn cob grit, to the axils of 3 leaves of 5 plants in each plot. Artificially infested plants were collected 40 DAT, split from root to tassel and evaluated for the presence of ECB caused cavities, the total length of ECB caused cavities and live ECB larvae. The incidence of lodged plants was determined 48 DAT on 20 consecutive plants from the middle of each of the center 2 rows of each plot. BGM infested leaves were attached to 2 plants in each plot 2 d prior to application. Seven, 14, and 28 DAT the size of spider mite colonies were rated, on a 0-6 scale, on the underside of the 4 lowest leaves of the previously infested plants. These plants were also evaluated for the presence of arthropod predators.

scholarly journals Control of European Corn Borer Larvae and Effect on Spider Mites on Reproductive Stage Field Corn, 1995

1997 ◽  
Vol 22 (1) ◽  
pp. 228-229
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
European Corn Borer ◽  
Spider Mites ◽  
Reproductive Stage ◽  
Corn Borer ◽  
Field Corn

scholarly journals CONTROL OF EUROPEAN CORN BORER LARVAE ON REPRODUCTIVE STAGE FIELD CORN, 1999

2000 ◽  
Vol 25 (1) ◽  
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
European Corn Borer ◽  
Reproductive Stage ◽  
Corn Borer ◽  
Field Corn

scholarly journals Maize inbred line B96 is the source of large-effect loci for resistance to generalist but not specialist spider mites

2021 ◽  
Author(s):  
Huyen Bui ◽  
Robert Greenhalgh ◽  
Gunbharpur S. Gill ◽  
Meiyuan Ji ◽  
Andre H. Kurlovs ◽  
...  
Keyword(s):  
Zea Mays ◽  
Tetranychus Urticae ◽  
European Corn Borer ◽  
Spider Mite ◽  
Insect Pests ◽  
Spider Mites ◽  
Mite Species ◽  
Chromosome 1 ◽  
Corn Borer ◽  
Oligonychus Pratensis

AbstractMaize (Zea mays subsp. mays) yield loss from arthropod herbivory is substantial. While the basis of resistance to major insect herbivores has been comparatively well-studied in maize, less is known about resistance to spider mite herbivores, which are distantly related to insects and feed by a different mechanism. Two spider mites, the generalist Tetranychus urticae, and the grass-specialist Oligonychus pratensis, are notable pests of maize, especially during drought conditions. We assessed the resistance to both mite species of 38 highly diverse maize lines, including several previously reported to be resistant to one or the other mite species. We found that line B96, as well as its derivatives B49 and B75, were highly resistant to T. urticae. In contrast, neither these three lines, nor any others included in our study, were notably resistant to O. pratensis. Quantitative trait locus (QTL) mapping with F2 populations from crosses of B49, B75, and B96 to susceptible B73 identified a large-effect QTL on chromosome 6 as underlying T. urticae resistance in each line, with an additional QTL on chromosome 1 in B96. Genome sequencing and haplotype analyses identified B96 as the apparent sole source of resistance haplotypes. Our study identifies loci for use in maize breeding programs for T. urticae resistance, as well as to assess if the molecular-genetic basis of spider mite resistance is shared with insect pests of maize, as B96 is also among the most resistant known maize lines to several insects, including the European corn borer, Ostrinia nubilalis.Key message Maize(Zea mays subsp. mays) inbred lines B49, B75, and B96 harbor large-effect loci for resistance to the generalist spider mite Tetranychus urticae, but not the specialist Oligonychus pratensis.

132 Note: Errata and Extensions for "The Distribution of the European Corn Borer Larvae Pyrausta nubilalis (Hbn.), in Field Corn"

Biometrics ◽  
1958 ◽  
Vol 14 (3) ◽  
pp. 432 ◽  
Author(s):  
Judson U. McGuire ◽  
Tom A. Brindley ◽  
T. A. Bancroft
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Field Corn ◽  
Pyrausta Nubilalis

Rate of European Corn Borer (Lepidoptera: Pyralidae) Egg-mass Detrition in Field Corn

1986 ◽  
Vol 15 (4) ◽  
pp. 817-820
Author(s):  
D. D. Calvin ◽  
M. C. Knapp ◽  
Kuang Xingquan ◽  
F. L. Poston ◽  
S. M. Welch
Keyword(s):  
European Corn Borer ◽  
Egg Mass ◽  
Corn Borer ◽  
Field Corn ◽  
Lepidoptera Pyralidae

The Distribution of European Corn Borer Larvae Pyrausta nubilalis (Hbn.), in Field Corn

Biometrics ◽  
1957 ◽  
Vol 13 (1) ◽  
pp. 65 ◽  
Author(s):  
Judson U. McGuire ◽  
Tom A. Brindley ◽  
T. A. Bancroft
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Field Corn ◽  
Pyrausta Nubilalis

scholarly journals Insecticide Control of Adult Western Corn Rootworm and Subsequent Effect on Twospotted Spider Mites in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 210-210
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Spider Mite ◽  
Western Corn Rootworm ◽  
Large Individual ◽  
Twospotted Spider Mite ◽  
Pesticide Application ◽  
Field Corn ◽  
Arthropod Predators ◽  
Subsequent Effect ◽  
Insecticide Control ◽  
Twospotted Spider

Abstract Various pesticides were applied to blister stage (R6 stage) hybrid field corn on 9 Aug, near North Platte, in westcentral NE. The treatments were applied with a CO2-charged backpack sprayer through 8001 flat fan nozzles at 206,786 Pa (30 psi), in a total volume of 196.4 liter/ha (21 gal/acre). Each treatment was applied to 3 × 10 m plots, replicated 4 times in a RCBD. Three d before the pesticide application the number of WCR beetles was counted on 2 randomly-selected plants in the middle of each plot. Three d prior to application, 3 spider mite-infested plants in each plot were marked to follow population trends on the same plants. The size of twospotted spider mite colonies was rated on the underside of 3 leaves on each of these plants, one below the ear, the ear leaf and one leaf above the ear. Ratings were made on a 0-6 scale where 0 = no mites, 1 = individual mites, 2 = small colonies, 3 = large, individual colonies, 4 = large connected colonies but not completely covering the underside of the leaf, 5 = colonies completely covering the underside of the leaf, 6 = leaf dead due to spider mite damage. These plants were also evaluated for the presence of arthropod predators. Two d following application the number of rootworm beetles was evaluated by counting all beetles on two randomly selected plants in the middle of each plot. Previously marked plants were evaluated for the size of twospotted spider mite colonies and the presence of arthropod predators at 7, 14, 21 and 44 DAT. Data were statistically analyzed with analysis of variance and an LSD test was used for mean separation.

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