Registration of NGSDCRW1(S2)C4 Maize Germplasm

Kahler, A. L.; Telkamp, R. E.; Penny, L. H.; Branson, T. F.; Fitzgerald, Paul J.

doi:10.2135/cropsci1985.0011183x002500010058x

Cited by 17 publications

(17 citation statements)

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“…We found, as have several other researchers (Chiang and French 1980, Kahler et al 1985, Riedell and Evenson 1993, Allee and Davis 1996, that choice of cultivar affected the amount of lodging. For More, which showed the least lodging in 1994, cultivar selection proved to be more important than time of planting in reducing the proportion of lodged plants.…”

Section: Discussionsupporting

confidence: 85%

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Hoffmann

Kirkwyland

Gardner

2000

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The western corn rootworm, Diabrotica virgifera virgifera LeConte, is an important pest of corn, Zea mays L., causing yield losses from root damage, plant lodging, and silk feeding. Because little is known about its impact on sweet corn, we conducted research to evaluate the combined effects of insecticide, planting date, and cultivar on root damage, plant lodging, and yield in central New York sweet corn. We also examined the influence of planting date and cultivar on the emergence of adult western corn rootworms. The research was conducted in 1994 and again in 1995 by using a split-split plot experimental design with insecticide as main plot, planting date as subplot, and cultivar as sub-subplot. The effect of cultivar on beetle emergence was not significant. Root damage was not correlated with adult emergence in 1994 but was positively correlated in 1995. In 1994, there was no interaction of the main factors, and all factors had a significant impact on root damage. In 1995 there was an interaction of insecticide and planting date, and of cultivar and planting date. Generally, root damage was reduced by insecticide and later planting. Plant lodging was affected by the interaction of insecticide and planting date, and the interaction of cultivar and planting date, for both years of the study. As with root damage, lodging was reduced with insecticide treatment and later planting but also was dependent on cultivar. In 1994 and especially in 1995, silk clipping by adult western corn rootworms precluded much inference about how yield was influenced by larval feeding damage on roots. The number of emerging western corn rootworm adults was lower and later in later plantings.

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Section: Discussionsupporting

confidence: 85%

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Hoffmann

Kirkwyland

Gardner

2000

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“…Among the experimental synthetic maize populations, CRW8‐3 had the lowest mean root damage rating, which was comparable with that of the non‐transgenic hybrid DeKalb ® 46‐26, and appeared to be tolerant to western corn rootworms, as evidenced by high mean root fresh weight and compensatory root growth ratings. NGSDCRW1(S2)C4, a maize line with rootworm resistance based on high root‐pull measurements (Kahler et al. 1985) had significantly heavier roots than the other synthetic maize populations.…”

Section: Discussionmentioning

confidence: 99%

Field screening maize germplasm for resistance and tolerance to western corn rootworms (Col.: Chrysomelidae)^†

Prischmann

Dashiell

Schneider

et al. 2007

J Applied Entomology

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In the hopes of lessening the current reliance on soil insecticides, developing a viable alternative for transgenic maize hybrids, and providing sustainable options for Europe, researchers recently have been developing novel maize lines that exhibit resistance and/or tolerance to corn rootworm larvae. Here we report the results of a 2-year field experiment in a northern growing region assessing the resistance and tolerance of 10 experimental synthetic maize populations selected for varying levels of damage from western corn rootworm larvae, Diabrotica virgifera virgifera LeConte (Col.: Chrysomelidae) and four maize hybrids. Maize non-preference, antibiosis and tolerance to rootworms was evaluated using previously established methods, including: the Iowa 1-6 root damage rating scale, root fresh weight, compensatory root growth ratings and adult rootworm emergence. Among the experimental synthetic maize populations, BS29-11-01 was the most susceptible, and had a mean root damage rating that was greater than the highly susceptible maize hybrid B37 · H84. This line also had the lowest mean root fresh weight and one of the lowest mean compensatory root growth ratings. In contrast, CRW8-3 appeared to be tolerant to western corn rootworms, and had the lowest mean root damage rating, which was comparable with that of the non-transgenic hybrid DeKalb Ò 46-26.

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“…; Kahler et al. ). These maize lines were included in this experiment because they may be useful in future management of this pest.…”

Section: Methodsmentioning

confidence: 97%

Fitness costs of resistance to Cry3Bb1 maize by western corn rootworm

Hoffmann

French

Hellmich

et al. 2015

J Applied Entomology

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Crops producing toxins derived from the bacterium Bacillus thuringiensis (Bt) are widely planted to manage insect pests including western corn rootworm, Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), which is a significant pest of maize in the United States and Europe. However, the widespread use of Bt maize places intense selection pressure on pest populations to evolve resistance, and field-evolved resistance to Bt maize by western corn rootworm has been documented in the United States. In conjunction with non-Bt refuges, fitness costs of Bt resistance can delay resistance evolution. Fitness costs arise in the absence of Bt toxin when individuals with resistance alleles have lower fitness than Btsusceptible genotypes. We quantified the level of resistance and fitness costs of resistance for a strain of western corn rootworm with laboratoryselected resistance to transgenic maize (Zea mays L.) producing Bt toxin Cry3Bb1. Survival to adulthood on Cry3Bb1 maize was more than twofold higher for resistant insects vs. susceptible insects, which is similar to the magnitude of resistance first observed in the field. Fitness costs were measured in two experiments; the first used maize hybrids and the second used inbred lines. The experiment with maize hybrids compared resistant and susceptible strains while the experiment with maize inbreds compared resistant, susceptible and heterozygous genotypes. The only nonrecessive fitness cost detected (i.e. cost affecting heterozygotes) was for adult size. Recessive fitness costs (i.e. costs affecting the resistant strain) were observed for developmental rate, female survival and egg viability. However, when reared on non-Bt maize, the resistant strain also displayed higher fecundity, higher survival for males and greater adult longevity compared to the susceptible strain. These results suggest that resistance to Bt maize by western corn rootworm may not impose substantial fitness costs, and consequently, may evolve quickly and persist once present.

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Registration of NGSDCRW1(S2)C4 Maize Germplasm

Cited by 17 publications

References 0 publications

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Field screening maize germplasm for resistance and tolerance to western corn rootworms (Col.: Chrysomelidae)^†

Fitness costs of resistance to Cry3Bb1 maize by western corn rootworm

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Registration of NGSDCRW1(S2)C4 Maize Germplasm

Cited by 17 publications

References 0 publications

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Impact of Western Corn Rootworm (Coleoptera: Chrysomelidae) on Sweet Corn and Evaluation of Insecticidal and Cultural Control Options

Field screening maize germplasm for resistance and tolerance to western corn rootworms (Col.: Chrysomelidae)†

Fitness costs of resistance to Cry3Bb1 maize by western corn rootworm

Contact Info

Product

Resources

About

Field screening maize germplasm for resistance and tolerance to western corn rootworms (Col.: Chrysomelidae)^†