Hydroxamic acid content in maize (Zea mays) roots of 18 Ontario recommended hybrids and prediction of antibiosis to the western corn rootworm, Diabrotica virgifera virgifera LeConte [Coleoptera: Chrysomelidae]

1993 ◽  
Vol 73 (1) ◽  
pp. 359-363 ◽  
Author(s):  
R. A. Assabgui ◽  
J. T. Arnason ◽  
R. I. Hamilton
Keyword(s):  
Hydroxamic Acid ◽  
High Performance ◽  
Diabrotica Virgifera Virgifera ◽  
Hydroxamic Acids ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Maize Hybrids ◽  
Root Extracts ◽  
Diabrotica Virgifera Virgifera Leconte

High performance liquid chromatography was used to assess concentrations of hydroxamic acids in maize root extracts of 18 greenhouse-grown hybrids recommended in Ontario. On the basis of hydroxamic acid concentrations, low-level antibiosis against the western corn rootworm, Diabrotica virgifera virgifera LeConte was predicted for the majority of these (1990) hybrids, when grown under field conditions. Key words: Antibiosis, Chrysomelidae, Diabrotica, DIMBOA, hydroxamic acids, maize hybrids

Hydroxamic acid content and plant development of maize (Zea mays L.) in relation to damage by the western corn rootworm, Diabrotica virgifera virgifera LeConte

1995 ◽  
Vol 75 (4) ◽  
pp. 851-856 ◽  
Author(s):  
Rafik A. Assabgui ◽  
J. Thor Arnason ◽  
Robert I. Hamilton
Keyword(s):  
Zea Mays L ◽  
Diabrotica Virgifera Virgifera ◽  
Hydroxamic Acids ◽  
Field Resistance ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Root Extracts ◽  
Maize Plants ◽  
Diabrotica Virgifera Virgifera Leconte

Recently identified resistance factors in two inbreds of maize (Zea mays L.) were investigated in relation to their concentrations over the course of maize root development. The purpose of this study was to determine the time of peak expression in relation to field resistance to larvae of the western corn rootworm (Diabrotica virgifera virgifera LeConte). Bi-weekly variation in root hydroxamic acid content, as determined by high-pressure liquid chromatography, was compared with field resistance of 4- to 16-wk-old maize plants. The phytochemical analysis showed that the major hydroxamic acids in corn roots were 2,4-dihydroxy-7-methoxy-(2H)-1,4-benzoxazin-3(4H)-one (DIMBOA), and its main degradation product was 6-methoxy-benzoxazoline (MBOA). The highest concentrations of DIMBOA equivalents, 2-hydroxy-7-methoxy-1,4(2H)-benzoxazin-3-one (HMBOA) and total hydroxamic acids were found in 6-wk-old root extracts for the inbred with low susceptibility, and 10-wk-old root extracts for the inbred with high susceptibility. In field trials, the inbred with low susceptibility suffered maximal root damage 8 wk post-infestation, followed by a rapid and pronounced recovery. Damage to the root system of the inbred with high susceptibility rose rapidly throughout the growing season, reaching a maximum 12 wk post-infestation, followed by minimal recovery. Plant morphological factors were unaffected and are insensitive as measurements of plant damage. Based on the observations of this study, it would appear that the concentration of hydroxamic acids in the root systems of maize plants plays a role in resistance to western corn rootworm larvae under field conditions. Key words: 2,4-dehydroxy-7-methoxy-1,4-benzoxazin-3-one, Diabrotica virgifera virgifera, western corn rootworm, antibiosis, hydroxamic acids, biochemical resistance

scholarly journals Inheritance and Fitness Costs of Cry3Bb1 Resistance in Diapausing Field Strains of Western Corn Rootworm (Coleoptera: Chrysomelidae)

2020 ◽  
Vol 113 (6) ◽  
pp. 2873-2882
Author(s):  
Ram B Shrestha ◽  
Aaron J Gassmann
Keyword(s):  
Developmental Rate ◽  
Diabrotica Virgifera Virgifera ◽  
Dry Mass ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Adult Size ◽  
Inheritance Of Resistance ◽  
Diabrotica Virgifera ◽  
Fitness Costs ◽  
Diabrotica Virgifera Virgifera Leconte

Abstract Field-evolved resistance to Cry3Bb1 corn by western corn rootworm, Diabrotica virgifera virgifera LeConte (Colleoptera: Chrysomellidae), has been reported in field populations in Iowa, Illinois, Nebraska, and Minnesota. Inheritance and fitness costs associated with Cry3Bb1 resistance have been determined for non-diapausing laboratory strains of western corn rootworm with either laboratory-selected resistance or field-derived resistance. However, information on inheritance and fitness costs of Cry3Bb1 resistance in the diapausing field populations is lacking. In this study, we determined the inheritance of Cry3Bb1 resistance for four diapausing field strains of western corn rootworm using plant-based bioassays. We also determined the fitness costs for eight diapausing field populations in a greenhouse experiment. We found that Cry3Bb1 resistance was an autosomal trait and that the inheritance of resistance was mostly non-recessive; however, there was some variation in the dominance of Cry3Bb1 resistance. We did not find evidence of fitness costs affecting survival to adulthood, developmental rate, or adult dry mass. However, we did detect a fitness cost affecting adult size. The results of this study will add to the current understanding of field-evolved resistance to Cry3Bb1 corn by western corn rootworm and help in developing better strategies to manage resistance.

scholarly journals Prediction of adult western corn rootworm (Diabrotica virgifera virgifera LeConte) emergence

2013 ◽  
Vol 49 (No. 2) ◽  
pp. 89-97
Author(s):  
T. Středa ◽  
O. Vahala ◽  
H. Středová
Keyword(s):  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
Threshold Temperature ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Degree Days ◽  
The Czech Republic ◽  
Sum Of Effective Temperatures ◽  
Effective Temperatures ◽  
Diabrotica Virgifera Virgifera Leconte

The sum of effective temperatures (SET) of adult western corn rootworm (WCR) occurrence was determined based on several criteria. The risk of WCR occurrence was mapped, and the areas of continuous reproduction of WCR in the Czech Republic were identified. The daily soil SET was observed until the initial adult WCR occurrence, and it ranged from 414 degree days (DD) when the lower threshold temperature (LTT) was 12.5°C at 0.02 m depth to 719 DD (LTT of 10°C at a depth of 0.05 m). The daily air SET ranged from 415 DD (LTT 12.5°C at a height of 2 m) to 726 DD (LTT of 10°C at a height of 0.05 m).  

Identification of sensilla involved in taste mediation in adult western corn rootworm (Diabrotica virgifera virgifera LeConte)

1995 ◽  
Vol 21 (3) ◽  
pp. 313-329 ◽  
Author(s):  
Sylwester Chyb ◽  
Herbert Eichenseer ◽  
Benedict Hollister ◽  
Christopher A. Mullin ◽  
James L. Frazier
Keyword(s):  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Diabrotica Virgifera Virgifera Leconte
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