Developing rootworm, Diabrotica virgifera zeae, Krysan and Smith, resistant maize in Mexico
Perez Dominguez, J.F.
Developing rootworm, Diabrotica virgifera zeae, Krysan and Smith, resistant maize in Mexico - Mexico, DF (Mexico) CIMMYT : 1997 - Printed
The Mexican corn rootworm (CRW) Diabrotica virgifera zeae, is one of the most important insect pests of maize in the Mexican Corn Belt - the Bajio region of central Mexico. Field evaluations are presented for resistance characteristics of S1, S2 and S3 maize lines derived from CIMMYT Population 593 selected for resistance to corn rootworms. The techniques used included: the use of a susceptible hybrid check planted at regular repented intervals throughout the screening nurseries; comparison of phonological development of maize in paired plots with and without chemical protection ngni1lst rootworms; degree and amount of root lodging; visual estimates of root pruning by CRW lan1ne; secondary root development; firmness of root anchoring as measured by force required for vertical root pulling; and percentage of plants surviving CRW damage. Results are presented for two years of evaluation and selection for resistance. Lines selected in the 1993 summer screening nursery were planted for increase and improvement in a winter nursery. Of 16 materials selected for advancement 8 were outstanding for rootworm resistance characteristics. In the 1994 summer nursery advanced S3 lines were screened at two locations where 25 and 15 lines were selected respectively. Considering the resources and techniques available for screening the resistance mechanisms we are seeking are antibiosis and tolerance. In the coming winter nursery we are planning to make test crosses using selected resistant lines crossed onto a susceptible population tester as well as to advance lines to another cycle of inbreeding.
English
968-6923-79-9
Breeding methods
Diabrotica
Mexico
Pest insects
Pest resistance
Selection
Hybrids
CIMMYT
633.153 / MIH
Developing rootworm, Diabrotica virgifera zeae, Krysan and Smith, resistant maize in Mexico - Mexico, DF (Mexico) CIMMYT : 1997 - Printed
The Mexican corn rootworm (CRW) Diabrotica virgifera zeae, is one of the most important insect pests of maize in the Mexican Corn Belt - the Bajio region of central Mexico. Field evaluations are presented for resistance characteristics of S1, S2 and S3 maize lines derived from CIMMYT Population 593 selected for resistance to corn rootworms. The techniques used included: the use of a susceptible hybrid check planted at regular repented intervals throughout the screening nurseries; comparison of phonological development of maize in paired plots with and without chemical protection ngni1lst rootworms; degree and amount of root lodging; visual estimates of root pruning by CRW lan1ne; secondary root development; firmness of root anchoring as measured by force required for vertical root pulling; and percentage of plants surviving CRW damage. Results are presented for two years of evaluation and selection for resistance. Lines selected in the 1993 summer screening nursery were planted for increase and improvement in a winter nursery. Of 16 materials selected for advancement 8 were outstanding for rootworm resistance characteristics. In the 1994 summer nursery advanced S3 lines were screened at two locations where 25 and 15 lines were selected respectively. Considering the resources and techniques available for screening the resistance mechanisms we are seeking are antibiosis and tolerance. In the coming winter nursery we are planning to make test crosses using selected resistant lines crossed onto a susceptible population tester as well as to advance lines to another cycle of inbreeding.
English
968-6923-79-9
Breeding methods
Diabrotica
Mexico
Pest insects
Pest resistance
Selection
Hybrids
CIMMYT
633.153 / MIH