000			02883nam a22004097a 4500
001			G64945
003			MX-TxCIM
005			20211006080035.0
008			121211s ||||f| 0 p|p||0|| |
020			_a968-6923-79-9
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH10
082	0	4	_a633.153 _bMIH
100	1		_aPerez Dominguez, J.F. _uInsect Resistant Maize: Recent Advances and Utilization. Proceedings of an International Symposium; Mexico, DF (Mexico); 27 Nov - 3 Dec 1994
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aDeveloping rootworm, Diabrotica virgifera zeae, Krysan and Smith, resistant maize in Mexico
260			_aMexico, DF (Mexico) _bCIMMYT : _c1997
340			_aPrinted
520			_aThe 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.
546			_aEnglish
591			_a9711|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	7	_aBreeding methods _gAGROVOC _2 _91030
650	1	0	_aDiabrotica
650	1	0	_aMexico
650	1	0	_aPest insects
650	1	7	_aPest resistance _gAGROVOC _2 _91199
650	1	0	_aSelection
653	0		_aCIMMYT
650	1	0	_91151 _aHybrids _gAGROVOC
700	1		_aMaya Lozano, J.B., _ecoaut.
700	1		_aMihm, J.A. _eed.
700	1		_aMihm, J.A., _ecoaut.
942			_cPRO
999			_c3618 _d3618