000			02629nam a22003977a 4500
001			G66306
003			MX-TxCIM
005			20211006075459.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-001-3
040			_aMX-TxCIM
072		0	_aH20
082	0	4	_a633.1194 _bDUV
100	1		_aReis, E.M. _uHelminthosporium Blights of Wheat: Spot Blotch and Tan Spot. Proceedings of an International Workshop; El Batan, Texcoco (Mexico); 9 - 14 Feb 1997
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aControl of leaf blights of wheat by elimination of the inoculum source
260			_aMexico, DF (Mexico) _bCIMMYT|UCL|BADC : _c1998
340			_aPrinted
520			_aThe main inoculum sources of wheat leaf blights are infected seed and crop residues. Infected seeds introduce the pathogens into newly cultivated areas or to areas where the inoculum was eliminated through crop rotation with non-host crops. Disease transmission rate from seeds is high and very efficient. High sporulation on coleoptile tips confirm the potential of seed inoculum for causing epidemics, depending 01l climatic conditions during emergence to tillering. Such findings highlighted the need for eradication of seedborne inoculum. Once inoculum is introduced by seed, disease develops on above-ground plant parts where pathogens sporulate. Conidia are transported to new infection sites and to the soil by wind and rain splashes. Inoculum in the soil, as free dormant conidia (Bipolaris sorokiniana), increases with the amount of necrotic tissue. Sporulation continues in the residue until its complete decomposition. Dormant conidia may survive free in the soil for up to 37 months. Crop rotation may eliminate pathogens or reduce their inoculum to such an extent that they cannot cause an epidemic, even under favorable weather. Spot blotch may be economically controlled by treating seeds with fungicides and by rotating crops. In this case, epidemics do not reach the economical damage threshold level of 70-80% foliar incidence.
546			_aEnglish
591			_a9806|AGRIS 9802
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aBlights
650	1	0	_aClimatic factors _91048
650	1	0	_aDisease control
650	1	0	_aInoculation methods
650	1	0	_aPathogens _91197
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
653	0		_aCIMMYT
650	1	7	_aTriticum _gAGROVOC _2 _91295
700	1		_aCasa, R.T., _ecoaut.
700	1		_aDuveiller, E.|Dubin, H.J.|Reeves, J.|McNab, A. _eeds.
700	1		_aMedeiros, C.A., _ecoaut.
942			_cPRO
999			_c3852 _d3852