Titre :	Screening and breeding for resistance to millet head miner
Type de document :	texte imprimé
Auteurs :	O. Youm, Auteur ; K.A. Kumar, Auteur
Année de publication :	1995
Importance :	p 201-209
Langues :	Anglais (eng)
Catégories :	SCIENCES AGRICOLES
Mots-clés :	CRIBLAGE A LA RESISTANCE  RESISTANCE AUX RAVAGEURS  MINEUSE DE L'EPI DE MIL
Résumé :	The millet head miner is a key pest of millet in sub-Saharan Africa. To develop control strategies for reducing pest incidence, studies were conducted and focused on varietal resistance. These studies involved both natural infestation and artificial head cage infestation. While there are differences among genotypes in their reaction to head miner infestation, studies have shown that screening under natural conditions often yields variable results that can lead to erroneous conclusions. Furthermore, varieties with a shorter growing cycle (shorter time to 50% flowering) were more damaged than those with a longer cycle. To develop a more reliable screening technique, a headcage was used in conjunction with artificial infestation. Results showed that controlled cage infestation was more reliable than screening under natural infestation. Interactions occurred between panicle stage and stage of infesting larvae; and both affected the level of panicle damage. The infestation of millet at 1/3 panicle exsertion with 1-week old larvae resulted in more panicle damage than infestation with 1-day old larvae, based on a 1-9 rating scale (1=<10%; 9=>80% damage). Implications of these findings in future screening and breeding for head miner resistance are discussed.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES

Screening and breeding for resistance to millet head miner [texte imprimé] / O. Youm, Auteur ; K.A. Kumar, Auteur . - 1995 . - p 201-209.
Langues : Anglais (eng)

Catégories :	SCIENCES AGRICOLES
Mots-clés :	CRIBLAGE A LA RESISTANCE  RESISTANCE AUX RAVAGEURS  MINEUSE DE L'EPI DE MIL
Résumé :	The millet head miner is a key pest of millet in sub-Saharan Africa. To develop control strategies for reducing pest incidence, studies were conducted and focused on varietal resistance. These studies involved both natural infestation and artificial head cage infestation. While there are differences among genotypes in their reaction to head miner infestation, studies have shown that screening under natural conditions often yields variable results that can lead to erroneous conclusions. Furthermore, varieties with a shorter growing cycle (shorter time to 50% flowering) were more damaged than those with a longer cycle. To develop a more reliable screening technique, a headcage was used in conjunction with artificial infestation. Results showed that controlled cage infestation was more reliable than screening under natural infestation. Interactions occurred between panicle stage and stage of infesting larvae; and both affected the level of panicle damage. The infestation of millet at 1/3 panicle exsertion with 1-week old larvae resulted in more panicle damage than infestation with 1-day old larvae, based on a 1-9 rating scale (1=<10%; 9=>80% damage). Implications of these findings in future screening and breeding for head miner resistance are discussed.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES