Titre :	Genotype-pest-parasitoid interactions in sorghum : sorghum midge
Type de document :	texte imprimé
Auteurs :	K.G. Kausalya, Auteur ; K.F. Nwanze, Auteur ; Y.V.R. Reddy, Auteur
Année de publication :	1995
Importance :	p 223-231
Langues :	Anglais (eng)
Catégories :	SCIENCES AGRICOLES
Mots-clés :	SORGHO  INTERACTIONS GENOTYPE-RAVAGEUR-PARASITOIDE  INSECTE NUISIBLE
Résumé :	The results of a study on the effect of host –plant resistance on the development and population dynamics of the sorghum midge are presented. Three resistant (ICSV 745, ICSV 89058 and IS 70712) and three susceptible (Swarna, CSH 9 and ICSV 112) sorghum genotypes were sown on three dates each during the rainy and postrainy seasons of 1992/93. A modified headcage was developed for monitoring insect populations. The onset of parasitoide emergence was similar in resistant and susceptible genotypes, but commenced 2-3 weeks after initiation of midge emergence. Tetrastichus activity was higher in the first and third sowing dates than in the second and greater numbers were recovered from susceptible than from resistant genotypes. The lowest level of parasitization were recorded from midge-resistant ICSV 745 but no significant differences were found in the pattern of parasitoid emergence or the level of midge parasitization between resistant and susceptible genotypes. These results suggest that antagonistic effects on midge parasitoid development are not always associated with resistance factors. This indicates that there is the possibility of interphasing the breeding for host-plant resistance with enhanced biological control in the integrated management of sorghum midge.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES

Genotype-pest-parasitoid interactions in sorghum : sorghum midge [texte imprimé] / K.G. Kausalya, Auteur ; K.F. Nwanze, Auteur ; Y.V.R. Reddy, Auteur . - 1995 . - p 223-231.
Langues : Anglais (eng)

Catégories :	SCIENCES AGRICOLES
Mots-clés :	SORGHO  INTERACTIONS GENOTYPE-RAVAGEUR-PARASITOIDE  INSECTE NUISIBLE
Résumé :	The results of a study on the effect of host –plant resistance on the development and population dynamics of the sorghum midge are presented. Three resistant (ICSV 745, ICSV 89058 and IS 70712) and three susceptible (Swarna, CSH 9 and ICSV 112) sorghum genotypes were sown on three dates each during the rainy and postrainy seasons of 1992/93. A modified headcage was developed for monitoring insect populations. The onset of parasitoide emergence was similar in resistant and susceptible genotypes, but commenced 2-3 weeks after initiation of midge emergence. Tetrastichus activity was higher in the first and third sowing dates than in the second and greater numbers were recovered from susceptible than from resistant genotypes. The lowest level of parasitization were recorded from midge-resistant ICSV 745 but no significant differences were found in the pattern of parasitoid emergence or the level of midge parasitization between resistant and susceptible genotypes. These results suggest that antagonistic effects on midge parasitoid development are not always associated with resistance factors. This indicates that there is the possibility of interphasing the breeding for host-plant resistance with enhanced biological control in the integrated management of sorghum midge.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES