Réactions de quelques variétés de riz à la pyriculariose à Yangambi -Zaïre

Abstract

Reactions of Some Rice Varieties to Blast in Yangambi- Zaire. Rice blast, a cryptogamic disease caused by Pyricularia oryzae, is manifested in Zaire since many years. Field trials have been carried out for the screening of resistant varieties using the IRBN-design (International Rice Blast Nursery) established by the International Rice Research Institute (IRRI). Among 20 rice varieties tested under field conditions at Yangambi, only 2 locals (C1-13-3 and C2-3-1) were resistant to the disease while 4 others including 2 local varieties (C2-3-2 and Ituri-bambesa) and 2 IRRI varieties (IR 3179-25-3-4 and BR-11) were moderately resistant. These varieties, with low susceptibility reaction, could be integrated in rice selection program for humid forest regions.

Keywords

• Reactions
• Rice
• Blast disease
• Pyricularia oryzae
• Varietal resistance