The Effect of the Length of the Growing Season of the Rice in Relation to Attacking Degree by Some Seedborn Pathogens

Y. STANCHEVA, M. TODOROV and S. ANGELOVA

Institute of Introduction and Plant Genetic Resources, BG-4122 Sadovo, Bulgaria

Abstract

STANCHEVA, Y., M. TODOROV and S. ANGELOVA, 1999. The effect of the lenght of the growing season of the rice in relation to attacking degree by some seedborn pathogens. Bulg. J. Agric. Sci., 5: 567-570

The connection between the seedborn fungal pathogens and the length of the growing season at rice was investigated. The survey was led in natural infection conditions. There is positive corelation betwen the attacking degree by seedborn pathogens (the genera Fusarium, Drechslera and Alternaria only) and the length of the growing season. Low temperatures and high humidity are favorable for fungal invasion by seedborn pathogens. The attacking degree by seedborn pathogens is different at genotypes with different origin. The founded correlation dependence between the length of the growing season and the attacking degree may be used in forming the breeding ideal with a view to create the most suitable for our conditions cultivar.

Key words: growing season, attacking degree, seedborn pathogens