Evaluation of the occurrence of root rots on bean plants ( <i>Phaseolus vulgaris</i> ) using different sowing methods and with different techniques of pesticide application

Abstract

Abstract Root rots are the main diseases caused by soil fungi and their incidence can vary according to seed treatment and sowing techniques used. They cause loss of plants, limit establishment, and canlead to reduced plant development. There are negative correlations between yield and the presence of root rots. This work was carried out in 1998 and 1999 in the province of León, Spain. The factors investigated were respectively —bean landrace ( Phaseolus vulgaris ), pesticide application system, and sowing technique. Differences were noticed in response to sowing techniques where the number of damaged plants was higher with sowing in furrows (mean, 1.31% plants affected). With regard to pesticide application differences were only observed at Ribas in 1999, where there was reduced plant damage (83% with seed treated and 97% with soil treated in the row). There was a significant pesticide application by sowing technique interaction at Ribas 1999. Rhizoctonia solani was detected in 91.8% of affected plants.