ADAPTABILITY AND STABILITY OF REACTION OF SOYBEAN GENOTYPES TO POWDERY MILDEW, IN GREENHOUSE

The objective of this work was to study the behavior of soybean genotypes in relation to powdery mildew, through studies of adaptability and stability, in greenhouse, during five times of evaluation. The experimental design was completely randomized, arranged in split-plots, with 15 treatments and three types of control ( partial, total and without control) representing the plots and five times of evaluation ( subplots). The results showed that the interaction genotype x time changes the genotype behavior in relation to environmental variations, justifying the evaluation of their behavior in relation to time variations and to each control, using studies of adaptability and stability. In this context, there is a tendency for the most resistant genotypes to have better genotypic performance, and consequently with better behavior predictability, with the genotypes 'UFV-16', 'UFV-19', 'UFV89-361826 T2', 'FT-Abyara RC6 (F2)', 'UFV95-4121333', 'UFV94-334268', 'UFV94-5126' and 'FT-Abyara RC6 (F2)' standing out. The use of fungicide can affect the performance of the genotypes in relation to the powdery mildew. It was found that LILISI (Level of Infection of the Leaf Inferior Surface Infected by Powdery Mildew) discriminated the largest number of susceptible genotypes.