EFFECTS OF THE ATTACK OF WHITE FLY TRANSMITTED VIRUS DISEASES
HELDER DE MAIOR FERRAZ DOMINGOS FORNASIERI FILHO ALFREDO LAM SANCHEZ
Two seed lots from eight cultivars of commom beans (Phaseolus
vulgaris L.) one obtained from attacked plants with white fly Bemisia tabacci Genn
transmitted virus diseases, and the other from healthy plants, were submitted to
seed germination and vigour tests, in order to verify comparatively the effects of
the virus attack on these characteristics. It was verified that the attack of virus
decreased the values of the studied characteristics; there was also a variability in
the general behavior of the cultivars. This fact can be more evidenced by their
results obtained in the two lots of seeds. Higher reductions were obtained for 100
seed weight and for seed germination, around 38%; however, reductions for length
of the aerial art and root system, and also for the dry matter weight of these
seedlings parts were lower and more variable. Cultivar "Carioca" was the most
susceptible due to the higher reductions presented; in the other side, cultivars,
"Aroana", "Rosinha G-2" and "Roxão Lustroso", presented an advantageous
degree of susceptibility.
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