Influência da concentração de inóculo e da idade da planta na intensidade de doença causada por Fusarium graminearum em Egeria densa e E. najas

Content Provider	Semantic Scholar
Author	Neto, Carlos R. Borges Gorgati, Cláudia Queiroz Pitelli, Robinson Antonio
Copyright Year	2004
Abstract	ABSTRACT Effects of inoculum concentrations and plant age in Fusariumgraminearum disease development on Egeria densa and E. najas A very promising isolate of Fusarium graminearum is beingstudied in the UNESP/Campus de Jaboticabal, where it was provento be effective in the control of Egeria densa and E. najas , thesubmerged aquatic macrophytes. To study the effect of differentconcentrations of inoculum in dis ease severity, experiments have beenconducted in Biochemical Oxigen Demand (B OD) incubators withconcentrations varying from one-tenth, of 0.1 up to 1.4 g/l in ricecolonized with F. graminearum mycelia. To verify the possible effectof the age of the plant on disease severity, p lants with at least 35 cmof length, were excised in diverse segments corresponding to theage of growth. The treatments with concentrations of inoculum from0.5 g/l had presented symptoms. All the treatments inoculated withfungi, in concentrations from 0.5 g/l, presented drastic reductionin the production of fresh biomass. All the segments used as plant-test (0-32 cm length) presented susceptibility to fungus. The topof the leaves of both the species at age 1 had the most severedisease symptoms at the sixth and eighth days after thecorresponding inoculation. However, segments to ages 2 and age 3presented the greatest reduction of fresh biomass at day eight,although symptoms were not severe as in age 1. With relation tothe profit of fresh biomass, the control had always presented biggergrowth over the respective inoculated treatments, however thecorresponding segments to age 4 had presented minor profit of freshbiomass than the other ages.
Starting Page	282
Ending Page	288
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1590/S0100-41582004000300007
Alternate Webpage(s)	https://repositorio.unesp.br/bitstream/handle/11449/1961/S0100-41582004000300007.pdf;jsessionid=D42ED3ABE66800ADD47C1EF8DF7DE9B4?sequence=1
Alternate Webpage(s)	https://doi.org/10.1590/S0100-41582004000300007
Volume Number	29
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article