Resumen

URDANETA, J  y  BORGES, J. A. Behavior of five fungical pathologies in 14 sugar cane cultivars (Saccharum spp.) with forage aims in Yaracuy state, Venezuela. Rev. Fac. Agron. [online]. 2008, vol.25, n.3, pp.455-469. ISSN 0378-7818.

With the purpose of determining the presence of five fungical pathologies and their behavior in relation to the agronomic handling and plants age, in 14 cultivars of sugar cane with forage aims, a research on the experimental field at Danac Foundation was carried out, based on the existing agro-ecologic conditions for that zone in the Yaracuy state. Sugar cane cultivars evaluated were 10 experimental and four commercial ones. Evaluations were based on visual estimations before each harvest frequency (3, 4, 6, 10 months) in each one of the experimental plots during 32 months of evaluation. Observations were compared with the existing scales for rust, pokkah boeng, ring spot, smut and yellow spot. Data were analyzed under Crossed Frequency-Square Chi method. Results obtained showed that the experimental cultivar V99-260 is highly resistant to the diseases evaluated. The cultivars V99-250 and V99-258 behaved highly resistant to the rust. The cultivar My55-14 showed the high resistance for the pokkah boeng like V90-14, V99-8, V99-261 and V99-263. All the cultivars had a behavior of high resistance for ring spot, smut and yellow spot. The harvest frequencies between four and six months presented the smaller incidence degrees. The reached incidence degrees did not cause damages to the cultivation like forage because in the foliar surface of plants remains photosynthetically active areas.

Palabras clave : rust; pokkah boeng; ring spot; smut; yellow spot.