%0 Journal Article
%T Incidencia del saltahojas verde de la ca£¿a en siete cultivares de ca£¿a de az¨²car, Estado T¨¢chira, Venezuela
%A Giraldo-Vanegas
%A Humberto
%A Nass
%A Herman
%A Hern¨¢ndez
%A Edith
%A Amaya
%A Freddy
%A Vargas
%A Alvaro
%A Ram¨ªrez
%A Miguel
%A Ram¨ªrez
%A Freddy
%A Ram¨®n
%A Miguel
%A Lindarte
%A Jos¨¦ O
%J Agronom¨ªa Tropical
%D 2005
%I Scientific Electronic Library Online
%X the green leafhopper, saccharosydne saccharivora, is the most important pest in the sugarcane crop of san antonio-ure£¿a valley in t¨¢chira state, venezuela. it is able to affect plants under six months of age, inducing direct and indirect damage. lately, it was found that the insect is a vector for yellow leaf syndrome. consequently, a screening of the inia sugar cane collection at t¨¢chira state for its reaction to the insect was a critical goal to achieve. the collection is located at the experimental farm of the t¨¢chira sugar mill (cazta) at san antonio- ure£¿a valley and includes cultivars b 80-529, b 67-49, b 74-118, b 80- 549, v 75-6, b 81-494 and v 71-39, which were evaluated. experimental design was a random block with four repetitions and seven treatments. eight weekly evaluations of leafhopper populations were conducted on first ratoon three month old plants from february to april 2003 where a scale ranging from 0% (absence of insect) to 100% (the whole leaf cover by leafhoppers) was used. anova and tukey tests were conducted by infostat program. results indicated significant differences (p<0,05) between cultivars for weekly evaluations and total averages. b 80-529 and b 67-49 had the lowest mean incidence (10% and 25,46% respectively) while b 81-494 and v 71-39 resulted with the highest means (56,12% and 56,33%). the highest values for b 81-494 and v 71-39 (81,33% and 79,33%) occurred during the third and fourth week (18/ 03/2003) when the lowest rain and relative humidity levels were observed. these results suggest the existence of a biotic factor in b 80- 529 and b 67-49 which deters leafhopper development as well a negative effect of rain on insect population.
%K saccharosydne saccharivora
%K saccharum spp.
%K population levels
%K incidence
%K promissory varieties
%K sugarcane.
%U http://www.scielo.org.ve/scielo.php?script=sci_abstract&pid=S0002-192X2005000400006&lng=en&nrm=iso&tlng=en