Articles
EVALUATION OF TOMATO HYBRIDS RESISTANT TO TSWV UNDER GREENHOUSE CONDITIONS IN ARGENTINA
Article number
559_115
Pages
775 – 779
Language
English
Abstract
Tomato spotted wilt causes serious economic losses in cultivated tomato (Lycopersicon esculentum Mill.) in Argentina.
The use of commercial hybrids with genetic resistance to TSWV is a mean of reducing the incidence of this disease.
Sixteen commercial cultivars with tolerance/resistance to TSWV, were evaluated under different greenhouse conditions from august 1996 to february 1997. Resistant hybrids showed lower TSWV incidence than susceptible ones but this performance was different in each environment.
In predisposing planting dates (late season and low vector control) the susceptible hybrid presented 80.3 % of incidence, vs. 1.6 % in the resistant hybrid and 5 % in the tolerant.
In preventive environments (early season and low vector population, or late season and adequate vector control) this differences were less evident (4.2 in the susceptible, 0.68 and 0.55 % of symptomatic plants at the susceptible, resistant and tolerant cv. respectively). When folioles with thrips injury/plant 30 days after transplanting was 12.2 (late season and low vector control), the higher values of incidence were obtained at the susceptible cultivar (88.4%) and tolerant (69%) cultivars; resistant materials showed lower values (12 %) but, high percentage of fruits with TSWV symptoms appeared.
Genetic resistance should be used in combination with other cultural practices (adequate vector control, weed control, physical barriers against vectors) in order to improve its results.
The use of commercial hybrids with genetic resistance to TSWV is a mean of reducing the incidence of this disease.
Sixteen commercial cultivars with tolerance/resistance to TSWV, were evaluated under different greenhouse conditions from august 1996 to february 1997. Resistant hybrids showed lower TSWV incidence than susceptible ones but this performance was different in each environment.
In predisposing planting dates (late season and low vector control) the susceptible hybrid presented 80.3 % of incidence, vs. 1.6 % in the resistant hybrid and 5 % in the tolerant.
In preventive environments (early season and low vector population, or late season and adequate vector control) this differences were less evident (4.2 in the susceptible, 0.68 and 0.55 % of symptomatic plants at the susceptible, resistant and tolerant cv. respectively). When folioles with thrips injury/plant 30 days after transplanting was 12.2 (late season and low vector control), the higher values of incidence were obtained at the susceptible cultivar (88.4%) and tolerant (69%) cultivars; resistant materials showed lower values (12 %) but, high percentage of fruits with TSWV symptoms appeared.
Genetic resistance should be used in combination with other cultural practices (adequate vector control, weed control, physical barriers against vectors) in order to improve its results.
Authors
M. Mitidieri, I. de Mitidieri, E. Dal Bó
Keywords
Tomato spotted wilt virus, cultivar trials
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