|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 70 van 185 gevonden artikelen
| Titel: |
Evaluación de cultivares de maní (Arachis hypogaea L.) sin la aplicación de fungicidas en época de lluvias |
| Auteur: |
Jesús Rafael MÉNDEZ NATERA Dannacé OSORIO Jesús Rafael CEDEÑO |
| Verschenen in: |
Revista científica UDO agrícola |
| Paginering: | Jaargang 3 (2003) nr. 1 pagina's 47-58 |
| Jaar: |
2003 |
| Inhoud: |
In the 70’s and 80’, peanut or groundnut crop constituted one of the main oil crops in the Oriental Region of Venezuela,unfortunately the presence of the fungi Cercospora arachidicola and Cercosporidium personatum, causal agents of theearly and late leaf spot, respectively, caused a sharp decreasing of the nut yields, consequently the use of differentfungicides to control of these foliar diseases were applied, in only one crop season up to ten fungicides application wereused, increasing the production costs up to non financial limits, in the other hand, these fungicide applications caused aenvironment deterioration for the heavy quantity of the toxic product applied. For these reasons, the peanut cultivarevaluation is necessary to select tolerant or resistant genotypes to the foliar spots caused by these fungi and this is the mainobjective of the present work, and evaluate agronomically 25 genotypes of this crop. The experiment was carried out at theEstación experimental de Sabana de la Universidad de Oriente in Jusepin, Monagas state, Venezuela. During the seasoncrop (109 days) a rain of 258.4 mm was registered, the minimum temperature was 22.7 ºC and the maximum temperaturewas 30.4 ºC and the mean temperature was 26.3 º. A 5 x 5 triple lattice design was used with three replications. TheDuncan’s Multiple Range Test was used to detect differences among genotypes (p ≤ 0.05). Twenty two confectionery were sowed. The disease tolerance was evaluated according to Giandiana’s scale. Significant differences were found forfruit and nut yield/ha, numbers of fruit in 100 grams, 100-fruit weight, numbers of fruits and seeds/plant, numbers ofseeds/fruit and numbers of seed in 100 fruits and there were not significant differences for 100-seed weight, oil content andempty fruit percentage. The biggest nut yield/ha was for Indian cultivar 84448, being similar to the yields of other thirteengenotypes but superior to the other eleven genotypes. All genotypes had a value of four in the Giandiana’s scale, id est,there were classified as susceptible (more than three lesions which can reach the petiole, but not the stem) to leaf spot in theevaluations carried out at 82 and 89 days after sowing. These results indicated nut yield differences among genotypes inspite of there was not differences in the susceptibility to the disease, this suggested that the more yielder cultivars weretolerant to leaf spot, so that, exist the possibility of get tolerant genetic materials trough a breeding program of peanut cropwith the cultivars evaluated in this assay. |
| Uitgever: |
Universidad de Oriente Press (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 70 van 185 gevonden artikelen
| << vorige | volgende >> |