Comparative Activity of Dexon and Terrazole against Phytophthora and Pythium

Wheeler, J. E.

doi:10.1094/phyto-60-561

Cited by 5 publications

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“…Con relación al control químico de la pudrición radical de la papaya, en Costa Rica no se han realizado experimentos que midan el efecto de los productos químicos sobre este patógeno. A nivel internacional hay pocos experimentos que evalúen este aspecto (Wheeler et al, 1970).…”

Section: Introductionunclassified

Combate integrado de la pudrición radical de la papaya (Phytophthora sp.) a nivel de vivero.

2016

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The effect of several strategies - alone and integrated - on the control of the Phytophthora sp. fungae, which causes radical rotting of papaya fruits, was evaluated under nursery conditions. The experiment took place between August 1994 and March 1995 at the University of Costa Rica's Estación Experimental Fabio Baudrit, located in Alajuela, Costa Rica. The treatments applied were: sun heat for 30 days; organic fertilizer made from hen droppings; etridiazole fungicide; and the following combinations: sun heat + etridiazole + organic fertilizer; etridiazole + organic fertilizer; sun heat + etridiazole; sun heat + etridiazole + organic fertilizer, and finally, an inoculated control treatment. Soil rows were made, and then they were innoculated with the pathogenic agent, and finally the aforementioned treatments were applied. The treated soils were bagged separately. The Solo Sunrise Hawaiian variety was planted in bags. The percentage of gerrnination, stem diameter at soillevel, plant height, radical system fresh weight, and severity of radical rotting were evaluated three months later. In addition, the effect of the treatments on beneficent soil microorganism populations (actinomyces, protozoa, bacteria, and fungi) was evaluated, as well as those of pathogenic populations. Organic fertilizer increased plant strength. All treatments affected germination; the innoculated control had the greatest germination percentage. Treatments containing organic fertilizer affected germination most.

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Section: Introductionunclassified

Combate integrado de la pudrición radical de la papaya (Phytophthora sp.) a nivel de vivero.

2016

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Wirkungsmechanismus von Terrazol

Lyr

Laussmann

Casperson

1975

J of Basic Microbiology

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Higher concentrations of terrazol inhibit the growth of a large number of fungi, but oomycetes are most sensitive. At medium concentrations (ED,, = 10 ppm) in Nucor mucedo several alterations of ultrastructure are recognizable even after short incubation periods. Significant observations are vacuolization of the mitochondria1 cristae, invagination of the cytoplasmic membrane, and thickening of the cell wall. Later on, numerous vacuoles in the cytoplasm are visible. Primary effects on the cell membrane (destructive effect), on 0,-consumption, on fermentation, or on nucleic acid synthesis could not be demonstrated. Lipid synthesis under the influence of terrazol showed characteristic changes. The synthesis of triglycerides and sterolesters was inhibited while the synthesis of free fatty acids and phospholipids was stimulated. Addition of lipids, vitamines, amino acids, or nucleic acids did not counteract the effect of terrazol. Further investigations are necessary t o elucidate the primary mechanism of action.

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Wirkungsmechanismus von Terrazol

1975

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Higher concentrations of terrazol inhibit the growth of a large number of fungi, but oomycetes are most sensitive. At medium concentrations (ED50 = 10 ppm) in Mucor mucedor several alterations of ultrastructure are recognizable even after short incubation periods. Significant observations are vacuolization of the mitochondrial cristae, invagination of the cytoplasmic membrane, and thickening of the cell wall. Later on, numerous vacuoles in the cytoplasm are visible. Primary effects on the cell membrane (destructive effect), on O2-consumption, on fermentation, or on nucleic acid synthesis could not be demonstrated. Lipid synthesis under the influence of terrazol showed characteristic changes. The synthesis of triglycerides and sterolesters was inhibited while the synthesis of free fatty acids and phospholipids was stimulated. Addition of lipids, vitamines, amino acids, or nucleic acids did not counteract the effect of terrazol. Further investigations are necessary to elucidate the primary mechanism of action.

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Comparative Activity of Dexon and Terrazole against Phytophthora and Pythium

Cited by 5 publications

References 0 publications

Combate integrado de la pudrición radical de la papaya (Phytophthora sp.) a nivel de vivero.

Combate integrado de la pudrición radical de la papaya (Phytophthora sp.) a nivel de vivero.

Wirkungsmechanismus von Terrazol

Wirkungsmechanismus von Terrazol

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