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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Intensidade e controle de ferrugem em cultivares de Hemerocallis hibrida / Intensity and control of rust in Hemerocallis hibrida cultivars

Ribeiro, Roberta Sabatino 24 July 2012 (has links)
Made available in DSpace on 2016-12-08T16:44:42Z (GMT). No. of bitstreams: 1 PGPV12MA104.pdf: 3071931 bytes, checksum: 12c25e131b1ed773136ed462f974fe61 (MD5) Previous issue date: 2012-07-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The rust (Puccinia hemerocallidis Thuem) is the main disease of daylily. In Brazil, there are no registered fungicides to control this disease and there are no studies indicating the more resistant cultivars. The study aimed to verify, on field conditions, the effectiveness of fungicides mixtures and rock dust on the control of rust and on the agronomic characteristics of five cultivars the daylily, identify the resistance degree of this cultivars to rust, as well to verify, in vitro, the efficacy of seven fungicides and rock dust on the germination inhibition of P. hemerocallidis urediniospore. The experiments were conducted at the Center of Agroveterinaries Sciences, CAV/UDESC in Lages, SC. On field conditions evaluated the cultivars Cora Offer, Daniela Esther Nass, Hariet, Margaret Mee and São Paulo and the products rock dust, pyraclostrobin + epoxiconazole, trifloxystrobin + tebuconazole, picoxystrobin + cyproconazole and azoxystrobin + cyproconazole. The fungicides were applied every thirty days for a total of three applications and the rock dust was applied every seven days for a total of thirteen applications. Weekly were quantified the incidence and severity of rust on leaves and through these data were calculated the Area Under Disease Progress Curve (AUDPC). It was also evaluated number of leaves, of flowers and of tillers. It was observed that all mixtures of fungicides reduced the disease incidence and severity, as well, delayed leaf senescence process. The mixtures pyraclostrobin + epoxiconazole, trifloxystrobin + tebuconazole and picoxystrobin + cyproconazole provided higher number of flowers the plants. The rock dust reduced the severity of the disease, but had lowest control in relation to fungicides mixtures, besides had not increased in none agronomic characteristics. The cultivar Daniela Esther Nass had the lowest incidence and severity of rust and the smallest reduction in number of leaves. The cultivar Daniela Esther Nass was classified as moderately resistant/resistant to rust, the Cora Offer as moderately susceptible/ susceptible, the Hariet and Margaret Mee as susceptible, and São Paulo as very susceptible. In the in vitro assay were evaluated the products azoxystrobin, picoxystrobin, pyraclostrobin, trifloxystrobin, cyproconazole, epoxiconazole, tebuconazole and rock dust at concentrations of 0, 0.01, 0.1, 1, 10 and 100 mg L-1. The products were diluted and mixed in a water-agar media, and stored at 4°C for 24 hours. Was added 0.5 mL of a suspension containing urediniospore of P. hemerocallidis and the incubation was at 22°C, in the dark, for 6 hours. The IC50 values were within the range of 0.01 to 0.1 mg L-1 for fungicides of the strobilurin chemical group; between 0.1 and 1 mg L-1 to tebuconazole; between 1 and 10 mg. L-1 to epoxiconazole, and between 10 and 100 mg. L-1 to cyproconazole and rock dust. The CI100 was observed only in fungicides azoxystrobin and picoxystrobin. It was concluded that all fungicides of the strobilurin chemical group and tebuconazole showed highly toxicity to urediniospores of the P. hemerocallidis, and fungicides epoxiconazole and cyproconazole, such as the rock dust had moderately toxicity this pathogen / A ferrugem (Puccinia hemerocallidis) é a principal doença do hemerocale. No Brasil, não há fungicidas registrados para o controle desta doença e também não há trabalhos indicando quais as cultivares mais resistentes. O trabalho teve como objetivos verificar, a campo, a eficácia de mistura de fungicidas e do pó de rocha no controle da ferrugem e nas características agronômicas de cinco cultivares de hemerocale, identificar o grau de resistência destas cultivares à ferrugem e também verificar, in vitro, a eficácia de sete fungicidas e do pó de rocha na inibição da germinação de uredosporos de P. hemerocallidis. Os experimentos foram conduzidos no Centro de Ciências Agroveterinárias, CAV/UDESC, em Lages, SC. A campo, avaliou-se as cultivares Cora Offer, Daniela Esther Nass, Hariet, Margaret Mee e São Paulo e os produtos pó de rocha, piraclostrobina + epoxiconazol, trifloxistrobina + tebuconazol, picoxistrobina + ciproconazol e azoxistrobina + ciproconazol. Os fungicidas foram aplicados a cada trinta dias, num total de três aplicações e o pó de rocha a cada sete dias, num total de treze aplicações. Semanalmente quantificou-se a incidência e a severidade da ferrugem em folhas e através destas calculou-se a Área Abaixo da Curva de Progresso da Doença (AACPD). Avaliou-se ainda o número de folhas, de flores e de afilhos. Observou-se que todas as misturas de fungicidas reduziram a incidência e a severidade da ferrugem, bem como retardaram o processo de senescência das folhas. As misturas piraclostrobina + epoxiconazol, trifloxistrobina + tebuconazol e picoxistrobina + ciproconazol propiciaram maior número de flores as plantas. O pó de rocha reduziu a severidade da doença, mas apresentou menor controle em relação as misturas de fungicidas, além disso, não apresentou incremento em nenhuma característica agronômica. A cultivar Daniela Esther Nass apresentou a menor incidência e severidade à ferrugem e a menor redução no número de folhas. A cultivar Daniela Esther Nass foi classificada como moderadamente resistente/resistente à ferrugem, a Cora Offer como moderadamente suscetível/suscetível, a Hariet e a Margaret Mee como suscetíveis, e a São Paulo como altamente suscetível. No ensaio in vitro foram avaliados os produtos azoxistrobina, picoxistrobina, piraclostrobina, trifloxistrobina, ciproconazol, epoxiconazol, tebuconazol e pó de rocha nas concentrações de 0; 0,01; 0,1; 1; 10 e 100 mg.L-1. Os produtos foram diluídos e misturados em meio de ágar-água e armazenadas a 4ºC durante 24 horas. Adicionou-se 0,5 mL de uma suspensão contendo uredosporos de P. hemerocallidis e a incubação foi a 22ºC, no escuro, durante 6 horas. As CI50 ficaram num intervalo entre 0,01 e 0,1 mg.L-1 para os fungicidas do grupo químico das estrobilurinas; entre 0,1 e 1 mg.L-1 para o tebuconazol; entre 1 e 10 mg.L-1 para o epoxiconazol; e entre 10 e 100 mg. L-1 para o ciproconazol e o pó de rocha. A CI100 foi observada apenas nos fungicidas azoxistrobina e picoxistrobina. Todos os fungicidas do grupo químico das estrobilurinas e o tebuconazol apresentaram elevada fungitoxicidade a uredosporos de P. hemerocallidis; e os fungicidas ciproconazol e epoxiconazol, bem como o pó de rocha apresentaram ação moderadamente fungitóxica a este patógeno

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