Isolados de Dicyma pulvinata em estromas de Microcyclus ulei em seringueira

Mello, S. C. M.; Santos, Maria de Fátima; Silva, João Batista Tavares da

doi:10.1590/s0100-204x2006000200024

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…Consequently, it can only be applied in limited areas, such as bud wood gardens and nurseries (Gasparotto et al 1997). Although most studies attempting to solve this problem aim toward a genetic control of SALB, other alternatives have been envisaged, such as a biological control using the hyperparasite Dicyma pulvinata (Mello et al 2005(Mello et al , 2006Melo et al 2008), which colonizes M. ulei ascostromata. To develop a biologic control to Corynespora cassiicola, leaves of rubber trees treated with bacterial endophytes isolated from different organs of Hevea brasiliensis developed systemic tolerance (Shaji et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Foliar endophytic fungi from Hevea brasiliensis and their antagonism on Microcyclus ulei

et al. 2010

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Endophytic fungi live inside plants as symbionts for at least one period of their life cycle. They play an important role in plant defence and could be promising sources of valuable natural bioactive products. The present study aimed to select endophytic fungi antagonistic to Microcyclus ulei, the agent of South American Leaf Blight (SALB) responsible for the weak development of rubber plantations in Latin America. Endophytic fungi were isolated from leaves of three cultivars (FX3864, CDC312, MDF180) of Hevea brasiliensis (the rubber tree) with distinct resistance levels to the attack by Microcyclus ulei. Leaf samples were collected from a 5,000 ha area of the Michelin plantations (Igrapiúna, Bahia, Brazil). A total of 435 colonies of endophytic fungi were isolated, purified, and preserved in sterilized distilled water. Lyophilized culture filtrates obtained from 88 fungal isolates, grown in liquid malt extract medium, were tested in vitro at concentrations of 50% and 12.5% for their inhibitory potential against the germination of M. ulei PMB26 conidia. Thirteen filtered cultures of endophytic fungi that presented inhibitory activity above 80% (at the concentration 12.5%) were characterized taxonomically by sequencing the ITS regions of rDNA, revealing the following taxa: Fusarium sp., Gibberella sp., Glomerella cingulata, Microsphaeropsis sp., Myrothecium sp., Pestalotiopsis sp. and Phomopsis sp. Three taxa were detected only in the resistant cultivars: Microsphaeropsis sp., and Pestalotiopsis sp. in MDF180, and Myrothecium sp. in CDC312. The present work constitutes the first study showing inhibitory activity of rubber tree endophytic fungi on Microcyclus ulei. These results provide an encouraging basis for the identification of new bioactive molecules for an effective control of South American leaf blight.

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Section: Introductionmentioning

confidence: 99%

Foliar endophytic fungi from Hevea brasiliensis and their antagonism on Microcyclus ulei

et al. 2010

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“…Experimentos conduzidos em casa de vegetação por Mello et al (2006) Sucesso parcial do controle biológico tem sido observado em avaliações conduzidas em campo com diversos agentes de controle biológico (Mitchell et al, 1986;Kupper et al, 2003;Shternshis et al, 2005).…”

Section: Resultsunclassified

Compatibilidade de Dicyma pulvinata com defensivos agrícolas e eficiência do biocontrole do mal-das-folhas da seringueira em campo

Melo

Mello

Mattos

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar quatro isolados do fungo antagonista Dicyma pulvinata quanto à compatibilidade com defensivos agrícolas e adjuvantes, e a eficiência desses isolados no controle do mal-das-folhas (Microcyclus ulei) da seringueira (Hevea sp.) em campo. A compatibilidade dos isolados com defensivos e adjuvantes foi avaliada com base no crescimento micelial e na esporulação do fungo, em testes conduzidos in vitro. Para avaliação da eficiência do antagonista contra M. ulei, em campo, os quatros isolados do antagonista foram comparados ao controle exercido pelo tratamento com os fungicidas propiconazol + mancozeb. Compatibility of Dicyma pulvinata with pesticides and biocontrol efficiency of South American leaf blight of rubber tree under field conditionsAbstract -The objective of this work was to evaluate four isolates of the antagonist fungus Dicyma pulvinata in terms of its compatibility with chemical pesticides and adjuvants products, and the efficiency of these isolates as biocontrol agent against South American leaf blight (Microcyclus ulei) of rubber tree (Hevea sp.) under field conditions. Isolates compatibility with chemical pesticides and adjuvants was evaluated on mycelial growth and fungus sporulation in vitro. To assess the efficiency of the antagonist against M. ulei under field conditions, the four isolates were compared to the control by the fungicide mixture propiconazol + mancozeb. The assays showed incompatibility of the antagonistic fungus with the fungicides benomyl, carbendazim, mancozeb, propiconazol, besides the insecticide-acaricide endosulfan. Two of the adjuvants tested did not affect the fungus development. It was demonstrated the action of D. pulvinata against M. ulei, in the field, especially for the isolates CEN 62 and CEN 93, which showed control levels similar to the fungicide standard treatment.

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Stress in Plantation Crops: Adaptation and Management

Vinod

2011

Crop Stress and Its Management: Perspectives and Strategies

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Isolados de Dicyma pulvinata em estromas de Microcyclus ulei em seringueira

Cited by 5 publications

References 8 publications

Foliar endophytic fungi from Hevea brasiliensis and their antagonism on Microcyclus ulei

Foliar endophytic fungi from Hevea brasiliensis and their antagonism on Microcyclus ulei

Compatibilidade de Dicyma pulvinata com defensivos agrícolas e eficiência do biocontrole do mal-das-folhas da seringueira em campo

Stress in Plantation Crops: Adaptation and Management

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