Reação de genótipos de melancia ao crestamento gomoso do caule

Santos, Gil Rodrigues dos; Filho, Adalberto Corrêa Café

doi:10.1590/s0102-05362005000400017

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…The high susceptibility of watermelon cv. Crimson Sweet to gummy stem blight earlier described (Santos and Café‐Filho, 2005) has been confirmed. Fungal isolates from melon and Cucurbita hosts infected most of the hosts tested here, and were the most aggressive isolates, while the isolates from watermelon were generally less aggressive or did not infect the Cucurbita hosts.…”

Section: Discussionsupporting

confidence: 64%

“…Didymella bryoniae is homothallic (Chiu and Walker, 1949) and produces the teleomorphic phase in culture (Corlett, 1981) and in the field (Schenck, 1968). Variation in host resistance has been found in several cucurbit hosts, such as cucumber (Sitterly, 1972; Wehner and St Amand, 1993), watermelon (Norton et al., 1986; Sumner and Hall, 1993; Dias et al., 1996; Santos and Café‐Filho, 2005) and melon (Norton and Cosper, 1989; McGrath et al., 1993). However, commercial cultivars with acceptable levels of resistance have not as yet been developed (Sitterly and Keinath, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Host Specificity and Genetic Diversity of Didymella bryoniae from Cucurbitaceae in Brazil

Santos¹,

Ferreira²,

Pessoa-Filho³

et al. 2009

Journal of Phytopathology

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Thirty-seven isolates of Didymella bryoniae from three Cucurbitaceae species were collected in Brazil and tested for pathogenicity to watermelon. All isolates were pathogenic but differed in aggressiveness levels. Seven representative isolates were used in cross-pathogenicity tests against 10 cucurbitaceous hosts. Most isolates were pathogenic to most host species tested, except to Sechium edule. Among the susceptible species, Citrullus and Cucumis species were the most susceptible hosts, while pumpkin and Luffa purgans were the most resistant. Host of origin affected the pattern of aggressiveness on each host. Isolates from watermelon were very aggressive to their original host, but much less aggressive or not pathogenic at all to some Cucurbita. Two previously described random-amplified polymorphic DNA (RAPD)-specific primers indicated that 81% of the isolates could be classified into the so-called RG I group, while the remaining isolates could not be classified into any of the described RG groups. All 37 isolates were further characterized by RAPD fingerprinting and compared with three US isolates representative of RG I and RG II groups. The Brazilian D. bryoniae isolates could be separated into genetically similar clusters. The majority of the isolates were grouped in cluster DB Ia, which contained only isolates of Citrullus lanatus and Cucumis melo. Two of the American isolates used as controls clustered with this group at 68% similarity level. The DB Ib cluster included three Brazilian isolates obtained from melon and watermelon and the American representative for RG II, at a lower similarity level (43%). Two isolates from watermelon clustered with one isolate from melon in a separate group (DB II), while one single isolate from pumpkin (DB III) showed the lowest genetic similarity to all other isolates. Didymella bryoniae isolates from Brazil showed, therefore, a level of genetic diversity higher than previously reported for the species. RAPD fingerprinting allowed for geographical distinction of D. bryoniae isolates but no correlation between genetic distance, aggressiveness or origin of the isolate was found.

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Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Host Specificity and Genetic Diversity of Didymella bryoniae from Cucurbitaceae in Brazil

Santos¹,

Ferreira²,

Pessoa-Filho³

et al. 2009

Journal of Phytopathology

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“…It causes damping-off, foliar lesions and stem and stalk cankers, which compromise the plant development, reducing productivity and quality of the fruits (Santos & Café Filho, 2005). Recently, Aveskamp et al (2010) proposed a new nomenclature for D. bryoniae, which was defined as Stagonosporopsis cucurbitacearum and anamorph in Phoma cucurbitacearum (Brewer et al, 2015).…”

Section: Received On December 2 2016; Accepted On August 8 2017mentioning

confidence: 99%

Severity of gummy stem blight on melon in relation to cultivars, use of fungicides and growing season

et al. 2017

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The authors aimed to evaluate the resistance to gummy stem blight and the agronomic traits of the melon crop in the Southern Region of the State of Tocantins, Brazil, in two growing seasons, submitted or not to treatment with fungicides. Two experiments were carried out: dry season (experiment I), and rainy season (experiment II), respectively, comprising the periods from July to October 2013 and from March to May 2014. Six melon cultivars were used in each season. In the dry season: Eldorado 300, Hibrix, Dourado Amarelo, Louro, Gaúcho Redondo and Canarian; and in the rainy season: Eldorado 300, Hibrix, HF-4439, Louro, Gaúcho Redondo and Canarian. Treatments consisted of each cultivar and split plot with (WA) or without fungicides application (NA). All cultivars were susceptible to disease, considering that Gaúcho Redondo was the least susceptible in the dry season. The fungicide application decreased disease severity in the dry season, however the productivity of the crop in treatments without fungicide application were not compromised, due to the late onset of the disease, and ranged from 19.2 t/ha for Eldorado 300 up to 41.9 t/ha for Canarian. The total soluble solids showed average values of 12°Brix, except for cultivar Gaúcho Redondo, which showed Brix value lower than commercial standards. During the rainy season, fungicide application did not protect the plants, which did not complete the cycle, resulting in the absence of marketable fruit production. The climatic characteristics observed in the rainy season, with high humidity, leaf wetness and high temperatures are favorable for the development of gummy stem blight in melon plants. Thus, in Tocantins, the dry season is characterized as the best time of year for cultivation, between April and September.

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“…To this end, we carried out a evaluation 20 days after inoculation, assigning grades 1-7, based on the diagrammatic scale Santos and Café-Filho (2005), with the following modifications: note 1 -healthy plant; note 2 -plants with up to 5% of lesions per leaf; note 3 -plant with 6 to 10% of lesions per leaf; note 4 -plants with 11 to 25% of lesions per leaf; note 5 -plants with 26 to 50% of lesions per leaf; note 6 -plants with 51 to 75% of injuries and note 7 -76 to 90%. Data were subjected to analysis of variance and means compared by Tukey test at 5% probability.…”

Section: Methodsmentioning

confidence: 99%

In vivo antifungal activity of neem oil and aqueous extracts against leaf spot disease caused by <i>Cercospora abelmoschii</i> on okra

Catarino¹,

Rodrigues²,

Queiroz³

et al. 2016

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The cercospora leaf spot, caused by Cercospora abelmoschi Ellis and Everhart, is quite common in okra culture. Therefore, this study aimed to evaluate the efficiency of aqueous extracts of neem (Azadirachta indica A. Juss), citronella (Cymbopogon nardus (L.) Rendle), eucalyptus (Eucalyptus grandis L.), ecolife®, A. indica oil and fungicide cercobin 700 PM® in control of cercospora leaf spot on okra in greenhouse. The extracts and neem oil were tested in concentration 10%, the fungicide cercobin 700PM® in dose 2.5 g.l -1 , applied 10 days after pathogen inoculation by leaf spray and the citric biomass extract ecolife® in concentration 5.0 ml.l -1

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Reação de genótipos de melancia ao crestamento gomoso do caule

Cited by 11 publications

References 12 publications

Host Specificity and Genetic Diversity of Didymella bryoniae from Cucurbitaceae in Brazil

Host Specificity and Genetic Diversity of Didymella bryoniae from Cucurbitaceae in Brazil

Severity of gummy stem blight on melon in relation to cultivars, use of fungicides and growing season

In vivo antifungal activity of neem oil and aqueous extracts against leaf spot disease caused by <i>Cercospora abelmoschii</i> on okra

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