Evaluation of resistance in dwarf cashew to gummosis in north-eastern Brazil

Cardoso, J. E.; Paiva, João Rodrigues de; Cavalcanti, José Jaime Vasconcelos; Santos, A. A. dos; Vidal, J. C.

doi:10.1016/j.cropro.2005.11.010

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…It is very probable that these differences are associated to the different disease reactions by the clones studied. Resistant reaction of BRS 226 early described (Cardoso et al 2006;Paiva et al 2008) was confirmed (Figs 2-4). Clone Embrapa 51, which had no previous known reaction, showed a moderate resistance as it only reached approximately 20% incidence by the end of evaluation period.…”

Section: Discussionsupporting

confidence: 63%

“…Cashew gummosis is a relatively new and potentially important disease in semi‐arid growing region in Brazil. In spite of the importance of this pathossystem, very few scientific data has been reported on its epidemiology (Cardoso et al. 1998, 2006; Freire et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Cashew gummosis is a relatively new and potentially important disease in semi-arid growing region in Brazil. In spite of the importance of this pathossystem, very few scientific data has been reported on its epidemiology (Cardoso et al 1998(Cardoso et al , 2006Freire et al 2002), therefore even basic questions such as mechanisms of dispersal, movement of infectious units or source of primary inoculum remain unknown. Early observations suggested that the fungus may be introduced into the orchard by latent propagules presented in seedlings, scions or rootstocks of planting materials (authorsÕ personal communications).…”

Section: Discussionmentioning

confidence: 99%

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Spatial-temporal Analysis of Gummosis in Three Cashew Clones at Northeastern Brazil

Cysne

Cardoso

Maia

et al. 2010

Journal of Phytopathology

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The cashew gummosis caused by the fungus Lasiodiplodia theobromae is one of the most important disease of cashew in the northeast of Brazil. The lack of studies about method of early detection, pathogen dissemination, host predisposition, mechanisms of attack and defence and efficient control measures assures this disease as a limiting factor as to growing of cashew under semi-arid conditions. Therefore, the characterization of spatial patterns of gummosis development under commercial orchards may provide important insights into the mechanisms involving in dissemination and disease progress of this disease, as well as in the understanding of dynamic of host, pathogen and environmental interactions for this pathossystem. This work aimed to characterize gummosis temporal and special dynamics in three commercial orchards of cashew clones of cashew with different levels of susceptibility by studying the special arrangement of diseased plants. Disease incidence and severity, quantified determined by a descriptive scale in clones BRS 226 (resistant), Embrapa 51 (slightly resistant) and Faga 11 (susceptible) in a commercial orchard located in Pio IX district (Piaui state, Brazil), were monitored and mapped. Data were collected within three blocks of 90 plants for each clone. Indices of dispersion were estimated to study the spatial dynamic. The dynamics and structure of gummosis foci were also analysed. As expected, data showed different degrees of gummosis incidence and severity for the three clones. Even under different levels of disease, a random dispersion pattern model of dispersion could be observed at the beginning of epidemic for all clones. However, as disease develops, a clustered model is likely to fit. The increase in disease incidence resulted from the increasing in both focus number and size.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Spatial-temporal Analysis of Gummosis in Three Cashew Clones at Northeastern Brazil

Cysne

Cardoso

Maia

et al. 2010

Journal of Phytopathology

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“…Os genótipos de cajueiro apresentam diferenças na reação quanto à resinose, ensejando a seleção de indivíduos resistentes como BRS 226-Planalto e Embrapa 51, ambos selecionados na região semiá-rida (PAIVA, et al, 2002;CARDOSO et al, 2006CARDOSO et al, e 2007. Entretanto, entre os aspectos que contribuem para a ocorrência de severas epidemias da resinose no Semiárido Nordestino, destacam-se a expansão do cultivo com uso do clone suscetível "CCP 76", a falta de estudos epidemiológicos relacionados ao manejo integrado, incluindo-se estudos de interações genotípicas do enxerto e porta-enxerto e a falta de um método de detecção precoce da presença do fungo nos propágulos usados para a produção da muda.…”

Section: Introductionunclassified

Interação enxerto e porta-enxerto na incidência da resinose do cajueiro

et al. 2010

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RESUMO -A expansão do cajueiro-anão-precoce no Brasil vem promovendo baixa diversidade genética dos genótipos usados como enxerto e porta-enxerto, ensejando vulnerabilidade da cultura às vicissitudes bióticas como a resinose (Lasiodiplodia theobromae), principal doença do cajueiro no semiárido nordestino. Estima-se que cerca de meio milhão de mudas de cajueiro-anão-precoce sejam produzidas anualmente, sendo a grande maioria delas produzida de propágulos enxertados sobre plântulas oriundas de sementes do clone CCP 06. A principal estratégia de manejo da resinose é o plantio de clones resistentes. Entretanto, entre os aspectos que contribuem para sucessivas epidemias da resinose, destaca-se a falta de estudos de interações genotípicas entre enxerto e porta-enxerto. Este estudo objetivou avaliar o efeito de combinações de clones de cajueiro-anão-precoce usados como enxerto e porta-enxerto na incidência da resinose. Sementes de plantas de polinização aberta de seis clones selecionados foram usadas para produção de porta-enxerto. Os clones comerciais CCP 76 (suscetível) e BRS 226 (resistente) foram usados como enxertos. O experimento foi realizado obedecendo ao delineamento de blocos ao acaso, no esquema fatorial 2 x 6, com quatro repetições e nove plantas por parcela do tipo quadrada, sob condições de elevada pressão da doença, em Pio IX-PI. Três anos após o plantio definitivo, a incidência (I) e a severidade (S) (escala de 0 a 4) da resinose foram superiores no clone CCP 76 (I = 97% e S=2,10) em relação ao BRS 226 (I = 33% e S=0,36), independentemente do porta-enxerto. O clone CP 06 como porta-enxerto foi o único que reduziu a incidência e a severidade da resinose, independentemente do genótipo do enxerto. Este clone foi capaz de reduzir a severidade da resinose do clone CCP 76 (S=2,10) como enxerto em quase 30%. Termos para indexação: Lasiodiplodia theobromae, Anacardium occidentale, resistência genética. EFFECT OF CASHEW CLONE USED AS ROOTSTOCKS AND SCIONS ON GUMMOSIS INCIDENCE IN CASHEW PLANTSABSTRACT -The expansion of early dwarf cashew (EDC) crop in Brazil has promoted a reduced genetic diversity of cashew genotypes used to both as scion and root-stock. This may contribute to enhance crop vulnerability to some biological harm such as the infection by the gummosis fungus agent, Lasiodiplodia theobromae, the most important disease of this plant in semi-arid north-eastern Brazil. It has been estimated that half a million graft plants of EDC are yearly produced in Brazil, most of them obtained by grafting over seedling from CCP 06 clone as root-stock. The only means of managing gummosis is by the use of genetically resistant clones. However, the lack of studies on the scion and stock genotypic interactions has contributed to outbreak of successive gummosis epidemics. This study was developed in order to evaluate the effect of different combinations of EDC clones used as scion and stock on gummosis incidence. Rootstocks, prepared from seeds of six open pollinated plants, were grafted with two commercial clones: CCP...

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