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Panambi, Brazil

Galli J.A.,Polo Centro Norte APTA | Martins A.L.M.,Polo Centro Norte APTA | Ito M.F.,Instituto Agronomico IAC APTA | Braghini M.T.,Instituto Agronomico IAC APTA | And 2 more authors.
Revista Brasileira de Fruticultura | Year: 2011

The mango wilt is a disease caused by the fungus Ceratocystis spp., causing the death of mango trees in several Brazilian States. The objective of the present study was to evaluate the survival of varieties used as rootstocks under field and greenhouse conditions. Poliembrionic varieties were tested for resistance to Ceratocystis spp., with the inoculation method of the fungus in the soil in greenhouse. The surviving plants were planted in the Experimental Station of Pindorama and those considered promising were multiplied by grafting utilizing different rootstocks. After 17 years of the planting, an inventory of dead plants was made in the area. The rootstock Manila considered resistant to Ceratocystis had zero deaths and the rootstock Coquinho considered susceptible had 58.3% deaths. Two isolates of C. mangicola M. van Wyk and M.J. Wingf. were used to evaluate the varietal resistance in the greenhouse. The pathogen was cultivated in PDA medium and transferred for the liquid medium. Eight inoculations were accomplished with minimum 30 days interval using 5mL of the suspension. Dead plants were evaluated periodically. The experimental design used was completely randomized blocks, with 15 varieties and 4 replications. The method of inoculation with fungus suspension irrigated in the soil with 106 spores. mL-1 concentration confirmed to be efficient to select resistant rootstocks. The varieties Vitória, IAC 112, Dura and Bocado showed resistance to the isolates used in the experiment. The variety Juliana presented the same high degree of susceptibility of the variety Coquinho, both should be avoided in areas where the disease occurs. Source

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