ISHS Acta Horticulturae 795: V International Cherry Symposium
EVALUATION OF ROOTSTOCK AND MANAGEMENT PRACTICES TO AVOID CHERRY REPLANT DISEASE IN CHILE |
| Authors: | G. Reginato, C. Córdova, C. Mauro |
| Keywords: | Prunus avium, soil fumigation, waiting period, tree growth |
| Abstract:
Since spring 2002, several trials to evaluate growth of replanted sweet cherry (Prunus avium L.) trees have been conducted in Chile. Tree growth on methyl bromide-treated soil (Non-replant condition) was compared to growth on untreated soil. Tree growth as a function of trunk cross-sectional area (TCSA) was evaluated. In Rancagua (34°10’ S, 70°45’ W), 10 rootstocks were studied under replant conditions for an orchard grown previously on P. mahaleb (L.). All the rootstocks were affected in comparison to rootstocks grown in fumigated soil, with growth only 25 to 65% of the fumigated treatment. The rootstocks affected most were P. mahaleb, ‘Maxma 14’, ‘F 12-1’ and ‘Maxma 60’; ‘Gisela 6’, ‘Cab 6’, ‘Colt’ and ‘Gisela 5’ were affected to a lesser magnitude. Similar responses, with less affected trees, were also seen in Curicó (34°55’ S, 74°12’ W). Less affected vigorous rootstocks, growing in a replant soil, had tree growth similar to less vigorous rootstocks in a fumigated soil. Planting right after, or 1 or 2 years after, orchard removal also was evaluated; comparative tree growth values were 2.5:1 (fumigated:non-fumigated) for 0 or 1 year of waiting and 1.4:1 after 2 years of waiting. Methyl bromide and 1,3-dichloropropene (1,3-D) were better soil fumigants for cherry replant disease than chloropicrin (C) or 1,3-D plus C, which was intermediate between C or 1,3-D alone. | |
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