Decline and death of young grapevines by infection of <i>Phoma glomerata</i> on the rootstock
DOI:
https://doi.org/10.5073/vitis.1981.20.341-346Abstract
Decline and death of young grapevines (Vitis vinifera L.) cultivar Italia, grafted on the rootstock V. berlandieri PLANCHON x V. rupestris SCHEELE 140 Ru., have been detected in a grape area of Sicily. The phenomena were initially characterized by necrotic areas on the rootstock and consequent scarce growth and progressive chlorosis of the leaves.
From the affected plants a fungus, identified as Phoma glomerata (CORDA) WOLLENW. et HOCHAPF. (= Peyronellaea glomerata (CORDA) GOIDANICH), has been consistently isolated. Such an isolate has reproduced the syndrome when inoculated on rooted cuttings of the rootstocks V. berlandieri x V. rupestris 140 Ru. and 1103 P., V. riparia MICHAuX x V. berlandieri KOBER 5BB and V. rupestris DU LOT. From the plants with artificial inoculations it was possible to reisolate the same fungus. On such a basis, P. glomerata has to be considered the causal agent of the disease. Infections take place through the wounds made on the young trunks by removing the rootstock spurs from the field-grafted plants.
In vitro assays have proved that the isolate of P. glomerata is quite sensitive to the fungicides Captafol, Ziram and Carbendazim.
Deperimenti di giovani piante di vite indotti da infezioni di Phoma glomerata
sul portinnesto
Su giovani piante di vite (Vitis vinifera L.) cv. Italia, innestate in campo sui portinnesti V. berlandieri PLANCHON X V. rupestris SCHEELE 140 Ru., sono stati notati - in un'area viticola della Sicilia - gravi fenomeni di deperimento. Le viti presentavano aree necrotiche sul portinnesto, con conseguente scarsa vegetazione e clorosi progressive delle foglie, a cui seguiva spesso la morte dell'intera pianta.
Dalle piante ammalate i;' stato costantemente isolato il fungo Phoma glomerata (CORDA) WOLLENW. et HOCHAPF. (= Peyronellaea glomerata (CORDA) GOIDANICH). L'isolato ha riprodotto la sindrome in seguito ad inoculazione artificiale, su barbatelle dei portinnesti V. berlandieri x V. rupestris 140 Ru. e 1103 P.; V. rupestris DU LOT e V. riparia MICHAUX x V. berlandieri KOBER 5BB. A distanza di tempo è stato possibile reisolare dalle piante con infezione artificiale lo stesso agente patogeno; P. glomerata è pertanto da considerare l'agente del deperimento delle giovani piante di vite. Si è potuto appurrare che l'infezione avviene attraverso la ferita praticata sul tronco per asportare lo sperone del portinnesto.
In prove in vitro, P. glomerata è risultato molto sensibile ai fungicidi Captafol, Ziram e Carbendazim.
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