Comparative trials of four potassium phosphite formulations against chestnut ink disease by trunk injection
2015
Maso, Elisa Dal (Università degli Studi di Padova, Legnaro (Italy). Dipartimento Territorio e Sistemi Agro-Forestali) | Montecchio, Lucio (Università degli Studi di Padova, Legnaro (Italy). Dipartimento Territorio e Sistemi Agro-Forestali)
Ink disease, caused by Phytophthora cinnamomi and P. cambivora, is one of the most destructive diseases affecting Castanea sativa. Currently, disease control requires careful integrated chemical and agronomic measures. Trunk injection with potassium phosphite was shown as curative in reducing symptoms expression but little is known about the ideal formulation. In this research, fifty asymptomatic sweet chestnuts were inoculated with a local strain of P. cinnamomi isolated from an infected chestnut. Subsequently, trees were injected with four formulations of potassium phosphite. In comparison with water treatment, after 50 days the growth of the necroses was significantly slowed down only by one formulation, consisting in potassium phosphite added with a micronutrient solution. The results increase the knowledge base on the efficacy of endotherapic treatments against chestnut ink disease.
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