Preliminary evaluation of phosphorous acid, fosetyl-A1 and metalaxyl for controlling Phytophthora cambivora on almond and cherry
1988; Elsevier BV; Volume: 7; Issue: 5 Linguagem: Inglês
10.1016/0261-2194(88)90078-6
ISSN1873-6904
Autores Tópico(s)Yeasts and Rust Fungi Studies
ResumoAqueous solutions of 1·0 or 10·0 g a.i/l of phosphorous acid (H3PO3) neutralized with KOH and applied as a foliar spray or soil drench inhibited the development of stem lesions on potted almond and cherry plants inoculated with Phytophthora cambivora and in most cases were effective as either 0·25 g a.i./l metalaxyl or 3·2 g a.i./l fosetyl-A1 drenches. Sprays or drenches of 10 g a.i. H3PO3/l were phytotoxic to potted almonds causing marginal leaf scorch, leaf drop and brown necrotic lesions on young shoots. Foliar sprays of 1 g a.i. H3PO3/l or drenches of 20 g a.i. H3PO3/l were not phytotoxic to 4-year-old Mahaleb cherry trees and restricted lesions caused by P. cambivora for up to 17 weeks after application. A 10% neutralized solution of H3PO3 injected directly into the trunk of cherry trees inhibited P. cambivora lesions for a similar period but the treatment was initially phytotoxic.
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