Abstract
Aqueous solutions of 1·0 or 10·0 g a.i/l of phosphorous acid (H 3PO 3) 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. H 3PO 3/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. H 3PO 3/l or drenches of 20 g a.i. H 3PO 3/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 H 3PO 3 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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