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- Author or Editor: Laurel A. Giammichele x
Abstract
Metalaxyl, etridiazole, and captan were incorporated at 0, 50, 450, and 850 mg active ingredient per liter of magnesium silicate (Laponite 445) gel to ascertain fungicide efficacy in controlling damping-off [Pythium aphanidermatum (Edson) Fitzp.] in fluid-drilled ‘Heinz 1350’ tomato (Lycopersicon esculentum Mill.). Metalaxyl and etridiazole at 50 and 450 mg a.i./liter, respectively, gave percentage emergence values in infested growth media equal to those in control media. Captan at 850 mg a.i./liter gave lower percentage emergence values in Pythium-infested media than in control media. Thus, damping-off control efficacy was in the order metalaxyl > etridiazole > captan. Seedling growth reflected fungicide efficacy in controlling Pythium, since plant fresh weight and infection index values were inversely related. Fungicides incorporated in gel were nonphy to toxic.