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PROVE PRELIMINARI DI LABORATORIO PER IL CONTROLLO DELLE ALGHE DELLA RISAIA

M. BISIACH
Rivista di Patologia Vegetale
Serie IV, Vol. 8, No. 2 (Aprile-Giugno 1972), pp. 159-181
Stable URL: http://www.jstor.org/stable/42556568
Page Count: 23
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
PROVE PRELIMINARI DI LABORATORIO PER IL CONTROLLO DELLE ALGHE DELLA RISAIA
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Abstract

E' descritto un metodo di prova preliminare «in vitro» per determinare l'attività algicida e algistatica di composti chimici contro le più eomuni forme algali infestanti della risaia. Su Spirogyra sp., Oedogonium sp. e Hydrodictyon rcticulatum, sono stati saggiati Benzuride, Captafol, HOE 2997, Folpet e KMnO₄ alle concentrazioni di 0,5 - 1 - 2 - 4 - 8 ppm. Tutti i prodotti ad eccezione di Benzuride hanno most rato una spiccata attività algicida. In particolare HOE 2997 (2, dicloro-acetamide-3 cloro-1,4-naftochinone) possiede una completa attività algicida e 1 ppm contro Oedogonium sp. e Hydrodictyon reticulatum e a 2-4 ppm contro Spirogyra sp. II derivato naftochinonico non è fitotossico per il riso ed in considerazione della sua elevatissima DL₅₀ (11.700-15.000 mg/Kg) apre nuove interessanti prospettive nella lotta antialgale in risaia. A method of preliminary «in vitro» test to determine algicidal and algistatic activity of chemical compounds against the most common algal forms infesting rice-fields is here described. Against Spirogyra sp., Oedogonium sp. and Hydrodictyon reticulatum, the following chemicals have been tested : Benzuride, Captafol, HOE 2997, Folpet and KMnO₄ at the concentrations 0.5 - 1 - 2 - 4 - 8 ppm. All the chemicals except Benzuride showed a marked algicidal activity. Particularly HOE 2997 (2, dichloroacetamido-3,chloro,1,4naphtoquinone) has a complete algicidal activity at 1 ppm against Oedogonium sp. and Hydrodictyon reticulatum and at 2-4 ppm against Spirogyra. The napthoquinone derivative is not phytotoxic for rice and on account of its very high DL₅₀ (11,700-15,000 mg/Kg) opens new interesting perspectives for the control of algae in rice-fields.

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