ISSN 1392-0200
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2003 m. Nr. 1
Effect of benzotiadiazole on phytopathological and physiological processes in tomato
Elena Survilienė, Aušra Brazaitytė, Alma Šidlauskienė.
The modern plant protection system
has involved the new means that act not directly on fungi and
bacteria, but activate the natural defense mechanisms of the plant and enhance the
same physiological and biochemical changes in plants as does the
biological systemic activated resistance. In 1999–2000, the role of the plant
activator Bion (benzothiadiazole) in the resistance of tomato against early
blight (Alternaria solani) and late blight (Phytophthora infestans) was
investigated at the Lithuanian Institute of Horticulture. Physiological and
phytopathological observations were carried out on greenhouse tomato
Aušriai exposed to Bion. The data showed that the plant activator Bion and
the fungicide Euparen (tolylfluanid) reduced early blight incidence by
10.35% and late blight by 34.5% in comparison with untreated plants.
Application of the plant activator and the fungicide increased tomato
yield by 4.5 kg/m2 and exhibited a rather high biological efficiency
(42–63%).
Tomato sprayed with Bion
accumulated insignificantly more pigments in leaves at a normal temperature.
Under these conditions other physiological processes were similar. At
a high temperature the physiological processes were more intensive in
tomatoes sprayed with Bion than in non-sprayed ones.
Keywords: Solanum lycopersicum L., Alternaria solani, Phytophthora infestans, benzothiadiazole, tolylfluanid, pigments, phytomonitoring, photosynthesis
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