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ISHS Acta Horticulturae 808: II International Symposium on Tomato Diseases

MANDIPROPAMID: NEW FUNGICIDE AGAINST PHYTOPHTHORA INFESTANS ON TOMATO

Authors:   A. Fanigliulo, M. Sacchetti
Keywords:   tomato, Mandipropamid, Phytophthora infestans
DOI:   10.17660/ActaHortic.2009.808.58
Abstract:
Mandipropamid is a new fungicide developed by Syngenta, belonging to the chemical class of the mandelamides. It is effective against spore germination, mycelial growth and sporulation. It is recommended as preventive treatments but also provides curative activity during the incubation period. After foliar application, a large amount of the active ingredient is absorbed in the cuticular wax layer ensuring excellent rainfastness. The uptake into plant tissues is sufficient to provide good translaminar activity. During 2006 and 2007 summers, experimentation was performed, according to EPPO guidelines and Principles of Good Experimental Practice (GEP), aiming at establishing the biological efficacy and the selectivity of Mandipropamid + cupper oxychloride 2.50/13.95 (formulate A14781, Syngenta Crop Protection) on tomato against Phytophthora infestans. The study was performed in Muro Lucano (Potenza), southern Italy. Experimental design consisted in random blocks, in 4 repetitions. Two different dosages of the formulate were compared with two commercial formulates: Dimetomorf + cupper oxychloride 6.0/40.0 (Forum R, BASF) and Iprovalicarb + cupper oxychloride 4.20/20.3 (Melody Compact, Bayer Crop Science). Six foliage applications were applied every 7 days. The intensity and diffusion of the disease were evaluated both on leaves and on fruits. Eventual phytotoxic effects were also evaluated. Climatic conditions were optimal for disease development, so that P. infestans completely destroyed plants of the untreated controls. Experimental results show the excellent effectiveness and selectivity of mandipropamid. Formulate A14781, such as standard formulates used in comparison, showed to be effective in the control of the disease, highlighting a strong biological activity against P. infestans. The disease control was stronger when evaluated on the basis of symptoms on fruits. No effect of phytotoxicity was noticed, both on leaves and on fruits.

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