Performance of Dimethomorph + Mancozeb Applied to Seed Potatoes in Early Management of Late Blight (<Emphasis Type="Italic">Phytophthora infestans</Emphasis>) |
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Authors: | D O Caldiz D A Rolon J Di Rico A B Andreu |
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Institution: | (1) Agronomy Division, McCain Argentina SA, Ruta 226 km 61.500, B7620EMA Balcarce, Argentina;(2) BASF Argentina SA, Av. Corrientes 327, C1043AAD Ciudad Autónoma de Buenos Aires, Argentina;(3) Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata, Fúnes 3250, 7600 Mar del Plata, Argentina |
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Abstract: | Treating seed potatoes with contact fungicides prevents infection of Phytophthora infestans from tuber to tuber during handling but does not prevent field infections in the young plant. Dimethomorph (DMM) 9% + mancozeb
60% (Acrobat MZ, BASF) can cover both aspects due to the contact and systemic action of mancozeb and DMM, respectively. Experiments
were performed under greenhouse and field conditions (three seasons and two locations) with cvs Kennebec, Shepody, Spunta,
Russet Burbank, and Ranger Russet. Immediately after cutting, seed pieces were treated with Acrobat MZ at doses equivalent
to 2, 3, and 4 kg ha−1. At any dose, Acrobat MZ protected healthy seed tubers against P. infestans infections. Acrobat MZ (4 kg ha−1) also protected the foliage of all cultivars against artificial inoculation of P. infestans, assessed by the detached-leaf method. These effects were observed up to 30 days after emergence in greenhouse experiments
and up to 28 days after crop emergence under field conditions in two growing seasons. In cv Spunta, significant foliage protection
was observed up to 35 days after field emergence whereas in seed tubers of cv Kennebec planted in sandy soils, significant
foliage protection persisted longer. Additional evidence for acropetal translocation of Acrobat MZ in field crops was also
found. With this strategy, there is no need to apply contact or systemic fungicides early in the season, and spraying costs
and environmental risks are also reduced. |
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Keywords: | Acrobat MZ Foliage protection Late blight Seed tubers Solanum tuberosum L Systemic fungicide |
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