Organizing Committee


Poster Presentations


Poster Presentations


Management of Asian soybean rust—ASR with emphasis in the timing and number of spraying seeking the grains quality

Presenter: Wilson Store Venancio(1)

Other authors and affiliations: Eduardo Lima Leduc(2), Mauricio C. Mayer(3), Edson Begliomini(2). (1)Ponta Grossa State University, Phytosanitary Department, Ponta Grossa, Parana 84035-130, Brazil; (2)BASF-SA, Divisão Agro, São Paulo 04538-132, Brazil; (3)EMBRAPA - CNPsoja, Campo experimental de Balsas, Balsas, Maranhão 65800-000, Brazil

The ASR, caused by Phakopsora pachyrhizi (Sydow) is the main soy fungus disease in Brazil. The objective of these experiments was to quantify the effect of fungicide application, timing, and rates in ASR control; the experiment design was a RCB with four reps in Ponta Grossa-PR, in the growing season of 2006/2007, variety CODETEC-205. Treatments were 1. untreated; 2. (BAS500F + TZ1); TZ1; (BAS500F + TZ1) (500; 600 and 500 ml/ha); 3. (BAS500F + TZ1); TZ1; TZ1 (500; 600 and 600 ml/ha); 4. (BAS500F + TZ1); (BAS500F + TZ1); TZ1 (500; 500 and 600 ml/ha); 5. (BAS500F + TZ1); TZ1; (BAS500F + TZ1); TZ1 (500; 600; 500 and 600 g/ha); 6. (ST + TZ2); TZ2; (ST + TZ2) (300; 300 and 300 ml/ha); 7. (MT + TZ3); TZ3; (MT + TZ3) (600; 500 and 600 ml/ha); 8. (MT + TZ3); TZ3; TZ3 (600; 500 and 500 ml/ha); 9. (MT + TZ3); (MT + TZ3); TZ3 (600; 600 and 500 ml/ha); and 10. (MT + TZ3); TZ3; (MT + TZ3); TZ3 (600; 500; 600 and 500 g/ha). Results indicated that the premixed fungicide product, containing ST+TZ alternated with isolate TZ was effective to control ASR and severity was lower and yields were higher when three applications of fungicide were used. The results indicate damages caused by the ASR in the grains quality: originating grains not well formed and inappropriate for the industry in the untreated control. In high-pressure ASR and with the first spraying begun with the premixed fungicide product at R1 reproductive phenologic stage, three sprayings were necessary, was not significantly different from possible alternations among products in the other spraying, so much in the disease management as in the effects on yield factors.

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