Efeito do tratamento químico em sementes e parte aérea no controle de doenças e na qualidade de sementes de soja

Abstract

The aim of this study was to investigate the effect of the interaction in the chemical treatment of seeds and aerial parts fungicides in dealing with anthracnose, leaf spots and rust spots and the sanitarian and physiological qualities of these seeds. Monsoy 9056 RR soybean seeds treated with carbendazim + thiram, fludioxonil + metalaxyl- m, carbendazim + thiram + fluquinconazole, pyraclostrobin + thiophanate methyl + fipronil, thiophanate methyl + fluazinam, penflufen + carbendazim + thiram and pyraclostrobin + fluquinconazole were used, as well as untreated seeds. In the experiment realized in Campo Verde - MT, epoxiconazole + pyraclostrobin, azoxystrobin + cyproconazole and prothioconazole+ trifloxystrobin witness treatments were used on the aerial parts. The outline was made in blocks with portions subdivided randomly, being eight seed treatments and four aerial parts treatments in three repetitions, totaling 24 portions for seed treatment and 96 subportions with the aerial parts fungicides. The seed treatments provide greater residual effect at initial inoculum anthracnose and leaf spot reducing in Monsoy 9056 soybean.The aerial treatments provide the best rust control. The application of fungicides in the aerial parts provides seeds with higher stamina, viability and health levels, higher productivity and a thousand seeds mass, as well as lower area under the disease progress curve and defoliation.