Qualidade sanitária e fisiológica de sementes de soja submetidas a tratamento com bioprotetor e fungicida

Abstract

O objetivo do trabalho foi avaliar o efeito do bioprotetor Agrotrich® e do fungicida Vitavax-Thiram®, isoladamente ou combinados, sobre a qualidade sanitária e fisiológica de sementes de soja, pelas avaliações de sanidade, germinação, avaliação de plântulas, emergência em casa de vegetação e no campo. O experimento foi realizado no Laboratório de Fitopatologia e na área experimental do Departamento de Defesa Fitossanitária da Universidade Federal de Santa Maria, no período de junho a novembro de 2007. Na avaliação de sanidade, os tratamentos com fungicida químico, isolado ou em combinação, apresentaram os menores valores de incidência de fungos. Para germinação e primeira contagem, o tratamento com metade da dosagem dos produtos apresentou o melhor resultado. Na avaliação de plântulas em casa de vegetação, os tratamentos não diferiram entre si, em nenhuma das variáveis, assim como na emergência, índice de velocidade de emergência, primeiro, segundo e terceiro trifólio, no campo. Na análise de correlação entre os fungos e as variáveis da qualidade fisiológica, predominou o efeito negativo sobre estas. A combinação dos produtos com metade da dose proporciona efeito positivo sobre o potencial fisiológico das sementes de soja.

Seed treatment and pre-inoculation of soybean: effect of storage period and agrochemicals on the physiological quality of seed and yield

“…+ fipronil + tiophanate-methyl + praclostrobin, and fipronil + tiophanate-methyl + pyraclostrobin (Table 4). It was already reported in a previous study that seed treatment with fungicide (carboxin + thiram) increased the percentage of germinated seeds compared to the nontreated control (Brand et al, 2009). These results are contrary to what was observed by Ferreira et al (2016) who reported that fipronil + tiophanate-methyl + pyraclostrobin had negative effect on physiological quality of seed by reducing germination whereas it increased the percentage of abnormal seedlings.…”

“…These results are contrary to what was observed by Ferreira et al (2016) who reported that fipronil + tiophanate-methyl + pyraclostrobin had negative effect on physiological quality of seed by reducing germination whereas it increased the percentage of abnormal seedlings. It is not very clear how a fungicide could improve the physiological quality of seed, but one hypothesis is that the fungicide can provided a better control of fungi that infected seeds and this could reflect in the physiological quality during the storage period (Brand et al, 2009). After 51 days of storage, pre-inoculation with HiCoat ® and application of carbendazim + thiram + fipronil presented higher seed germination (Table 4) and lower percentage of abnormal seedlings (Table 5) than the nontreated and non-inoculated control.…”

Pathogens incidence and quality of extracted crude oil from soybean seeds stored under different conditions

“…The health of seeds is extremely important because approximately 90% of crops used for food, both human and animal, are propagated by seeds (Henning, 2005) and their inoculum that are present may result in increased disease in field and its introduction in pathogen free areas (Brand et al, 2009).…”

Germination, vigor and pathogen incidence in broccoli seed treated with Carboxin + Thiran

“…Working with wheat crop, Marini et al (2011) reported a reduction in germination and vigor of seeds treated with Carboxin+Thiram. Faria et al (2003) observed that although there was an increase in germination and emergence of cotton seeds treated with Carboxin + Thiram, the seedlings were smaller and with less dry matter. Morales et al (2012) observed higher vigor of rice seeds treated with this fungicide after seed storage for 60 and 90 days, compared to control.…”

“…There are studies assessing the effects of this fungicide on seed physiological quality of cotton (Faria et al, 2003), castor plant (Tropaldi et al, 2010;Santos et al, 2012), peanuts (Bittencourt et al, 2007), rice (Schuch et al, 2006;Lobo, 2008;Morales et al, 2012), maize (Fessel et al, 2003), safflower , and wheat (Marini et al, 2011), among other species. However, no research on vegetables was found that studied the fungicide effect on seed quality.…”