14 research outputs found
Ação do acibenzolar-S-metil aplicado em tubérculos e plantas de batata contra canela preta, incitada por Pectobacterium carotovorum subsp. atrosepticum atípica
Aplicação curativa de fungicidas e seu efeito sobre a expansão de lesão da mancha-amarela do trigo
Efeito do substrato na morfologia de conídios de Bipolaris sorokiniana e da densidade de inóculo na intensidade da mancha marrom em cevada
Expansão de lesão da mancha-reticular da cevada e sua interação com o tratamento de sementes
Expansão de lesão por manchas foliares em cevada e sua interação com a aplicação foliar de fungicidas
Meta-analytic modeling of the decline in performance of fungicides for managing soybean rust after a decade of use in Brazil
An apparent decline of fungicide performance for the control of soybean rust in Brazil has been reported but the rate at which it has occurred has not been formally quantified. Control efficacy and yield response to three fungicides applied as single active ingredients (a.i.)—azoxystrobin (AZOX), cyproconazole (CYPR), and tebuconazole (TEBU)—and four applied as mixtures—AZOX+CYPR, picoxystrobin + CYPR, pyraclostrobin + epoxiconazole, and trifloxystrobin + prothioconazole (TRIF+PROT)—were summarized using network meta-analytic models fitted to mean severity and yield data from 250 trials (10-year period). The effect of year was tested on both variables in a meta-regression model. Overall control efficacy ranged from 56 to 84%; the three single-a.i. fungicides performed the poorest (56 to 62%). Yield increase for single-a.i. fungicides was as low as 30% but ranged from 47 to 65% for the premixes. Significant declines in both variables were detected for all fungicides except TRIF+PROT. For TEBU, control efficacy (yield response) declined the most: 78% (18%) to 54% (8%) from 2004–05 to 2013–14. The recent surge of resistant populations of Phakopsora pachyrhizi to both demethylation inhibitor and quinone outside inhibitor fungicides is likely the driving force behind a significant decline after 4 years of fungicide use
Freqüência de Alternaria dauci E Cercospora carotae como agentes da queima das folhas da cenoura em Passo Fundo, RS
Relações entre intensidade da doença, refletância da radiação solar e rendimento de grãos no patossistema ferrugem da folha de trigo Embrapa 16
Dataset: Fungicide efficacy for soybean rust control and yield increase in Brazil: 10-year dataset
Analysis of the performance of fungicides for controlling soybean rust in Brazil over the year