Abstract
We examined the incidence of fusariosis in Montes Claros–MG and determined the effect of temperature and photoperiod on the development of Fusarium guttiforme. Four family production units were investigated, from which four isolates of F. guttiforme were isolated. For each isolate, two experiments were set up to assess mycelial growth for 144 h in environments with different temperatures and either a 12 h photoperiod or continuous darkness. To evaluate the development of isolates of F. guttiforme, we used a portion sub-divided randomized block design. The number of conidia produced by each isolate was counted according to the above-mentioned conditions. All production units had occurrence rates ranging from 12.2 to 64.4%. The fungal isolates showed a higher mycelial growth rate when incubated at 25°C under a 12 h photoperiod. However, the production of conidia varied depending on the temperature and on the isolate. With these overall results better understand how the spread of this fungus occurred so quickly. We may use this information to suggest management practices that reduce the incidence of pineapple fusariosis. Key words: Light, mycelial growth rate, Fusarium guttiforme, temperature.
Highlights
Brazil has an average pineapple productivity of 40 t ha-1, below the average of 50 t ha-1 achieved by other producer countries
We examined the incidence of fusariosis in four family production units in the municipality of Montes Claros–Minas Gerais and determined the influence of temperature and photoperiod on the development of F
Some of the factors that may have contributed to the high number of diseased plants in the units were the relative humidity, which remained above 60% during the evaluation period; the average temperature, which ranged from 20 to 30°C; and the phenological stage of the crop
Summary
Brazil has an average pineapple productivity of 40 t ha-1, below the average of 50 t ha-1 achieved by other producer countries. To determine the mycelial growth rate and conidial production of the four isolates, two treatments were conducted, in which each isolate was subjected to either a photoperiod of 12 h or continuous darkness. Some of the factors that may have contributed to the high number of diseased plants in the units were the relative humidity, which remained above 60% during the evaluation period; the average temperature, which ranged from 20 to 30°C; and the phenological stage of the crop (breeding/propagation).
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