Articles
Decline of charcoal rot in strawberry by anaerobic soil disinfestation: reduction of propagules and/or induction of soil suppressiveness
Article number
1410_16
Pages
109 – 114
Language
English
Abstract
In previous work, anaerobic soil disinfestation using agro-industrial residues, such as rice bran and residual strawberry extrudate, was able to reduce the charcoal rot disease in strawberry plants growing in soil previously infected with Macrophomina phaseolina. The objective of this work was to elucidate if the disease severity decline was due to a reduction of propagules of M. phaseolina and/or to a possible induction of soil suppressiveness.
Four trials were conducted in a growth chamber with a totally randomized experimental design with three repetitions per treatment.
Three different amendments were used: rice bran, residual strawberry extrudate, and fish meal.
A control soil exposed to anaerobiosis but without organic amendment and an untreated control soil were added.
The redox potential was measured as an indicator that anaerobiosis was occurring.
After the treatments, strawberry plants were grown on these soils and inoculated with M. phaseolina propagules by pouring into the soil.
Measurements of disease severity were made from symptom onset until the mortality reached 100% in a treatment.
Although anaerobiosis was well developed, no effect of treatment on disease severity was observed.
The results seem to indicate that anaerobic soil disinfestation owes its efficacy against charcoal rot disease of strawberry to the reduction of fungal propagules and not to the induction of soil suppressiveness.
Four trials were conducted in a growth chamber with a totally randomized experimental design with three repetitions per treatment.
Three different amendments were used: rice bran, residual strawberry extrudate, and fish meal.
A control soil exposed to anaerobiosis but without organic amendment and an untreated control soil were added.
The redox potential was measured as an indicator that anaerobiosis was occurring.
After the treatments, strawberry plants were grown on these soils and inoculated with M. phaseolina propagules by pouring into the soil.
Measurements of disease severity were made from symptom onset until the mortality reached 100% in a treatment.
Although anaerobiosis was well developed, no effect of treatment on disease severity was observed.
The results seem to indicate that anaerobic soil disinfestation owes its efficacy against charcoal rot disease of strawberry to the reduction of fungal propagules and not to the induction of soil suppressiveness.
Authors
A.M. Márquez-Caro, A.M. Pastrana, C. Borrero, M. Avilés
Keywords
Macrophomina phaseolina, qPCR, soil inoculum
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