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Alternatives for the gray mold (Botrytis cinerea) control in cape gooseberry (Physalis peruviana) crop
By Yimmy Alexander Zapata Narváez*, Andrés Díaz Garcia, Camilo Rubén Beltrán Acosta
* Corresponding Author. Email: - / Institution: Corporación Colombiana de Investigación Agropecuaria - Agrosavia
Accepted: 10/July/2023 – Published: 31/July/2023 – DOI: https://doi.org/10.18781/R.MEX.FIT.2302-5
Abstract The effect of the field applications of three bioproducts (based on Trichoderma koningiopsis, Rhodotorula mucilaginosa, and Bacillus amyloliquefaciens), the alternation of the biostimulant Kendal® and the Swinglea glutinosa extract and the rotations of two fungicides (based on Azoxystrobin-Difenoconazole and Thiram- Pyrimethanol), on the incidence of gray mold in cape gooseberry postharvest was evaluated. For this purpose, the fruit was harvested weekly in the field, arranged in wet chambers with fruits with and without calyx, and incubated for seven days at 20 °C in laboratory conditions to promote the development of B. cinerea and determine the efficacy in its control. In addition, the populations of the microbial antagonists were monitored between applications by collecting the leaflets and washing them in 0.1% Tween 80 and sowing aliquots in specific culture media. In fruits with calyx, the lowest incidence of the gray mold, with averages of 48 and 51%, occurred with the applications of the bioproducts based on T. koningiopsis and R. mucilaginosa, respectively. In contrast, the incidence did not exceed 1.4% in fruits without calyx in all treatments. Furthermore, the population of microbial antagonists in the phyllosphere remained constant between applications, with counts of 1x103 CFU g-1 for T. koningiopsis and 1x105 CFU g-1 for R. mucilaginosa and B. amyloliquefaciens.
Keywords: Calyx, quiescent infections, incidence, efficacy
