Abstract

VALVERDE-RODRIGUEZ, Agustina; CORNEJO Y MALDONADO, Antonio; MIGUEL VILLANUEVA, Nalda  and  CAMPOS ALBORNOZ, Miltao Edelio. Entomopathogenic bacteria and fungi in the management of Brevicoryne brassicae (Homoptera: Aphididae) in cabbage crops. Siembra [online]. 2024, vol.11, n.1, e4994. ISSN 2477-8850.  https://doi.org/10.29166/siembra.v11i1.4994.

The use of fungi and bacteria with pathogenic capacity towards insects is considered a sustainable agroecological alternative for efficient pest control, as they are microorganisms of easy production in industrial scale, formulation and use. Therefore, the objective was to evaluate four entomopathogenic formulations in the control of Brevicoryne brassicae L., a key pest of cabbage (Brassica oleracea L.), in a randomized complete block design with 4 treatments, plus an absolute control and 4 replicates. The variables evaluated were the number of dead and live aphids per plant and the number of infested plants. The commercial formulations Biosafe, BesT-K, Metarrizo and Yurak containing strains of Bacillus subtilis, Bacillus thuringiensis var kurstaki (Btk), Metarhizium anisopliae and Bauveria bassiana respectively, are the ones that were used by spray application to the crop in two seasons: planting, season August-December 2019 and August-December 2021. Among the results, M. anisopliae was recorded with up to 91.11 % efficiency, followed by B. bassiana with 89.50 % and Bs with 79.38 % in the reduction of populations under field conditions. In the laboratory, Btk and M. anisopliae reached 100 % mortality in a period of seven days, so it is concluded that in the medium term, entomopathogenic fungi in the field are more efficient in aphid control; however, in controlled conditions Btk is also efficient.

Keywords : entomopathogens; efficacy; mortality; aphids; biopesticides.

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