Activity of selected Bacillus strains on Trichoderma Aggressivum and Trichoderma Harzianum

Cocultures are the simultaneous cultivation of two or more microorganisms on the same medium, making it possible to learn about the relationships that ascend between them.

Organisms that are part of cocultures can cooperate with each other or put up with each other's actions by producing metabolites that are unfavorable for the other microorganism.

A study conducted in 2024 by Biosphertia aimed to assess the impact of specific strains of Bacillus on two fungi, Trichoderma aggressivum and Trichoderma harzianum.

Trichoderma species are rhizosphere-inhabiting fungi that attack and parasitize other fungal species contributing to reduced crop efficiency. Trichoderma aggressivum is responsible for the formation of green mold in compost.

The study showed the highest consortium activity from a minimum of 2 Bacillus strains, recommended are BSS 00500, and BSS 06936 on Trichoderma aggressive and consortium from minimum 2 strains or 3-4 strains which effective are: BSS 89692, BSS 88692, BSS 86077, BSS 68993, BSS 00500 on Trichoderma harzianum.

The interaction of certain Bacillus strains reduces the occurrence of fungi of the genus Trichoderma, making them a good, easy-to-use repressor of the negative effects of T. aggressivum and T. herzianum.