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The antimicrobial activity of 12 plant extracts was tested against the phytopathogens  Alternaria alternata  and  Fusarium solani . In addition, the compatibility of the extracts toward  Bacillus liqueniformis , a biofertilizer and a non-target microorganism, was assessed. Plants tested belong to the Euphorbiaceae, Asteraceae, Crassulaceae, Rubiaceae, Convolvulaceae, Verbenaceae, Orchidaceae, Nyctaginaceae, Boraginaceae, and Tiliaceae families and were collected in the State of Oaxaca. The antifungal activity of the plant extracts (50–100 mg/mL) against  A. alternata  and  F. solani , was determined by measuring the mycelium radial growth and obtaining the minimum inhibitory concentration (MIC) of fungal growth. In addition, with the aim of finding plant extracts which are compatible with a  B. licheniformis  biofertilizer strain and to test the non-toxic nature of the treatments, the toxicity of the extracts toward this strain was evaluated using the agar diffusion method. Azoxystrobin (12 μg) and chloramphenicol (30 μg) were used as positive controls for the pathogens and for the non-target bacteria, respectively. Plant extracts inhibited fungal growth in the ranges of 0.76–56.17% against  F. solani  and 2.02–69.07% against  A. alternata . The extracts of  Acalypha subviscida ,  Ipomoea murucoides ,  Tournefortia densiflora  and  Lantana achyranthifolia  showed MIC values between 5.77–12.5 mg/mL for at least one of the fungal species. The best treatment,  Adenophyllum aurantium , exhibited a maximum inhibition for both  F. solani  (56.17%, MIC = 7.78 mg/mL) and  A. alternata  (68.64% MIC = 7.78 mg/mL), and resulted innocuous toward  B. licheniformis . Therefore, this plant has an outstanding potential for the agroecological control of fungal phytopathogens in industrial crops.

Effect of crude plant extracts from some Oaxacan flora on two deleterious fungal phytopathogens and extract compatibility with a biofertilizer strain