Tomato production is faced with many fungal diseases including alternariosis and anthracnose caused by Alternaria solani and Colletotrichum sp. respectively, which cause major losses in production. Identify effective biofungicidal formulations based on extracts of Eucalyptus camaldulensis Dehnh. and Cymbopogon citratus (DC.) Stapf on the radial growth of Alternaria solani and Colletotrichum sp. The efficacy of aqueous or ethanolic extracts of Eucalyptus camaldulensis or Cymbopogon citratus as well as combinations of aqueous extracts (4/1; 3/1 and 2/1) on the radial growth and sporulation of Alternaria solani and Colletotrichum sp. was studied in vitro. Then incubated at 25°C under an alternating 12/12 cycle of near ultra-violet light and darkness. The inhibition rate was measured on days 2, 4 and 7 after incubation (DAI) and for sporulation on day 14. All the extracts of the two plants, aqueous or ethanolic, showed the maximum inhibition rate (100%) on the radial growth of Alternaria solani and Colletotrichum sp. at concentrations of 20% and 30%. On the other hand, the combination of aqueous extracts was only effective at the 30% dose with inhibition rates of 49% on Alternaria solani and 21% on Colletotrichum sp. At doses of 20% and 30%, aqueous or ethanolic extracts of Eucalyptus camaldulensis or Cymbopogon citratus completely inhibit the mycelial growth of Alternaria solani and Colletotrichum sp.

Alternaria solani, Biofungicides, Colletotrichum sp, Plant extracts, Tomato