Chitosan and GRAS substances application in the control of Geotrichum candidum isolated from tomato fruits (Lycopersicum esculentum L.) in the state of Nayarit, Mexico: In vitro tests

Geotrichum candidum causal agent of tomato sour rot, has the potential to infect a wide variety fruits and vegetables. In this work, in vitro antifungal activity Chitosan (Chi), Potassium Sorbate (PS), Sodium Bicarbonate (SB), Carbonate (SC) their mixtures were evaluated. The PS SC treatments showed 100% inhibition mycelial growth (MG), germination, sporulation. Regarding SB, 1.5 2.0% concentrations inhibited 87.5 88.5% MG affected germination Chi at 1.0, 1.5, by 63.1, 62.4, 42.1%, respectively, affecting combination chitosan 0.5% + demonstrated 99.3 71.4%, MG, SB 1.5% no effect on 0.5 1.0%, rate mycelium increased, as well sporulation germination. conclusion, salts are an option for use synthetic fungicides control pathogenic fungi postharvest, with low toxicity, friendly environment.