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. 2014 Apr 3;9(4):e91878. doi: 10.1371/journal.pone.0091878

Figure 1. In vitro effect of boric acid on the germination and colonization of Saprolegnia spores.

Figure 1

Effect of boric acid on the germination and colonization of Saprolegnia spores following 48 hours incubation. (a1 and a2) Grade 3: Profuse Saprolegnia hyphal growth on sesame seeds in the non- treated control group (water). (b1 and b2) Grade 3: germinating spores with mycelial growth on the sesame seeds (boric acid <0.2 g/L). (c1 and c2) Grade 2: reduced germination rate and minimal mycelial growth on the sesame seeds (boric acid 0.2–0.4 g/L). (d1 and d2) Grade 1: germinating spores without growing mycelia on the sesame seeds (boric acid 0.5–0.7 g/L). (e1 and e2) Grade 0: no germinating spores, no growing mycelia on the sesame seeds (boric acid ≥0.8 g/L). (f1 and f2) Grade 0: positive control group (bronopol), no spore germination with absence of the growing mycelia on sesame seeds.