This research

aimed to determine the relationship between the color of the

pigment produced by isolates of F. verticilliodes and virulence

in maize seedlings. Symptomatic and asymptomatic corn cobs

were collected in Veracruz State, Mexico during the springsummer

cycle of 2008. The experiment was analyzed using an

experimental design in split plots with a double division, under

greenhouse conditions during two crop cycles, fall-winter of

2008 and spring-summer of 2009, in the Postgraduate College

Campus Montecillo, Mexico State. The pigmentation of the

isolates obtained from symptomatic seeds with mycelium was

more intense with a purple color, and the white mycelium

isolates showed a more homogeneous color. Isolates from

asymptomatic seeds had a tenuous violet coloration, and from

white to cream coloration of mycelium. It was observed that

isolates from symptomatic and asymptomatic seeds were

pathogenic; the purple isolations from symptomatic seeds

were more virulent than the white isolate, opposite to what

happened with the isolation from asymptomatic seeds, in

which the white mycelium was more virulent.

Keywords: Fungi, purple-mycelium, white-mycelium, symptomatic and asymptomatic seed.