Acremonium obclavatumwas frequently found associated with pustules of the rust fungusPuccinia arachidison groundnut in Madras, India. Inoculation ofA.obclavatumbefore, with, or after inoculation withP.arachidisreduced the number and size of uredosori both on intact and detached leaves of groundnut plants. Treatments withA.obclavatumresulted in reductions in number of pustules and uredospores, delay in maturity and opening of uredosori, and reduced viability of uredospores. The application of culture filtrates ofA.obclavatumalso reduced the number and size of pustules on intact and detached groundnut leaves. The potential use ofA.obclavatumin biological control of groundnut rust is discussed.Key words: groundnut,Arachis hypogaea, groundnut rust,Puccinia arachidis,Acremonium obclavatum, biological control.
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