Influencia de vitaminas y aminoácidos en el creci­miento y esporulación de Mycena citricolor, Phoma costarricensis, Cercospora coffeicola y Ceratostomella fimbriata

Abstract

The four most important pathogens of coffee trees in Costa Rica, Mycella citricolor, Phoma costarricensis, Cercospora coffeicola, and Ce­ratostomella fimbriata were grown in liquid cultures and on agar plates to test their responses to eleven different vitamins and to thirteen aminoacids separately and combined, in terms of growth (expressed as oven dry weight and diametral growth on plates) and of spoculation. None of the vitamins used improved growth significantly of Mycella citricolor, Phoma costarricensis or Cercospora coffeicola. Ce­ratostomella fimbriata grew best in thiamine and nucleic acid. Mycella citricolor and Ce­ratostomella fimbriata sporulated in thiamine only. Phoma costarricensis spoculated in five of the eleven vitamins used. The four organisms were favored in their growth by the presence of amino acids. L-tryptophane, L-valine and asparagin were the only amino acids that induced spoculation on the three fungi, Mycella citricolor, Phoma costarricensis and Ce­ratostomella fimbriata. Ce­ratostomella fimbriata did not grow in a mixture of amino acids.