Reuters say : Prolonged humidity in the wake of deadly tropical storm Agatha, which dumped more than one metre of rain in mountainous western Guatemala, is fertile ground for the Ojo de Gallo fungus, or Mycena citricolor. The Ojo de Gallo pest grows on coffee tree leaves and causes them to fall, exposing the cherries to wind and rain and can make them rot. The pest hurt Costa Rica's coffee crop in the 2006/07 season, slightly reducing the harvest. The local office of Guatemala’s National Coffee Association (Anacafe) in the western San Marcos region said more heavy rain could also cause berries to fall, but that the impact on the 2010/11 crop is unknown. Farmers in El Salvador are also worried that high and sustained humidity could bring on the coffee borer beetle, an extremely harmful pest that eats the coffee berries. Blocked roads have made it impossible to reach many farms in the western part of the country.