Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 110.
  1. Library Resource
    Articles et Livres
    décembre, 1995
    Colombie, Amérique du Sud

    The cultivation of calopo, Calopogonium mucunoides, as a promising forage legume for the lowland tropics, was hindered by its susceptibility to a severe yellow mosaic disease observed in the Eastern Plains of Colombia. An isometric virus ca. 28 nm in diameter was observed by electron microscopy in leaf extracts and purified preparations, and in phloem cells of systemically infected calopo plants. The virus was transmitted by mechanical means and by the chrysomelid beetle Diabrotica balteata. The host range of the virus was restricted to the legumes Phaseolus vulgaris, Vigna unguiculala, V.

  2. Library Resource
    Articles et Livres
    décembre, 1995

    Claims of sustainability are virtually impossible to prove but enough is known about tropical forest ecology and silviculture to protect ecosystem functions and maintain biodiversity while still deriving financial profits from logging. Rapid improvements in long-term forest production will derive from better planning of harvesting operations and stand improvement treatments. Lack of good management plans generally results in logging practices that destroy natural regeneration and increase forest susceptibility to soil loss, wildfires, and weed infestations.

  3. Library Resource
    Articles et Livres
    décembre, 1995
    Fidji, Bangladesh, États-Unis d'Amérique, Chine, Sri Lanka, Indonésie, Australie, Guinée, Pakistan, Thaïlande, Népal, Laos, Philippines, Îles Salomon, Viet Nam, Myanmar, Brunéi Darussalam, Cambodge, Inde, Bhoutan, Malaisie, Papouasie-Nouvelle-Guinée

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