The South American forage legume Arachis pintoi was found to be affected by foliar ring spot symptoms in surveys of various localities in the Cauca Valley of Colombia. A filamentous virus (approximately 750 nm) isolated from symptomatic A. pintoi plants induced the characteristic ring spot sympto...
Morales, Francisco José
,
Castaño, M.
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Velasco, Ana Cecilia
,
Arroyave, José A.
,
[Natural infection of tropical forage legume species of Arachis and Stylosanthes by potyviruses related to peanut mottle virus]
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Natural infection of tropical forage legume species of Arachis and Stylosanthes by potyviruses related to peanut mottle virus
Global interest on plant-microbe-insect interactions is rapidly growing, revealing the multiple ways in which microorganisms mediate plant-herbivore interactions. Phytopathogens regularly alter whole repertoires of plant phenotypic traits, and bring about shifts in key chemical or morphological c...
Lenne, J.M.
,
Sonoda, R.M.
,
[Effect of anthracnose on yield of the tropical forage legume Stylosanthes hamata]
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Effect of anthracnose on yield of the tropical forage legume Stylosanthes hamata
Variation for nine virulence and four electrophoretic characters was determined for 69 samples of Colletotrichum gloeosporioides collected in five natural stands of its host, Stylosanthes guianensis, in South America. Virulence phenotypes varied from four in the Quilichao population to 22 in the ...
Lenne, J.M.
,
Burdon, J.J.
,
[Preliminary study of virulence and isozymic variation in natural populations of Colletotrichum gloeosporioides from Stylosanthes guianensis]
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Preliminary study of virulence and isozymic variation in natural populations of Colletotrichum gloeosporioides from Stylosanthes guianensis
Agronomic assessment of 76 accessions of tropical fine stem stylo or "tardio" (Stylosanthes guianensis Sw. var. guianensis) was carried out at the Carimagua Research Station in the eastern plains region of Colombia. Of 27 accessions tested for dry matter yield, CIAT 10136 was the highest yielder ...
Grof, B
,
[Preliminary studies on the performance of accessions of tropical fine stem stylo (Stylosanthes guianensis sw. var. guianensis) in the eastern plains of Colombia]
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Preliminary studies on the performance of accessions of tropical fine stem stylo (Stylosanthes guianensis sw. var. guianensis) in the eastern plains of Colombia
In recent years, increasing numbers of pathogens and pests have been reported from major centres of tropical pasture research. Damage is often severe and controls are needed. Diseases and pests may be controlled chemically, biologically, culturally and genetically. In pasture plants genetical res...
Lenne, J.M.
,
Turner, J.W.
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Cameron, DF
,
[Resistance to diseases and pests of tropical pasture plants]
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Resistance to diseases and pests of tropical pasture plants
The seed yields and limitations to yield for nine pasture legumes in a tropical savanna region were defined in a 3-year field experiment at the Cerrodos Agricultural Research Centre near Brasilia (15°36' S, 47° 42' W). Assessment was based on flowering times, incidence of diseases and pests, yiel...
Andrade, Ronaldo P. de
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Thomas, D.
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Ferguson, John E.
,
[Seed production of pasture species in a tropical savanna region of Brazil. 1. Legumes]
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Seed production of pasture species in a tropical savanna region of Brazil. 1. Legumes
A wide range of fungi, two bacteria and several viruses and nematodes have been recorded throughout the tropics on a group of Cassia species defined as taxonomically and geographically related to Cassia rotundifolia. Although limited information was found on the relative importance of these patho...
Fungal pathogens representing 36 genera and over 70 species, one bacterium, mycoplasma-like-organisms, at least six viruses, five races of root-knot nematodes and six other nematodes have been recorded on 18 Desmodium species of agronomic interest throughout tropical regions. Although limited inf...
Diseases of Aeschynomene spp. observed in forage evaluation trials in South America and Florida, U.S.A. are described and discussed. Newly discovered diseases include Polythrincium sp. leaf blotch, Calonectria sp. dieback, and Rhizoctonia solani Kuhn foliar blight. Diseases previously reported fr...