Screening of cassava varieties for resistance to brown leaf spot [study 6, Philippines]. Terminal report

The study was conducted at the Visayas State College of Agriculture [Baybay, Leyte, Philippines] to screen cassava varieties/cultivars which are resistant to brown leaf spot caused by Cercospora henningsii. Cassava plants inoculated 8 weeks after planting significantly manifested the earliest sympto...

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Bibliographic Details
Main Author Palomar M.K
Format Publication
LanguageEnglish
Published 1980
Subjects
cercospora
disease resistance
filipinas
manchas
manihot esculenta
philippines
resistance aux maladies
resistencia a la enfermedad
seleccion
selection
spots
tache
variedades
variete
varieties
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Summary:The study was conducted at the Visayas State College of Agriculture [Baybay, Leyte, Philippines] to screen cassava varieties/cultivars which are resistant to brown leaf spot caused by Cercospora henningsii. Cassava plants inoculated 8 weeks after planting significantly manifested the earliest symptom and defoliation. This indicates that this is the most susceptible stage of growth to C. henningsii. Initial symptoms of the disease were light green, round lesions about 3-5 mm in diameter which later turned greenish brown. These lesions later on coalesced and resulted in blighting and subsequent defoliation. A total of 112 cassava accessions were studied for their susceptibility to brown leaf spot disease in the field. Based on the rating scale, 29 accessions were ranked resistant with 0-5 total area of lesion (cm2) range.
Bibliography:F30
PARRS Project-343
F