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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Use of phosphonate to manage foliar potato late blight in developing countries
Plant Disease, Volume 96, No. 7, Year 2012
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Description
Twenty phosphonate products found in the agrochemical market in Ecuador and Peru were evaluated in bioassays for the control of foliar potato late blight, caused by Phytophthora infestans. Eight phosphonate products were evaluated in 16 field experiments done in Peru, Ecuador, Kenya, and Nepal. A meta-analysis across locations involving 71 combinations of potato genotype by site and year demonstrated a significant relationship between phosphonate application rate and efficacy for controlling late blight on potato foliage. The meta-analysis revealed that phosphonate rates of approximately 2.5 g a.i./liter provided efficacy similar to that of the conventional contact fungicides mancozeb and chlorothalonil used at similar rates. At rates higher than 2.5 g a.i./liter, the efficacy of phosphonate was superior to the contact fungicides. Overall, late blight control by phosphonate appeared relatively stable in field experiments across locations. An analysis of field experiments and 64 combinations of potato genotype by site and year showed no correlation between the susceptibility level of potato genotypes and efficacy of phosphonates. The cost of both phosphonate compounds and contact fungicides varied greatly among the countries of the field study; however, in Kenya, control with phosphonate was clearly less expensive than with mancozeb. © 2012 The American Phytopathological Society.
Authors & Co-Authors
Kromann, Peter
Ecuador, Quito
International Potato Centre Quito
Pérez, Willmer G.
Peru, Lima
Centro Internacional de la Papa, Peru
Taipe, Arturo
Ecuador, Quito
International Potato Centre Quito
Schulte-Geldermann, Elmar
Kenya, Nairobi
International Potato Center Nairobi
Sharma, Buddhi Prakash
Nepal, Council
National Potato Research Programme
Andrade-Piedra, Jorge L.
Ecuador, Quito
International Potato Centre Quito
Forbes, Gregory Allan
China, Beijing
Cip China
Statistics
Citations: 37
Authors: 7
Affiliations: 5
Identifiers
Doi:
10.1094/PDIS-12-11-1029-RE
ISSN:
01912917
Research Areas
Genetics And Genomics
Study Approach
Systematic review
Study Locations
Kenya