Farmer-managed trials in south-east Nigeria to evaluate the rice variety Cisadane and estimate yield losses caused by the African rice gall midge, Orseolia oryzivora Harris & Gagne

Farmer-managed trials of the rice variety Cisadane were undertaken at 47 rainfed lowland sites around Abakaliki, south-east Nigeria, a major outbreak area of the African rice gall midge (ARGM). At each site a plot of Cisadane was grown alongside a control plot of the participating farmer's usua...

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Bibliographic Details
Published in:	International journal of pest management Vol. 45; no. 2; pp. 117 - 124
Main Authors:	Williams, C.T, Ukwungwu, M.N, Singh, B.N, Okhidievbie, O, Nnabo, J
Format:	Journal Article
Language:	English
Published:	London Taylor & Francis Group 01-01-1999 Washington, DC Taylor & Francis
Subjects:	Agronomy. Soil science and plant productions Biological and medical sciences Cecidomyiidae crop yield cultivars Fundamental and applied biological sciences. Psychology Genetics and breeding of economic plants Nigeria Orseolia Oryzivora Oryza Sativa Pest animals Pest resistance Varietal Resistance Varietal selection. Specialized plant breeding, plant breeding aims variety trials yield forecasting Yield Loss yield losses Nigeria West Africa Africa Cecidomyiidae Monocotyledones Evaluation scale Insecta Tropical zone Rainfed agriculture Variety trial Cropping system Cereal crop Oryza sativa Pest Gramineae Arthropoda Insect resistance Genetic improvement Angiospermae Spermatophyta Yield Invertebrata Farmer Damage Infestation Diptera
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Summary:	Farmer-managed trials of the rice variety Cisadane were undertaken at 47 rainfed lowland sites around Abakaliki, south-east Nigeria, a major outbreak area of the African rice gall midge (ARGM). At each site a plot of Cisadane was grown alongside a control plot of the participating farmer's usual variety. On average the Cisadane yielded 26% higher than the controls but ARGM infestation levels on it were only slightly lower, suggesting thatithad greater tolerance to the pest butlittle antixenotic or antibiotic resistance. For all of 14 evaluation criteria, most participating farmers rated Cisadane as better than their control varieties. It appears to be a useful component for an ARGM management strategy. Regression analyses of yield on alternative variables for ARGM infestation derived from data recorded at 3, 7 or 11 w.a.t. (weeks after transplanting) showed that the log-transformed percent tiller infestation at 7 w.a.t. was the best predictor of yield. Variables for site topography, water level, fertilizer use in the nursery, and plant spacing also had significant partial regression coefficients. Excluding plots with tiller infestation levels above 30%, the relationship between yield and infestation was approximately linear and suggested a yield loss of 2.9% per 1% increase in infestation.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0967-0874 1366-5863
DOI:	10.1080/096708799227905