Relating Water Management Regimes and Rice Genotypes with Occurrence of Insect Pests and Diseases of Rice in Uganda
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Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Global Agriculture and Ecology
Abstract
The research was conducted to assess the effect of water management regimes and/or rice genotypes on
occurrence of insect pests and diseases of rice in Uganda. The study was conducted in phased field trials under
natural conditions during the second rainy season of 2012 and the first rainy season of 2013. The trials were laid
out in a Randomised Complete Block Design arranged as a split plot with three replications. Water management
regimes (alternate wetting and drying-AWD, continuous flooding-CF and continuous drying-CD) constituted
the main-plots and rice genotypes the sub-plots. Results indicated that the stalked-eyed fly (Diopsis spp) and
African rice gall midge (Orseolia oryzivora) were the most encountered insect pests and both pests occurred
highest in CF fields. Rice blast, brown spot, grain rot, rice yellow mottle virus (RYMV) and sheath rot were the
diseases recorded in rice during the study. Rice blast and brown spot were the most prevalent diseases (>10%
incidence), and brown spot was most prevalent under the AWD regime whereas RYMV was most prevalent in
the CF regime. The level of occurrence of rice blast and RYMV recorded in the different water management
regimes was dependent on the rice genotype. Generally, different genotypes had different insect pest/diseases
occurrence profiles. The implication of these findings therefore is that for effective integrated pest management,
knowledge of the most limiting pest/disease is important in deciding the appropriate water management regime.
However, further experimental trials need to be conducted in different agro-ecological zones to verify these
findings.
Description
Keywords
Alternate wetting and drying, Rice genotypes, Disease incidence and severity
Citation
Awio, T. H. O. M. A. S., Karungi, J. E. N. I. N. A. H., Bua, B. O. S. C. O., & Lamo, J. I. M. M. Y. (2016). Relating water management regimes and rice genotypes with occurrence of insect pests and diseases of rice in Uganda. Journal of Global Agriculture and Ecology, 4(1), 12-20.