eprintid: 68
rev_number: 15
eprint_status: archive
userid: 1
dir: disk0/00/00/00/68
datestamp: 2011-06-08 04:55:23
lastmod: 2011-12-07 06:01:06
status_changed: 2011-06-08 04:55:23
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Mugo, S N
creators_name: Mwimali, M
creators_name: Taracha, C O
creators_name: Songa, J M
creators_name: Gichuki, S T
creators_name: Tende, R
creators_name: Karaya, H
creators_name: Pellegrineschi, A
creators_name: Hoisington, D A
icrisatcreators_name: Hoisington, D A
affiliation: CIMMYT(Nairobi)
affiliation: Kenya Agricultural Research Institute(Nairobi)
affiliation: Bill & Melinda Gates Foundation(Washington)
affiliation: Pioneer Hi-Bred International(Johnston)
affiliation: ICRISAT(Patancheru)
country: Kenya
country: USA
country: India
title: Testing public Bt maize events for control of stem
borers in the first confined field trials in Kenya
ispublished: pub
subjects: s2.6
full_text_status: public
agrotags: <b>Agrotags</b>     - maize | pests | farms | planting | transgenics | genes | crops | experimentation | toxins | proteins <br><b>Fishtags</b>    - NOT-AVAILABLE<br><b>Geopoliticaltags</b> - kenya | africa | southern africa | act | chiloe | washington | mexico | new york
note: The financial support of the Syngenta Foundation for
Sustainable Agriculture is gratefully acknowledged. Joel
Mbithi facilitated field management and Andrew Chavangi
assisted with data analysis.
abstract: Transgenic maize (Zea mays L), developed using modified genes from the bacterium Bacillus
thuringiensis (Bt), controls stem borers without observable negative effects to humans, livestock or
the environment, and is now sown on 134 million hectares globally. Bt maize could contribute to
increasing maize production in Kenya. Nine public Bt maize events of cry1Ab and cry1Ba genes were
tested in confined field trials site (CFTs) to assess the control of four major Kenyan stem borer
species. Leaf damage rating, number of exit holes and tunnel length were scored in the field
evaluations. Leaf area consumed and mortality rates among stem borers were scored in the leaf
bioassays in a Biosafety Level II laboratory, located at the Kenya Agricultural Research Institute
(KARI), National Agricultural Research Laboratories (NARL). Field evaluations showed that Bt maize
controlled Chilo partellus with mean damage scores of 1.2 against 2.7 for the non-Bt CML216 control.
Laboratory bioassays showed high control for Eldana saccharina and Sesamia calamistis, with mean
larval mortality of 64 and 92%, respectively. However, substantial control was not observed for
Busseola fusca. These results showed that Bt maize could control three of the four major stem borers
in Kenya with mortality records of 52.7% for B. fusca, 62.3% for E. saccharina and 85.8% for S.
calamistis. Additional Bt genes need to be sought and tested for effective stem borer control in all
maize growing ecologies in Kenya.
date: 2011
date_type: published
publication: African Journal of Biochemistry Research
volume: 10
number: 23
publisher: Academic Publishers
pagerange: 4713-4718
refereed: TRUE
official_url: http://www.academicjournals.org/AJB/PDF/pdf2011/1JunConf/Mugo%20et%20al.pdf
related_url_url: http://scholar.google.co.in/scholar?hl=en&q=allintitle%3A%22Testing+public+Bt+maize+events+for+control+of+stem%22&as_sdt=0%2C5&as_ylo=&as_vis=0
related_url_type: author
citation:   Mugo, S N and Mwimali, M and Taracha, C O and Songa, J M and Gichuki, S T and Tende, R and Karaya, H and Pellegrineschi, A and Hoisington, D A  (2011) Testing public Bt maize events for control of stem borers in the first confined field trials in Kenya.  African Journal of Biochemistry Research, 10 (23).  pp. 4713-4718.      
document_url: http://oar.icrisat.org/68/1/Mugo%2520et%2520al.pdf