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Sweetpotato weevil (Cylas spp.) resistance in African sweetpotato germplasm

Sweetpotato weevil (Cylas spp.) resistance in African sweetpotato germplasm

Muyinza, Harriet, Talwana, Herbert L., Mwanga, Robert O.M. and Stevenson, Philip C. (2012) Sweetpotato weevil (Cylas spp.) resistance in African sweetpotato germplasm. International Journal of Pest Management, 58 (1). pp. 73-81. ISSN 0967-0874 (Print), 1366-5863 (Online) (doi:10.1080/09670874.2012.655701)

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Abstract

Host-plant resistance could be a useful tool for managing the weevils Cylas puncticollis and C. brunneus, which are major insect pests of sweetpotato in Africa. There is currently little information on existing resistance mechanisms against Cylas spp. in African cultivars, except where lower levels of weevil damage were attributed to escape due to deep rooting and reduced soil cracking, limiting the exposure of roots to weevils. Here, we evaluate weevil resistance in 134 sweetpotato cultivars and landraces over two seasons in two agroecologically diverse locations. Several sweetpotato cultivars, including New Kawogo, expressed resistance to Cylas spp. The resistance characteristics have been demonstrated in previous laboratory experiments to be quantifiable and thus potentially useful in targeted plant-breeding against Cylas spp. We showed external root and stem base damage to be an accurate quantitative indicator of internal root damage, offering rapid and accurate evaluation of resistance in field trials for screening. Moreover, weevil resistance can be assessed earlier in plant development, so saving time in the selection of the progeny from breeding programmes.

Item Type: Article
Uncontrolled Keywords: cylas brunneus, cylas puncticollis, host-plant resistance, sweetpotato breeding, root damage
Subjects: S Agriculture > S Agriculture (General)
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science
Related URLs:
Last Modified: 10 Jul 2015 17:03
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/7832

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