Next Article in Journal
Resistance to Permethrin, β-cyfluthrin, and Diazinon in Florida Horn Fly Populations
Previous Article in Journal
Frequent Insect Visitors Are Not Always Pollen Carriers in Hybrid Carrot Pollination
Article Menu

Export Article

Open AccessArticle
Insects 2018, 9(2), 62; https://doi.org/10.3390/insects9020062

Expression of Resistance in Amaranthus spp. (Caryophyllales: Amaranthaceae): Effects of Selected Accessions on the Behaviour and Biology of the Amaranth Leaf-Webber, Spoladea recurvalis (Lepidoptera: Crambidae)

1
Kenyatta University, School of Agriculture and Enterprise Development, P.O. Box 43844-00100, Nairobi, Kenya
2
International Centre of Insect Physiology and Ecology (ICIPE), Plant Health Unit, P.O. Box 30772-00100, Nairobi, Kenya
3
World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan
4
World Vegetable Center, Eastern and Southern Africa, P.O. Box 10, Duluti, Arusha, Tanzania
*
Author to whom correspondence should be addressed.
Received: 16 April 2018 / Revised: 4 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
Full-Text   |   PDF [1270 KB, uploaded 8 June 2018]   |  

Abstract

Spoladea recurvalis F. is a major pest moth of amaranth (Amaranthus spp.) flowers worldwide, with a potential of causing complete foliage loss under severe outbreaks. Chemical insecticides are uneconomical for resource-poor farmers and pose health and environmental risks. Host plant resistance (HPR) to insects is an effective, economical and environmentally friendly alternative that is poorly understood and largely unexploited among traditional leafy vegetables. A total of 35 amaranth accessions were evaluated for the expression of their antixenotic and antibiotic traits against S. recurvalis, focusing on their effects on the biology of the pest in comparison with a susceptible accession. The accession VI036227 was found to be highly resistant against the pest, exhibiting exemplary antibiosis by causing 100% larval mortality within the first 36 h, despite not being deterrent for oviposition. The accessions VI048076, VI056563 and VI047555-B demonstrated moderate resistance against the pest for specific parameters including low oviposition, moderate early stage larval mortality and reduced adult longevity. Total mortality and weight gain in these three accessions were, however, not significantly different from the susceptible control. Higher numbers of eggs were laid in no-choice compared to choice situations. The implications of these findings in the management of S. recurvalis on amaranths are discussed. View Full-Text
Keywords: antibiosis; antixenosis; IPM; longevity; mortality antibiosis; antixenosis; IPM; longevity; mortality
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Othim, S.T.O.; Ramasamy, S.; Kahuthia-Gathu, R.; Dubois, T.; Ekesi, S.; Fiaboe, K.K.M. Expression of Resistance in Amaranthus spp. (Caryophyllales: Amaranthaceae): Effects of Selected Accessions on the Behaviour and Biology of the Amaranth Leaf-Webber, Spoladea recurvalis (Lepidoptera: Crambidae). Insects 2018, 9, 62.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Insects EISSN 2075-4450 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top