Reproductive Potential of Fall Armyworm Spodoptera Frugiperda (J.E. Smith) and Effects of Feeding on Diverse Maize Genotypes under Artificial Infestation
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Date
2022-09
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Frontiers in Insect Science
Abstract
Fall armyworm (FAW) Spodoptera frugiperda (J.E. Smith) has become a major
threat to maize production in Africa. In this study, six maize genotypes were
assessed for their resistance to FAW under artificial infestation in both
laboratory and net house conditions. These included two FAW-tolerant
hybrids (CKHFAW180294 and CKH191221), two commercial hybrids (WE2115
and CKH10717), and two open-pollinated varieties (ZM523 and KDV4). Larval
development time and reproductive potential were assessed on maize leaves in
the laboratory and a life table for FAW was constructed. The maize genotypes
were also artificially infested with three FAW neonates at two phenological
stages (V5 and V7) and reproductive stage (R1) in the net house. Leaf and ear
damage scores were recorded on a scale of 1–9. Larval development time
varied significantly between maize genotypes with the highest on CKH191221
(16.4 days) and the lowest on KDV4 (13.7 days). The intrinsic rate of natural
increase for life tables varied from 0.24 on CKH191221 to 0.41 on KDV4. Mean
generation time of FAW ranged from 17.6 to 22.8 days on KDV4 and
CKH191221, respectively. Foliar damage was the lowest on CKH191221, and
the highest on KDV4 at V7 infestation stage in week 1. CKH191221 had the
lowest ear damage score, whereas ZM523 had the highest scores at V5
infestation stage. The highest and lowest yield reductions were observed on
ZM523 (64%) at V7 infestation stage and CKHFAW180294 (6%) at R1 infestation
stage, respectively. The results indicated the potential for developing tropical
mid-altitude maize germplasm with native genetic resistance to FAW.
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Anyanda, G. N., Bruce, A. Y., Makumbi, D., Ahonsi, M., Kahuthia-Gathu, R., Namikoye, S. E., ... & Prasanna, B. M. (2022). Reproductive potential of fall armyworm Spodoptera frugiperda (JE Smith) and effects of feeding on diverse maize genotypes under artificial infestation. Frontiers in Insect Science, 2, 950815.