Breeding for Resistance to Insect Pests in Maize

Karjagi, Chikkappa G.; Sekhar, J. C.; Lakshmi, Soujanya P.; Suby, S. B.; Kaur, Jatinder; Mallikarjuna, Mallana Gowdra; Kumar, Pradyumn

doi:10.1007/978-981-10-6056-4_7

Cited by 4 publications

(1 citation statement)

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“…Maize ( Zea mays mays L.) crops are constantly affected by abiotic and biotic stresses, including attack of pest insects, which are the main biotic stressors impacting crop yield [ 1 , 2 ]. Fall armyworm (hereafter FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is one of the most important insect pests affecting maize crops in the Americas [ 3 , 4 , 5 ], mainly due to the polyphagous habit of the species [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Tolerance Levels of Maize Landraces and a Hybrid to Natural Infestation of Fall Armyworm

Lima

Venâncio

Souza

et al. 2022

Insects

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Insect pests such as Spodoptera frugiperda cause significant losses to maize (Zea mays mays). Control of S. frugiperda is difficult, but the use of insect resistant cultivars, including tolerant cultivars, is a promising alternative, and landraces are a potential source of insect resistance. This study investigated tolerance to S. frugiperda in five Brazilian landraces, Amarelão, Aztequinha, Branco Antigo, Palha Roxa, and São Pedro, in relation to one conventional (non-Bt) hybrid, BM207, under field conditions. We assessed tolerance as the ratio of insecticide-free to insecticide-protected plants for plant height, stem diameter, and leaf chlorophyll content at two plant stages. Tolerance ratios varied across the maize genotypes, but inconsistently across plant variables, and cluster analysis revealed three groups based on tolerance ratios. A first group contained genotypes similarly tolerant to S. frugiperda, BM207, Palha Roxa, São Pedro, and Aztequinha, while the second and third groups each contained single genotypes, Amarelão, and Branco Antigo, which were considered not tolerant. Overall, the landraces Palha Roxa, São Pedro, and Aztequinha compared favorably to BM207 in terms of tolerance, and therefore may be valuable for management of this pest, and as germplasm sources to improve tolerance in other cultivars.

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