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Evaluation of early-generation tropical maize testcrosses for grain-yield potential and weevil (Sitophilus zeamais Motschulsky) resistance

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Title Evaluation of early-generation tropical maize testcrosses for grain-yield potential and weevil (Sitophilus zeamais Motschulsky) resistance
 
Creator Sserumaga, Julius P.
Makumbi, Dan
Oikeh, Sylvester O.
Otim, Michael
Machida, Lewis
Anani, Bruce Y.
Nhamucho, Egas
Beyene, Yoseph
Mugo, Stephen
 
Subject zea maize
plant breeding
hybrids
stored products pests
pest resistance
germplasm
postharvest losses
fitomejoramiento
híbridos
plagas de productos almacenados
 
Description Smallholder maize farmers in Africa experience pre- and post-harvest production stresses either individually or in combination at different stages of the crop cycle. The maize weevil is among the major post-harvest storage pests. A strategy to address this problem is to develop and promote high yielding maize germplasm with resistance to multiple stresses. A study was conducted to: 1) assess yield and agronomic performance of testcross hybrids developed from early generation lines; and 2) assess the response of the testcross hybrids to infestation with Sitophilus zeamais. Fifty-eight drought-tolerant testcross hybrids were evaluated for agronomic performance and weevil resistance at four environments in Uganda in 2016. Hybrid G39 (L2/T2) had the best grain yield performance; it significantly out-performed the best check by 11.4% in all environments. Hybrid grain from field trials was subjected to Sitophilus zeamais infestation in a choice and no choice test under laboratory conditions. Hybrids G56 (L49/T2) and G58 (L51/T2) had the least weevil damage and were rated as resistant to Sitophilus zeamais. The numbers of damaged kernels, number of exit holes and ear aspect were positively correlated with the grain weight loss. The results suggest possibilities for simultaneous selection for high grain yield and storage insect pest resistance among drought-tolerant genotypes. Use of high-yielding and resistant maize hybrids to storage insect pest should be promoted for increased maize production and managing post-harvest losses due to the maize weevil in smallholder farming communities in Africa.
 
Date 2021-01
2021-01-11T14:11:41Z
2021-01-11T14:11:41Z
 
Type Journal Article
 
Identifier Sserumaga, J.P.; Makumbi, D.; Oikeh, S.O.; Otim, M.; Machida, L.; Anani, B.Y.; Nhamucho, E.; Beyene, Y.; Mugo, S. (2020) Evaluation of early-generation tropical maize testcrosses for grain-yield potential and weevil (Sitophilus zeamais Motschulsky) resistance. Crop Protection, Online first paper (7 September 2020) ISSN: 1873-6904
1873-6904
https://hdl.handle.net/10568/110819
https://doi.org/10.1016/j.cropro.2020.105384
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format application/pdf
 
Publisher Elsevier BV
 
Source Crop Protection