Screening for resistance against major lepidopteran and stem weevil pests of amaranth in Tanzania
| Autor: | Thomas Dubois, Sunday Ekesi, F. F. Dinssa, S. T. O. Othim, Komi K M Fiaboe, R. Kahuthia-Gathu, Ramasamy Srinivasan |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Wet season Integrated pest management Resistance (ecology) Weevil Introgression Amaranth Plant Science Horticulture Biology biology.organism_classification 01 natural sciences 010602 entomology chemistry.chemical_compound Agronomy chemistry Genetics PEST analysis Agronomy and Crop Science Cropping 010606 plant biology & botany |
| Zdroj: | Euphytica. 214 |
| ISSN: | 1573-5060 0014-2336 |
| DOI: | 10.1007/s10681-018-2269-1 |
| Popis: | Insect pests pose major challenges to optimum productivity of amaranth in Africa and Asia. The use of insecticides is the main control strategy, but is expensive and may pose health and environmental concerns, especially if proper care is not taken. Host plant resistance offers a cheap and sustainable pest management alternative. Open field experiments were conducted during two cropping seasons in 2016 and 2017 to screen 35 amaranth accessions and lines for resistance to leaf-webbers and stem weevils. The diversity (H) of lepidopteran defoliators and their parasitoids on each accession ranged from 0.00 to 1.57 and 0.00 to 1.65, respectively during the long rainy season and from 0.00 to 1.58 and 0.00 to 1.01 in the short rainy season. Accessions VI036227, RVI00027, VI054569, VI033487, VI044432, VI048076, VI049639, VI049530 and VI049698 had high levels of pest resistance with significantly lower infestations (≤ 11.11 ± 2.14%) and damage (≤ 68.06 ± 3.90%) by leaf-webbers and leaf-worms. Stem weevil infestations ranged from 68.70 ± 2.0% to 90.42 ± 1.0% during the long and short rainy seasons, respectively. Accessions VI047517-B, VI036227 and VI056563 had the least stem weevil infestations ( |
| Databáze: | OpenAIRE |
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