1. Potential for injury from different life stages of Diceraeus melacanthus and Euschistus heros (Hemiptera: Pentatomidae) on corn seedlings
- Author
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Robert L. Koch, G. Melotto, Edson Luiz Lopes Baldin, Leandro do Prado Ribeiro, Thais Lohaine Braga dos Santos, Ivana Fernandes da Silva, Nádia Maebara Bueno, Universidade Estadual Paulista (Unesp), Fed Univ Grande Dourados, Agr Res & Rural Extens Co Santa Catarina, and Univ Minnesota
- Subjects
biology ,Nymphal injury ,Plant Science ,Pentatomidae ,biology.organism_classification ,medicine.disease_cause ,Hemiptera ,Horticulture ,Dry weight ,Seedling ,Insect Science ,Green belly stink bug ,Infestation ,medicine ,Instar ,PEST analysis ,Zea mays L ,Nymph ,Neotropical brown stink bug - Abstract
Made available in DSpace on 2021-06-25T12:16:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-05-21 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Changes in Brazilian corn production practices, have favored stink bugs, which feed on corn seedlings. Diceraeus melacanthus (Dallas) (Hemiptera: Pentatomidae), is a key pest in corn, and Euschistus heros (F.) (Hemiptera: Pentatomidae) is an emerging threat to corn. Economic thresholds (ET) for management of stink bugs are usually calculated based on the injury caused by adults. However, little is known about the impact of stink bug nymphs on corn seedlings. Thus, this work evaluated the effects of infestation with different nymphal instars on corn seedling weight (fresh and dry), plant height and stalk diameter. We also classified the level of overall injury to the seedlings using a rating scale. Corn seedlings in the V3 stage were infested with two insects of either D. melacanthus or E. heros in the 2(nd), 3(rd), 4(th), 5(th) instars or adult stage in separate greenhouse studies performed for each species. Plants without infestation were used as controls. Both species of stink bugs feeding on corn seedlings affected all the assessed parameters. The quantitative measures of seedling size (i.e., fresh weight, dry weight, plant height and stem diameter) were generally most severely affected by the 5(th) instars and adults of D. melacanthus and the 4(th) instars of E. heros. The qualitative injury rating scale generally showed a greater impact to seedlings by 3(rd) instar to adult life stages of each species. Across life stages, injury to seedlings caused by D. melacanthus was numerically greater than that from E. heros. These results will guide the development of a more accurate ETs for stink bug management on seedling corn plants. Sao Paulo State Univ, Sch Agr, Dept Crop Protect, BR-18610034 Botucatu, SP, Brazil Fed Univ Grande Dourados, Dept Entomol & Biodivers Conservat, BR-79804970 Dourados, MS, Brazil Agr Res & Rural Extens Co Santa Catarina, BR-89801970 Chapeco, SC, Brazil Univ Minnesota, Dept Entomol, St Paul, MN 55108 USA Sao Paulo State Univ, Sch Agr, Dept Crop Protect, BR-18610034 Botucatu, SP, Brazil CAPES: 001 CNPq: 303892/2016-1
- Published
- 2021
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