Impact of defoliation on yield of group IV soybeans in Mississippi |
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| Affiliation: | 1. Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, 100 Twelve Lane Mississippi State, MS 39762, USA;2. Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Delta Research and Extension Center, 82 Stoneville Rd P.O. Box 197, Stoneville, MS 38776, USA;3. Southern Insect Management Research Unit, 141 Experiment Station Rd P.O. Box 346, Stoneville, MS 38776, USA;1. Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Áridas, Centro Científico Tecnológico-Consejo Nacional de Investigaciones Científicas y Técnicas, Mendoza, CC 507, 5500 Mendoza, Argentina.;2. Instituto Superior de Entomología, Instituto y Fundación Miguel Lillo, 4000 San Miguel de Tucumán, Tucumán, Argentina.;1. Department of Agronomy, Iowa State University, Ames, IA, United States;2. UMR MIA 518, AgroParisTech, INRAE, Université Paris-Saclay, Palaiseau, France;3. Institut Technique de la Betterave, Paris, France;1. Instítuto Superior Politécnico de Manica (ISPM) - Divisão de Agricultura (DivAG), P.O Box 417, Manica, Mozambique;2. Department of Crops, Horticulture, and Soils (CHS), Egerton University, P.O Box 536, 20115 Egerton, Kenya;1. Department of Entomology, Michigan State University, East Lansing, MI 48824, United States;2. Department of Entomology, Philip E. Marucci Center, Rutgers University, Chatsworth, NJ 08019, United States;1. Department of Entomology, Federal University of Viçosa, 36570-000 Viçosa, Minas Gerais, Brazil;2. Agriculture and Livestock Research Enterprise of Minas Gerais (EPAMIG), Vila Gianetti 46, 36570-000 Viçosa, Minas Gerais, Brazil;3. Soil Science Department, Federal University of Viçosa, 36570-000 Viçosa, Minas Gerais, Brazil;4. Department of Evolutionary and Population Biology, Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands;1. North Carolina State University, Department of Entomology and Plant Pathology, Mountain Horticultural Crops Research and Education Center, 455 Research Drive, Mills River, NC, 28759, USA;2. Department of Entomology and Plant Pathology, North Carolina State University, Research Annex West A. Raleigh, NC, 27695, USA |
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| Abstract: | Field experiments were conducted during 2009 and 2010 to evaluate the effects of defoliation on maturity group IV soybeans, Glycine max (L.) Merr., grown in Mississippi. During each year, two locations were planted with maturity group IV soybeans that were subjected to various levels of defoliation during R3, R5, and R6 growth stages. Soybeans were subjected to various levels of defoliation within the upper 50% of the plant canopy, lower 50% of the plant canopy, and whole-plant canopy. There was greater yield loss from defoliation occurring in the upper plant canopy compared with the lower plant canopy during R3 and R5 stages, but no difference between canopy regions during R6 stage. Yield loss from whole plant defoliation was greater than upper or lower canopy defoliation. Results confirmed that soybeans during R3 and R5 stages are more susceptible to yield loss than during R6. However, yield losses were not significantly different between R 3 and R5 until defoliation exceeded 63%. Dynamic economic injury levels were determined for each growth stage based on yield loss equations, value of the crop, and cost of control and can be used as a basis for developing action thresholds in high-yielding soybean production environments. |
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| Keywords: | Defoliation Economic injury level Threshold |
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