Yield Response of Determinate Chipping Potato to Artificial Defoliation

Author:

Hoback W Wyatt1ORCID,Hayashida Rafael2ORCID,Ziems Jesse3,Zechmann Ben3,de Freitas Bueno Adeney4,Higley Leon G5

Affiliation:

1. Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK

2. Departamento de Biologia, Federal University of Parana, Curitiba, PR, Brazil

3. CSS Farms, Minden, NE

4. Embrapa Soja, Londrina, PR, Brazil

5. School of Natural Resources, University of Nebraska, Lincoln, NE

Abstract

Abstract The relationship between canopy defoliation by insects and yield loss in potato (Solanum tuberosum L.) has been extensively researched. However, detailed analysis of varieties with different properties and examination of methods of defoliation are still lacking. Absence of research results has led many producers to use a very conservative economic threshold (ET) of 10% defoliation in the management of insect defoliators. A series of leaf removal experiments was conducted on a determinate chipping variety of potato at different plant stages. In 2002, the highest levels of defoliation induced upon the plant canopy were 50, 30, and 75% for tuber initiation, full bloom, and plant maturity stages, respectively. In 2003, defoliation levels were increased to 70, 80, and 90% for tuber initiation, full bloom, and plant maturity, respectively. Total yield was unaffected, and no significant changes in market sized yield, or number of marketable tubers were observed at any growth stage in either year. Because the determinate variety showed remarkable ability to recover from substantial defoliation, two different methods of defoliation: hand cut (cutting the edge of leaves with scissors while avoiding the midrib) and hole punching (hole-punching leaf tissue [15.08-mm diameter] while avoiding midrib) were tested. Although total yield was unaffected, marketable yield and small potato yield were reduced, Thus, although defoliation methods must be considered, a 10% defoliation ET is exceedingly conservative and an ET of 60% for all stages of determinate chipping potato could be adopted by growers.

Publisher

Oxford University Press (OUP)

Subject

Insect Science,Ecology,General Medicine

Reference31 articles.

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4. Growth analysis of potato plants damaged by Colorado potato beetle (Coleoptera: Chrysomelidae) at different plant growth stages;Dripps;Environ. Entomol,1989

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