Node-injury scale to evaluate root injury by corn rootworms (Coleoptera: Chrysomelidae).
J Econ Entomol
; 98(1): 1-8, 2005 Feb.
Article
em En
| MEDLINE
| ID: mdl-15765660
ABSTRACT
Corn rootworm larval feeding on corn roots can significantly reduce grain yield by interfering with photosynthetic rates, limiting the uptake of water and nutrients, and by increasing the plant's susceptibility to lodging. Of the techniques developed to measure the efficacy of corn rootworm larval control tactics, root damage ratings have generally been adopted as the standard because sampling roots is relatively efficient. Historically, the primary scales used for scoring root injury from corn rootworm larval feeding have been the 1-6 and 1-9 scales. A critical deficiency of those scales, however, is that each increase in a root-rating score does not reflect a linear increase in the actual amount of injury to the root system. This results in injury scores that are expressed qualitatively. We developed the node-injury scale to more accurately quantify corn rootworm larval injury based on the proportion of nodal roots that contain feeding injury. With the node-injury scale, the relationship between the numerical scale and the amount of root injury is linear and intuitive. In this article, we describe the node-injury scale, discuss sampling issues to consider when using the scale, and suggest the minimum node-injury score that causes economic damage under varying degrees of environmental stress.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
/
Besouros
/
Raízes de Plantas
/
Zea mays
Limite:
Animals
Idioma:
En
Revista:
J Econ Entomol
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos