Determination of Number of Instars of Rhyssomatus subtilis (Coleoptera: Curculionidae) Based on Head Capsule Widths

Rhyssomatus subtilis Fiedler (Coleoptera: Curculionidae) is an important pest of the soybean crop in northwestern Argentina. Few studies have been made on specific parameters of its life history and ecology. The aim of this study was to determine the number of larval stages of R. subtilis. One thous...

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Bibliographic Details
Published in:The Florida entomologist 2014-06, Vol.97 (2), p.639-643
Main Authors: Cazado, L. E, Van Nieuwenhove, G. A, O'brien, C. W, Gastaminza, G. A, Murúa, M. G
Format: Article
Language:English
Subjects:
Adult insects
Beetles
black soybean weevil
ciclo de vida
Control
Curculionidae
data analysis
Diseases and pests
Dyar's rule
ecology
Hcap program
head
Insect larvae
Insect-plant relationships
Instars
larvae
Larval development
life cycle
life history
linear models
Moths
pest
Pests
picudo negro de la soja
plaga
Plants
programa Hcap
regla de Dyar
regression analysis
RESEARCH PAPERS
Soybean
Soybeans
Weevils
Zoological research
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Summary:Rhyssomatus subtilis Fiedler (Coleoptera: Curculionidae) is an important pest of the soybean crop in northwestern Argentina. Few studies have been made on specific parameters of its life history and ecology. The aim of this study was to determine the number of larval stages of R. subtilis. One thousand and eighteen larvae were collected from soybean plants during 2 yr (2011 and 2013), and head capsule width of each larva was measured. For analysis of data, the Hcap program and Dyar's rule were used. The Hcap program showed 4 different peaks in the frequency distribution of the head capsule widths. This result also agreed with Dyar's rule that revealed a perfect geometric larval growth pattern for each instar by regression analysis. The excellent fit to a linear model, indicates that no instar was overlooked. This research identified 4 instars for R. subtilis.
ISSN:0015-4040
1938-5102
DOI:10.1653/024.097.0241