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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 1021-9730
Vol. 4, No. 3, 1996, pp. 345-350
Bioline Code: cs96074
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 345-350

 en The development of Riptorus dentipes Fabricius (hemiptera: alydidae) and damage caused on soybean
Ewete, F.K. & Joda, O.A.

Abstract

The development and damage caused by Riptorus dentipes 
Fabricius were studied on four varieties of soybean, TGX
536-02D, TGX 849-294D, TGX 996-28E and TGX 923-2E under
ambient temperature (24.2-27.8oC) and relative humidity
(88-92%). The  pre-oviposition period of adult females fed on 
TGX 536-02D, TGX 996-28E and TGX 849-294D were 5.0, 7.6 and 
8.2 days, respectively, while adults fed on TGX 923-2E died
within a week.  Oviposition period was relatively shorter on
TGX 849-294D than on TGX 536-02D and TGX 996-28E. 
Significantly higher number of eggs, 381.9, was laid by mated
females which fed on fresh maturing pods (R-7 stage) of TGX
536-02D compared to the lowest number of eggs, 142.1 and 162.8
on TGX 849-294D and TGX 996-28E, respectively.  There was no
development beyond the second instar nymph when reared on TGX
923-2E suggesting a high degree of antibiosis. A population of
two R. dentipes per plant significantly caused higher seed
damage, 66.3% and 82.5%, on TGX 849-294D and TGX 536-02D,
respectively, compared to 29.9% on TGX 996-28E.  A population
of eight R. dentipes per plant caused 99-100% seed damage on
TGX 536-02D and TGX 849-294D but 90.5% on TGX 996.28E.

Keywords
Damage, development, Glycine max, Riptorus dentipes

 
 fr
Ewete, F.K. & Joda, O.A.

Résumé

Le developpement et degat causes par Riptorus dentipes
Fabricus ont ete examines sur quatre varietes de graines de
soja, TGX 536-02D, TGX 849-294D, TGX996-28E et TGX-2E sous la
temperature (24.2-27.8 C) et l'humidite relative (entre 88 et
92%). La periode de pre-oviposition les femelles adultes se
nourrissent de TGX 923-2E. Le nombre sensiblement eleve des
oeufs, 381.9, (ont ete) pondus par les femelles qui se
nourrissent des gousses fraiches en maturite (R7T stade) du
TGX BG-536, comparees en mombre limite  du nombre inferieur,
1,421 et 162.8 sur TGX 996-28E respectivement.  Il n'y a pas
eu de developpement au del du instar nymp quond TGX 849-294,
TXG 993-6 suggrent un haut degre d'antibiosis.  Une
population de deux R. dentipes par plante qui causent
sensiblement un grand degat de la semince, dont 66.3% et
82.5%, sur les TGX 849-294D et TGX 536-02D respectivement
comparees  29.9% sur TGX 996-28E.  Une population de 8 R.
dentipes  par plante a causee entre 99 et 100% de degats sur
TGX 536-02D et TGX 849-294D mais 90.5% sur TGX 996.28E.

Mots Clés
Degat, developpement, Glycine max, Riptorus dentipes

 
© Copyright 1996 - African Crop Science Society

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