The development of Riptorus dentipes Fabricius (hemiptera: alydidae) and damage caused on soybean

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.

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.