Aggressive Behavior in Paracentrobia andoi (Hymenoptera, Trichogrammatidae), an Egg Parasitoid of the Green Rice Leafhopper

The aggressive behavior between two females of Paracentrobia andoi, presumably to obtain host eggs for oviposition, was observed in the laboratory. Differing from the other egg parasitoid wasps whose behavior has been known so far, P. andoi showed no territorial defense, but a precursor female and an intruder female fight on a host egg mass. Most of the fights ceased when both females left the host egg mass. No settled winner was detected in the fight ; neither of the females succeeded in staying on the host egg mass as a result of the fight.