N. Mizutani et Y. Kunimi, Difference in response of egg parasitoid, Ooencyrtus nezarae Ishii (Hymenoptera : Encyrtidae) to eggs of two major host bug species, JPN J A ENT, 43(2), 1999, pp. 87-92
Citations number
15
Categorie Soggetti
Entomology/Pest Control
Journal title
JAPANESE JOURNAL OF APPLIED ENTOMOLOGY AND ZOOLOGY
The response of the egg parasitoid wasp, Ooencyrtus nezarae Ishii to eggs o
f the two host bugs, Riptortus clavatus and Piezodorus hybneri, was investi
gated in laboratory experiments. In a test tube, 80% to 100% of O. nezarae
female wasps parasitized eggs of R. clavatus, On the other hand, less than
60% of females parasitized egg masses of P. hybneri. The female wasps tende
d to attack R. clavatus first when provided with eggs of both R. clavatus a
nd P. hybneri in a test tube, and took more time to start oviposition behav
ior on P. hybneri eggs than on R. clavatus eggs. These results indicate tha
t O. nezarae females prefer R, clavatus eggs to P. hybneri eggs. The female
s' acceptance ratio for R. clavatus did not change after several generation
s reared on P. hybneri, suggesting that the preference for R. clavatus is p
artly determined genetically. Significantly higher survivorship was recorde
d in O. nezarae developed in eggs of R. clavatus than in eggs of P, hybneri
. In addition, female wasps emerging from R. clavatus showed greater fecund
ity and longevity. These findings suggest that the preference for R. clavat
us is correlated with the reproductive success of O. nezarae on R. clavatus
.