%0 Journal Article
%T Parasitism Preference of Hyposoter didymator on the Young Instars of Helicoverpa armigera
%A Yal£¿£¿n Kondur
%J -
%D 2018
%X The young instars (1-3.th instars) of Helicoverpa armigera (H¨¹bner) (Lepidoptera: Noctuidae) were used in order to determine parasitism preference of the parasitoid Hyposoter didymator (Thun.) (Hymenoptera: Ichneumonidae) which may develop inside H.armigera larvae. The experiment was designed as randomized plots with 3 replicates. Each replicate consisted of 3 female parasitoids and 20 of each instar (20 of 1st instar, 20 of 2nd instar and 20 of 3rd instar H.armigera larvae) for each parasitoid female. In the experiments, one of 1st, 2nd and 3rd instar larvae and an experienced H.didymator female were inserted into a petri dish and then observed for parasitism. The parasitized larva that H.didymator inserted her ovipositor was immediately removed from the petri dish and another larva from the same category (1st, 2nd or 3rd instar larva) was inserted into the petri dish. This procedure was continued until 20 host larvae were parasitized. Parasitized larvae were inserted into transparent cylinders of 100 ml volume with artificial insect diet. The cylinders were stored in the growth chamber at 25¡À1¡ãC temperature and 65%¡À5 humidity. The parasitized larvae were dissected at Ringer¡¯s solution under a stereomicroscope and the eggs of the parasitoid were searched since the parasitoid eggs could easily be seen after 24 hours later than the parasitism. After dissection and inspection, the larvae with parasitoid egg were accepted as preferred by the parasitoid and the parasitism ratios (%) for 1st, 2nd and 3rd instar H.armigera larvae by H.didymator were calculated then compared via ANOVA with Tukey¡¯s-b multiple comparison tests using SPSS software. Results show that the host instar preferences of H.didymator females were significantly different (F(2,24)=38,055; P<0,05) and the most preferred H.armigera instar was the 3rd instar (52%), then the 2nd instar (32%). The least preferred H.armigera instar was the 1st instar (16%). We believe that these results may be useful in H.didymator breeding programs
%K Hyposoter didymator
%K Helicoverpa armigera
%K konuk£¿u d£¿nemi tercihi
%U http://dergipark.org.tr/ajfr/issue/38766/431412