New approaches to the control of Neodiprion sertifer (Geoffroy, 1785) (Hymenoptera: Diprionidae)

Abstract

Neodiprion sertifer (Geoffroy) (Hymenoptera: Diprionidae) is a major pest on Pinus spp. in Europe. In this study, new control methods were tried to control N. sertifer. The effectiveness of Bauveria bassiana (Nostalgist, Bb %1.5 1 x 10 8 kob /ml min, 250 ml/100L), azadirachtin (Nimbecidine, 0.3g azadirachtin/l, 500 ml/da-100L; Nimiks4.5, 40g azadirachtin /l, 200 ml/100L; Neem Azal ®-T/S, 10 g azadirachtin /l, 300ml/100L) and spinosad (Oread, 480 g spinosad/l, 10ml/100L) was tested on N. sertifer larvae. In addition, the effect of the idiobiont parasitoid Bracon hebetor (Say) (Hymenoptera: Braconidae) venom was evaluated. Bauveria bassiana, spinosad and azadirachtin were applied to the larvae by spraying method. Different numbers of B. hebetor females (1-5 females) were also tested on N. sertifer larvae. All experiments were carried out at 25 ± 1°C, 60-70% relative humidity and 16L:8D h photoperiod. After B. bassiana application, the survival rates were 71.66% and 61.66% at the 6th day and 7th day. The maximum efficacy was obtained with azadirachtin in Nimiks 4.5 (40 g azadirachtin/l). The highest mortality (100.0%) was found at 24 h after the application of spinosad (10ml/100l). The most effective combination of B. hebetor female venom on N. sertifer larvae is 5 females and 7 days duration. The study shows that spinosad, azadirachtin and B. hebetor female venom can achieve effective control of N. sertifer larvae.