Direct Application of Synthetic Pyrethroid Insecticides on Clove Stem Borer ( Hexamitodera semivelutina Hell.)

摘要

Background and objective: Clove is Indonesia's main spice commodity and one of the 16 leading national plantation commodities. However, the production is not optimal due to the attack of clove stem borer ( Hexamithodera semivelutina ). This study was aimed to evaluate the effect of 4 commercial synthetic pyrethroid insecticides on stem borer that attacked clove plants. Materials and Methods: The experiment was conducted on clove plantation in Kombi District, Minahasa Regency, North Sulawesi. The method used in this study was an experimental method using a randomized block design (RBD) with 5 treatments and 4 replications. Determination of clove trees for the treatment was done intentionally by selecting the hoist holes caused by active stem borers. Symptoms that were shown on the stem of the plant were liquid discharge and also the remnants of the borehole found on the clove tree stem. Results: The results showed that pyrethroid insecticides H, V, B and M were able to heal the wound/hoist holes on the clove plant stem. The most effective pyrethroid insecticides were B and M which cured almost all of the boreholes. The effectiveness of each insecticide was as follows: B (100%), M (95%), H (55%) and V (50%). Conclusion: The data revealed that a combination of synthetic pyrethroid insecticide prallethrin 0.1%, cypermethrin 0.1% and transfluthrin 0.1% was the most effective in controlling the stem borer larvae.