The biological activity of kumchura rhizome to melon fly: I. crude kumchura bioactivity

English. Kumchura (Kaempferia galanga, L.) rhizome, a herbal medicine and condiment used in many Asian countries, was known to possess licicidal quality. To ensure whether this quality extend to other insects, kumchura rhizome preparation was applied to eggs, larvae and adults of the melon fly, Bactrocera cucurbitae, Coquillet. Crude preparation of the rhizome was mixed with larval diet, which was also served as a common artificial egg-hatching medium. The preparation proved to be ovicidal at minimum concentration ratio of 1 : 4, kumchura: larval diet. No such larvicidal effects were seen at the same ratio, the effects observed were larval development inhibition and delay. The repellency tests, proportionally less melon flies were found on diet containing kumchura, but effect on oviposition was observed

unknown. Rimpang kencur (Kaempferia galanga, L.) yang banyak dipergunakan di berbagai negara Asia, diketahui memiliki kualitas sebagai pembunuh kutu kepala. Untuk mengetahui apakah kemampuan ini berpengaruh kepada serangga lain, suatu preparasi rimpang kencur diaplikasikan terhadap telur, larva, dan imago lalat buah mentimun (Bactrocera cucurbitae) Coquillet. Preparasi rimpang dicampur dengan pakan larva, yang juga digunakan untuk medium penetasan telur. Preparasi ini ternyata bersifat ovisidal pada nisbah konsentrasi minimum 1 : 4 (rimpang : pakan). Nisbah ini tidak menyebabkan kematian larva, namun perkembangan larva terhambat dan tertunda. Dalam uji penolakan bahan, secara proporsional semakin tinggi konsentrasi yang diujikan semakin sedikit lalat buah yang mendatangi, tetapi peletakan telur tidak dihambat