The field performance of palm emulsion in water (EW)-cypermethrin against rhinoceros beetles, Oryctes rhinoceros in immature oil palm was studied with respect to its insecticidal activities and phytotoxic effect on young palms. The conventional emulsifiable concentrate (EC)-cypermethrin and another commercial product (gamma-cyhalothrin) were included for comparison. The trial was carried out on one-year-old replants in an oil palm estate (Sime Darby Plantation) in Labu, Negeri Sembilan. The chemicals were applied to the crown and spears of immature palms at two-weekly intervals, and the infestation by rhinoceros beetle was assessed at regular intervals for about nine months. During the trial period, no phytotoxic symptoms were observed in all treatments. Generally, beetle infestation in the trial plots declined over time. However, overall beetle damage in all treated plots was much lower than in the control. Statistical analysis on cumulative beetle attacks after three and eight months showed that palm EW-cypermethrin at 0.028% a.i. and 0.056% a.i. provided significant control (more than 80%) of the rhinoceros beetle. There was no significant difference between plots treated with palm EW-cypermethrin and the commercial products (i.e., EC-cypermethrin and capsulated suspension [(CS)-gamma-cyhalothrin]), in the control of the rhinoceros beetle.

Kajian keberkesanan racun serangga jenis emulsi minyak dalam air (EW)-cypermethrin untuk mengawal kumbang badak, Oryctes rhinoceros di ladang sawit muda telah dibuat dengan memberi tumpuan kepada aktiviti insektisid dan kesan fitotoksisiti pada pokok sawit. Racun serangga konvensional jenis emulsi terpekat (EC)-cypermethrin dan produk komersial suspensi kapsul (CS)-gamacyhalothrin diguna sebagai bandingan. Kajian telah dijalankan ke atas tanaman sawit semula di Ladang Labu(Sime Darby Plantation), Negeri Sembilan. Bahan kimia disembur ke atas pucuk atau umbut sawit muda sekali setiap dua minggu, dan pembiakan kumbang badak ditentukan dalam tempoh sembilan bulan. Semasa kajian dijalankan, tanda kesan fitotosik tidak diperhatikan pada semua rawatan. Pada umumnya, serangan kumbang badak di petak rawatan semakin berkurangan mengikut tempoh kajian. Walau bagaimanapun, kematian atau kerosakan pokok disebabkan oleh kumbang badak di petak rawatan adalah jauh lebih rendah berbanding dengan petak tanpa rawatan. Analisis statistik secara kumulatif ke atas serangan kumbang badak pada tiga dan lapan bulan selepas rawatan menunjukkan bahawa EW-cypermethrin pada kadar 0.028% dan 0.056% bahan aktif memberi kesan yang ketara (sehingga 80% kawalan) bagi mengawal kumbang badak. Tiada perbezaan yang ketara antara petak yang dirawat dengan EW-cypermethrin dan petak yang dirawat dengan produk komersial (EC-cypermethrin dan CS-gama-cyhalothrin) untuk mengawal kumbang badak.