RESPONS BEBERAPA KLON JATI TERHADAP SERANGAN ULAT JATI Hyblaea puera Cramer

DAIM MUNAWAROH, Ir. Sumardi, M.For.Sc.; Dr. Ir. Musyafa’

2003 | Skripsi | S1 KEHUTANAN

Ulat Jati, H. puera merupakan salah satu hama penting tanaman jati yang menyerang daun pada awal musim hujan, segera setelah flushing. Seleksi klon untuk menghasilkan tanaman jati dengan kualitas yang tinggi telah dilakuakan di Indonesia. Tetapi, informasi mengenai klon-klon jati yang mempunyai ketahanan H . puera belum ada. Penelitian ini bertujuan untuk mempelajari tingkat serangan H. puera pada beberapa klon jati di kebun klon dan aktivitas makan , preferensi dan pertumbuhan ulat jati pada beberapa klon jati . Penelitian tingkat serangan ulat jati dilakukan dengan mengamati kerusakan daun jati pada 20 klon jati di kebun klon Cepu . Aktivitas makan, preferensi dan pertumbuhan ulat jati dilakukan dengan cara memberi makan ulat jati dengan daun beberapa klon jati di Laboratorium dan diamati tingkat konsumsi dan pertambanah berat ulat jati. Respons klon jati terhadap serangan di lapangan menunjukkan adanya perbedaan respons di lapangan. Klon no 13 dan 20 mempunyai intensitas serangan yang tinggi . Penelitian di laboratorium menunjukkan tingkat konsumsi klon 13 dan 20 lebih tinggi dari pada klon yang lain , dan ini menunjukkan preferensi ulat jati pada klon 13 dan 20. Pertumbuhan ulat jati pada klon 13 lebih tinggi dibandingkan yang lain .

Teak, defoliator, H. puera is one of the most destructive pests of teak plantation, feeding on the leaves during the early of rainy season, soon after flushing. Clone selection to produce high quality teak plantation has been done in Indonesia . However, information on teak clones which is resistant to teak defoliator is not available. The research was aimed at studying the degree of teak defoliation by H . puera in teak clone bank, feeding activity, food preference and the growth of larvae offered with the leaves of some teak clones. Research on the degree of defoliation was done by observing intensity of H . puera attack on twenty teak clones in Cepu clone bank. Experiment on feeding activity, food preference and the growth of H. puera larvae were done in Teak Center in Cepu. Larvae of H . puera were fed with fresh leaves of some teak clones. Consumption rate and the growth of H. puera were determined . The teak clones showed different response to the attack of teak defoliator in clone bank . The highest defoliation was fouond on clones number 13 and 20 . Consumption rate of larvae offered with the leaves of clones number 13 and 20 was the highest and it indicated clones number 13 and 20 were the most preferred. The larvae fed with leaves of clone number 13 had the highest growth rate.

Kata Kunci : Respons, Jati, H. puera