ABSTRAK
ROIMEN ROYANTO MALAU. Uji Infeksi Cylindrocladiumsp. Pada Tiga Klon Hibrid Turunan Eucalyptus grandis xEucalyptus urophylladi PT. Toba Pulp Lestari, Tbk Porsea. Di bawah bimbingan Dr. Ir. EDY BATARA MULYA SIREGAR, MS dan RIDAHATI RAMBEY S. Hut,. M.Si.
Salah satu penyakit yang menyerang bibit Eukaliptus adalah Cylindrocladium
yang menyebabkan penyakit Cylindrocladium foliar spot dan foliar blight. PT Toba Pulp Lestari mengembangkan banyak jenis klon dengan cara vegetative. Penelitian ini bertujuan untuk mengkarakterisasi gejala penyakit daun, mengukur tingkat intensitas serangan, luas serangan, serta reaksi tanaman (resistensi) terhadap infeksi Cylindrocladium sp. pada tiga klon hybrid Eukaliptus. Klon yang di uji adalah IND 68, IND 70, IND 73. Inokulasi dilakukan dengan cara penyemprotan. Pengamatan gejala dilakukan setiap hari sejak inokulasi dilaksanakan. Hasil pengamatan menunjukkan bahwa gejala yang muncul adalah sama. Gejala diawali dengan bintik coklat kekuningan lalu akan melebar (nekrotik) dan berlanjut pada kematian jaringan daun. Berdasarkan kriteria penilaian tingkat intensitas serangan dan luas serangan, ketiga jenis klon termasuk dalam kategori resisten.
Kata kunci : Eukaliptus sp, Cylindroladium sp, Uji Infeksi, Resisten.
ABSTRACT
ROIMEN ROYANTO MALAU. Infection Test Cylindrocladiumsp. on Three Hybrid Clones of Eucalyptus grandis x Eucalyptus urophylla in PT. Toba Pulp Lestari Tbk. Under academic supervision byDr. Ir. EDY BATARA MULYA SIREGAR, MS and RIDAHATI RAMBEY S. Hut,. M.Si.
One of the diseases that attack eucalyptus seedling are Cylindrocladium causing Cylindrocladium foliar spots and foliar blight diseases. Eucalyptus clones developed by PT Toba Pulp Lestari done by vegetative propagation. This study aimed to characterize the symptoms of the diseases leaves, measure the level of intensity of attack, widespread attack, as well as the reactions of plants (resistance) against infection Cylindrocladium sp. on three eucalyptus hybrid clones. Type clone which tested were IND 68, IND 70 and IND 73. Inoculation was conducted by spraying. Observation of symptoms is done every day since inoculation implemented. The result showed that the symptoms same. Symptoms caused by infection Cylindrocladium sp. is blight. Symptoms begin with yellowish brown spots and will be widened (necrotic) and continues in death of leaf tissue. Based on the assessment criteria and the level of intensity of widespread attacks, all three types are included in category of resistant clones.
Keywords: Eucalyptus, Cylindrocladium sp, Infection Test, Resistant.
