KETERLIBATAN PESTALOTIA DALAM PENYAKIT BERCAK DAUN SEMAI PlNUS MERKUSII THE INVOLVEMENT OF PESTALOTIA IN PINE SEEDLING LEAF SPOT DISEASE

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2001
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/24626/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=7604
• Institution: Universitas Gadjah Mada

As the current trend of pine plantation covers areas out of its natural distribution, the threat of disease is increasing. Leaf spot disease, which normally occurs sporadically and causes no significance losses, is now becoming the prevalence disease problem in some pine nursery centers in Java, Aceh and North Sumatra. The aim of study was to isolate the causal agent of leaf spot disease in pine seedling and proved its pathogenicity. The result indicated that Pestalotia sp. was the single isolate involved in leaf spot disease of pine seedling tested. The fungi was consistently found in the growing medium used and characterized by the multicelluler hyaline conidia with seta developed on the opposite ends of the conidia. The results of pathogenicity test convinced that the isolate was the causal agent as shown by the same symptoms as those developed in the original diseased seedlings. The initial symptom observed was a tiny spot occurred on the needle and later on became bigger. More than one spot might developed in a single needle and causing serious leaf injury. Reisolation and cultivation of causal agent from inoculated seedlings obtained an isolate of Pestalotia sp. having the similar properties, consistenly correlated with that isolated from the initial isolation. Keywords: Pestalotia, leaf spot, pine seedling