Isolasi, identifikasi dan karakterisasi penyebab penyakit bercak daun pada semai pinus di perum perhutani BKPH Purworejo, KPH Kedu Selatan

Abstract

Pinus merkusii, a multiuse tree, is cultivated at Indonesian Plantation. Pinus plantation have been threatened by rust/spot leaf disease. The pathogen has infected pinus seedlings at Perum Perhutani, BKPH Purworejo, KPH Kedu Selatan and cause high mortality. The aims of this research to identify pathogen causing rust/spot leaf thus information how to control can be observed. Pathogens were isolated from infected leaves, and grown on the potato dextrose agar (PDA) and observed macroscopis and microscopis and identified. The pathogens also were inoculated to healthy seedlings (Postulat Koch Test). The result shows that pathogen causing rust/spot leaf on seedlings pine is Pestalotia sp with characteristic white colony, hypha has aservuli with conidia that have 25 septums and at the edge, some structure looks like feather whipped 3-5. Potulat Koch test indicated that inoculated healthy seedling shows similar symptom with infected seedlings. Rust/spot leaf has similar sympto and sign. Spot or rust appear on leaves started from edge and spread to base. At first, spots were formed in small size and separate each other but they developed and became larger and wider and fused.

Fungal Pathogen Prevalence in Myristica fragrans Houtt. (Nutmeg) Nurseries: Insights from Central Sulawesi, Indonesia

“…Subsequently, the spots enlarge and merge into blotches that cover the leaf surface, partially or entirely (Figure 2). In severe symptoms, the leaves experience chlorosis, namely premature yellowing of leaves in which the plant eventually dies [21][22][23]. The isolate of Pestalotia sp.…”

Evaluasi Mutu Fisik Bibit Eukaliptus (Eucalyptus pellita F. Muell) di Persemaian BPDAS Citarum-Ciliwung, Rumpin, Jawa Barat

“…Kesehatan tanaman di persemaian merupakan tahap awal dalam menentukan keberhasilan penanaman. Serangan hama dan penyakit menjadi salah satu faktor pembatas yang menentukan keberhasilan penanaman di persemaian ataupun di lapangan (Suharti dan Kuniarty 2013;Hidayati et al 2020). Salah satu tantangan yang ada di persemaian adalah pengendalian hama dan penyakit pada bibit karena umur bibit yang masih muda tergolong rentan terserang hama dan penyakit.…”