PENGARUH PELABURAN TER TERHADAP PEMBENTUKAN SEL-SEL PENYUSUN KAYU SENGON YANG MENUNJUKKAN GEJALA KARAT TUMOR

Sengon (Falcataria moluccana) is the one of tree that choosen in developing community forest, nevertheless sengon plantation threatened by gall rust (karat tumor) disease epidemic caused by fungi Uromycladium tepperianum. In mature sengon, gall rust symptom characterized by tumor formation on the sengon trunk which can cause inhibition of plant growth and susceptibility to breakage. One of method that can be used to control gall rust is through removing tumor as well as covering tar material on the sengon trunk. In previous study, covering tar regularly was able to inhibit tumor reformation on the sengon trunk. This study aimed to investigate the effect of covering tar treatment and frequency of this treatment on tumor reformation and wood cell constituent formation. This study was carried out through removing tumor on the sengon trunk. Next step was conducting three kinds of treatment consist of tar covering once (TA), tar covering every 15 days (TB) and without covering tar (TC). Parameters that must be observed was the tumor formation as well as the modification of the wood anatomical properties included structure, morphology and proportion of wood constituent cells. The result showed that covering tar treatment effected on the tumor reformation. Frequency of covering tar was conducted regularly (TB) can inhibited tumor reformation effectively compared to tar covering once (TB) and covering tar (TC). Significant changes of wood anatomical properties occurred on tar covering once (TA) which included fiber cells diameter, lumen fiber cells diameter and ray cells width. Effect of gall rust on wood can been observed through fungal mycelia in fiber cells, formation of multiseriate rays, phenolic deposit in ray cells, modification of longitudinal parenchyma cells arrangement and narrower vessel elements diameter. The presence of crystals in fiber cell showed that gal