Abstract
The infestation of bagworm larvae on sago palm (Metroxylon sagu Rottb.) applied with two types of urea fertilizer (50 to 100 kg N ha-1), common and slow-release, in an experimental field (6 rows of 5 plots running east to west: A, B, O, C, D, and E) in Leyte, Philippines, was investigated in 2008 and 2010. The bagworm was identified as Pteroma pendula Joannis and its related species based on the appearance and the venation of the fore and hind wing of the male adult. The sago palms infested by bagworm ranged from 64 to 100 % of all sago palms from the A to the E row in the experimental field in 2008. Application of urea fertilizer, both common and slow-release, resulted in increasing, although not significant, bagworm infestation. The percentage of infested sago leaves of the spiny sago palm to total leaves of the spiny sago palm was 89 %, which was different from those of non-spiny sago palm (83 %) in 2008. In 2010, the infested sago leaves were found in the spiny sago palms only. The spiny sago palms in the E1 plot (located on the western end of row E) had 6 and 5 infested living leaves, which was 38.5 to 40.0 % of all living leaves of the sago palms. A mono-culture plantation, with limited plant species, has the same kind of pest problem and requires risk management because of the scarcity of natural enemies and the outbreak of bagworm.
https://ror.org/00b45dj41 
