Therefore, it was suggested that besides on highly virulent, the selection of OrNV for field release should also based on high reduction rate on food consumption by the infected insects on plant hosts. The highest feeding reduction rate was on neonates treated by type A (-0.074x) followed by neonates treated by type C (-0.053x) and type B (-0.035x). At this period, the food consumption by all tested OrNV was rapidly reduced and maintained low until the experiment ended at 60 DAT. The feeding of inoculated neonates with OrNV reduced rapidly, especially at the early stage of the experiment between eight days after treatment (DAT) to 16 DAT. The impact of OrNV infection on food consumption by the neonates was studied. Based on the results for both inoculation methods, the OrNV type C prepared from cell culture DSIR-HA-1179 was found more effective in controlling the 元 larvae than the other types of OrNV. Low infectivity was mainly due to inactivation of virus inocula in the larval food substrates. In the substrate contamination inoculation test technique, results showed that the level of infectivity was even lower in all OrNV treatments, ranging as low as 6.7% to only 15.0%. No differences in infectivity were observed on other treatments, which ranged from 13.1% to 41.7%. On larvae, the peroral inoculation test technique indicated that the highest mortality of 100% was achieved using type A produced from cell culture DSIR-HA-1179, while the highest infectivity of 41.7% was recorded for type A prepared from infected guts. The infectivity of three Malaysian indigenous types of OrNV types A, B and C were tested on larvae and neonates. The Oryctes nudivirus (OrNV) is a classical biocontrol agent for a major oil palm insect pest the rhinoceros beetle, Oryctes rhinoceros. rhinoceros in the dead wood of the palm, Borassus flabellifer L. In addition, the Red Palm Weevil, Rhynchophorus ferrugineus (Oliver, 1790) (Curculionidae) is newly recorded as an associate of O. Peltophorum pterocarpum (DC.) Heyne (Fabaceae) is a new larval host plant for the beetle. monitoring of coconuts and other palms which have been planted in the park and removal of adult beetles etc) should be undertaken in case of any outbreak of the species in the park. The presence of the beetle in the Lat Krabang Park may indicate that mitigation control measures (e.g. Abstract: Observations on the biology and records of two larval host plants (one of which is new) for the tropical scarab beetle Oryctes rhinoceros (L., 1758) (Coleoptera: Scarabaeidae) in Lat Krabang Park, Bangkok, Thailand during October 2016 are provided therein. The Coconut Rhinoceros Beetle, Oryctes rhinoceros (L., 1758) (Coleoptera: Scarabaeidae: Dynastinae) in Lat Krabang Park, Bangkok, Thailand with notes on its biology and a new larval host plant.
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