MORPHOLOGICAL AND MERISTIC STUDY ON RICE BUGS Leptocorisa oratorius (Fabricius, 1764) AT KUALA PILAH AND BAHAU PADDY FIELDS
Keywords:
Paddy rice field, Leptocorisa oratorius, morphology, meristical, pestsAbstract
One of the major pests found in paddy field is the rice bug, Leptocorisa oratorius that feeds on the panicle
of the rice. Leptocorisae species are typically found in paddy fields and lowland grass areas according to
their adaptations. This rice bug is the major sap sucking pest of paddy and causes serious problems in the
cultivation of the crop. Thus, this study urged to identify the species of specimens collected in the paddy
fields of Kuala Pilah and Bahau through morphological and meristic characteristics using key pictorial
evidence of Leptocorisa oratorius. There were seven morphometric characteristics measurements obtained
and four meristic characteristics observed using a dissecting microscope. A total of 308 samples of
Leptocorisa oratorius (Hemiptera: Alydidae) collected from two different areas in selected paddy fields of
Kuala Pilah known as Kampung Kuala Serdang and Kampung Lonek. All the morphometric characters
were significantly different (P<0.05) except for the antenna (p= 0.346) and hindlegs (p= 0.117). Moreover,
the spots on the abdomen at ventral-lateral, and behind the compound eye are unique and could not be seen
in any other Leptocorisae sp. Subsequently, the identification was supported by constructing key pictorial
which later recognized these specimens as L. oratorius. The standard error of all morphometric
characteristics revealed small values and slight differences in the body length and the wings between these
two populations. The high abundance of L. oratorius found in milking stage of paddy compared to soft
dough stage will jeopardize the paddy yield. Believably, this study can help to create awareness to the
farmers and researchers to find solutions to defend the paddy crop against pests.
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