Leaf folder and stem borer are pest moths (Lepidoptera) of paddy crop and caused serious damage and significant rice yield loss. The richness, abundance, and diversity of the pest moths were calculated in one paddy planting season and sampled from a model conventional paddy field, located on the west coast of Peninsular Malaysia (Sabak Bernam, Selangor). The adult and immature stages of moths associated with paddy plants have been sampled using active sampling namely sweep net and stem cross-cutting. A total of 189 individuals belonging to five species under two families (Crambidae and Noctuidae) were recorded. Overall, the richness (R’), diversity (H’), and evenness (E’) index of lepidopteran species were 0.76, 1.51, and 0.90, respectively. The richness and species abundance throughout the paddy stages were discussed. The DNA barcode of five collected species using cytochrome oxidase subunit 1 (CO1) viz. Cnaphalocrocis medinalis (Guenée) (leaf folder), Scirpophaga incertulas (Walker), Chilo auricilius Dudgeon, Sesamia inferens (Walker), and Parapoynx stagnalis (Zeller) (stem borers) were presented. This study’s outcomes are very important as the initial stage for conservation purposes, especially in managing the strategy in handling the pest species populations in the paddy field.
Hemipterans are the diverse, abundant, and important pests in the paddy ecosystem due to their piercing and sucking mouthparts that feed on the crop causing significant losses in rice yields. Despite their important roles in the paddy ecosystem, the information on DNA barcode, diversity, and species richness has been occasionally discussed. This study aimed to measure its abundance, species richness, and barcode hemipteran species from the paddy ecosystem. Active sampling was used with two different sampling arrangements in the paddy ecosystem in Sabak Bernam, Selangor, for two different seasons. Hemipterans were collected and identified up to species level morphologically prior to DNA barcoding. The richness and the abundance of species were measured along with the paddy growth phases (vegetative, reproductive, and mature). A total of 2,167 individuals of seven hemipteran species (Cyrtorhinus lividipennis, Leptocorisa oratorius, Nephotettix virescens, Cofana spectra, Sogatella furcifera, Scotinophara coarctata, and Graptostethus sp.) were successfully collected with Shannon-Diversity Index (H’ = 0.4572), Margalef richness index (D = 0.7811), and Evenness Index (E = 0.2257). There was no significant difference (p > 0.05) for species diversity in both seasons. The highest abundance of hemipteran was during the maturity stage (1,543 individuals), followed by the reproductive (591 individuals) and vegetative stages (33 individuals). This study observed a significant difference between the paddy growth for both seasons (p < 0.05). Five hemipteran species namely C. lividipennis, L. oratorius, N. virescens, C. spectra, and S. furcifera, were successfully barcoded with Leptocorisa, the dominant genus. Outcomes from this study suggested that different hemipteran management approaches must be developed to cater to different hemipteran species at different paddy growth stages for a successful and sustainable paddy growing practice in Malaysia.
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