A preliminary survey of arthropods in organic and inorganic paddy fields in Cheranmahadevi Taluk, Tamil Nadu, India
Keywords:
insects diversity, organic farming, beneficial insects, harmful insectsAbstract
India has a primarily agrarian economy. Agriculture contributes around 16-17% to the overall Gross Domestic Product (GDP) of the country. In this study, conducted in rice fields at Pappakudi (8°45'44"N, and 77°30'59"E) and Odaikarai-Thulukapatti (8°46'52"N, and 77°31'01"E) Cheranmahadevi Taluk, Tirunelveli District in Tamil Nadu, India, arthropods were collected from the study area and classified. This collection was done using the roving survey method, and relative abundance percentage composition was analysed. The order Hymenoptera emerged as the most diverse group of beneficial insects in both organic and inorganic fields, notably ants and honey bees. Order Orthoptera, including grasshoppers, had the highest count of 27.7%. The Chrysomelid beetle was completely absent in the organic fields. The ant family Formicidae and the butterfly family Lycaenidae were not found in the inorganic fields. Both agricultural practices exhibited low counts of families and genera in the orders Lepidoptera (butterflies and moths) and Araneae (spiders). This study shows diverse arthropods damaging or benefiting paddy on organic and inorganic farms. Compositional analysis revealed differences in the presence and abundance of certain insect families among these two farming practices.
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