Diversity of pest and non-pest insects in an organic paddy field cultivated under the System of Rice Intensification (SRI): A case study in Lubok China, Melaka, Malaysia

Author: Norela S., Anizan I., Ismail B. S. * and Maimon A.
Received 10 May 2013, accepted 18 October 2013.
Abstract

Insect diversity studies were conducted in paddy plots planted organically under SRI in Lubok China, Melaka. Eight sampling visits were made starting from the planting of seedlings until flowering stage, milky stage and ripening of the grains. Five sampling methods were used, i.e. light trap, sweeping net, sticky trap, yellow pan trap and pitfall trap. A total of 34 species representing 21 families and 8 orders of insects was recorded comprising Homoptera, Hymenoptera, Coleoptera, Orthoptera, Odonata, Hemiptera, Lepidoptera and Diptera. For the total sampling period, the Shannon-Wiener diversity index (H’) is 1.17, Shannon-Weiner evenness index (E’) is 0.89 and Margalef richness index (R’) is 4.77, respectively. However, no significant differences between the sampling visit (p > 0.05). The most abundant insects order were Orthoptera (22.9%; 231 individuals) the lowest was Diptera (2.3%; 23 individuals). The most abundant species was order Lepidoptera (13.8%) and the lowest was from Hemiptera (5.9%). In terms of feeding habits, herbivorous insects were the most abundant (65%), followed by carnivores (27%) and omnivores (8%). Results indicated that SRI has ensured a good balance between the populations of pests, beneficial insects (predators and parasitoids) as well as other insect’s community during the various phases of paddy development without any appreciable loss in yield. These show that SRI is an effective way to conserve, use and enhance biodiversity crucial to sustainable food security.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263Year: 2013, Vol. 11, Issue 3&4, pages 2861-2865.Publisher: WFL.


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