Eur. J. Entomol. 115: 364-371, 2018 | DOI: 10.14411/eje.2018.036

Flora surrounding rice fields as a source of alternative prey for coccinellids feeding on the pests of riceOriginal article

Chitra SHANKER1, Lydia CHINTAGUNTA1, Sampathkumar MUTHUSAMY2, Sunil VAILLA1, Amudhan SRINIVASAN1, Gururaj KATTI1
1 ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad 500030, Telangana, India; e-mails: chitrashanker@gmail.com, lclydiach@gmail.com, vsunil85@gmail.com, srinidrr@gmail.com, gururajkatti@yahoo.com
2 ICAR - National Bureau of Agricultural Insect Resources, Bengaluru 560024, Karnataka, India; e-mail: ento_sam@yahoo.co.in

Coccinellids are effective predators and a key component of the predator guild in rice ecosystems. In order to enhance their efficacy, a study was undertaken to assess the seasonal movement of coccinellids into rice fields and the role of the surrounding flora on their colonization. The seasonal abundance of coccinellids and their prey was recorded on the rice crop and the surrounding flora at fortnightly intervals from 2012 to 2015. Coccinellid prey range was assessed using PAGE electrophoresis. The herbivorous insects associated with weeds were Aphis gossypii Glover, Aphis craccivora (Koch), Cicadulina bipunctata (Melichar), Schizaphis graminum (Rondani), Sitobion sp., Thaia oryzivora Ghauri and Zygina maculifrons Matsumura. Of the species of coccinellids recorded in rice fields, Harmonia octomaculata (Fabricius), Micraspis discolor (F.), Propylea dissecta (Mulsant), Coccinella transversalis Fabricius, Cheilomenes sexmaculata (Fabricius), Scymnus nubilus Mulsant and Brumoides suturalis (Fabricius) were also recorded on weeds. The esterase profiles indicated that the leafhoppers and aphids on the weeds were the prey of the coccinellids before they colonized the rice fields. The coccinellids recorded on the weeds showed bands corresponding to the insects present on the weeds. Beetles collected from rice fields had different bands, some of which corresponded to the green leafhopper (GLH) Nephotettix virescens Distant, the brown planthopper (BPH) Nilaparvata lugens Stal and white backed planthopper (WBPH) Sogatella furcifera Hovarth infesting rice. In addition, some bands corresponded to hoppers and aphids that were present on the surrounding flora. The results indicate the importance of surrounding flora in the conservation and colonization of rice fields by coccinellids.

Keywords: Coleoptera, Coccinellidae, conservation, biological control, generalist predators, gut-content analysis, prey spectrum, planthoppers, aphids, rice

Received: July 19, 2017; Revised: February 22, 2018; Accepted: February 22, 2018; Published online: July 31, 2018  Show citation

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SHANKER, C., CHINTAGUNTA, L., MUTHUSAMY, S., VAILLA, S., SRINIVASAN, A., & KATTI, G. (2018). Flora surrounding rice fields as a source of alternative prey for coccinellids feeding on the pests of rice. EJE115, Article 364-371. https://doi.org/10.14411/eje.2018.036
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