Intraspecific life cycle and larval instar variations among local populations of Asian corn borer, Ostrinia furnacalis (Guenne) (Lepidoptera: Crambidea) in the Philippines

Issue Date

4-2012

Abstract

Intraspecific life cycle with emphasis on larval instar variations of six local populations of F2 generation of Asian corn borer (ACB), Ostrinia furnacalis (Guenee), was studied. The initial populations were collected from at least four towns of the different regional sites and reared for one generation on artificial diet under room temperature and relative humidity. Results showed that the populations in Laguna and Leyte had the longest life cycle and the shortest were observed on Isabela populations. Significant differences in the larval duration of the different local populations of the ACB were observed with those from Leyte having longest followed by Laguna ACB, while those from Isabela and South Cotabato had the shortest. Most significant of the results was the absence of the sixth instar larval period or the pre-pupal stage for ACB populations in Isabela, Camarines Sur, South Cotabato and Bukidnon. Pupal duration and pupal length significantly differed among the six local populations of ACB. The observed discrepancy was also reported in previous ACB life history studies. The results showed differences in the length of larval period and number of larval instars and this maybe attributed to several factors such as maternal age, quality of the egg, the kind of host or diet as reported by a researcher a few years ago. It is also possible that there may be other populations of Ostrinia in the country. These significant variations in the life cycle, total larval duration and number of larval instars are interesting research areas to pursue in the future. This very basic knowledge will be important in may aspects of ACB control and management.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

26

Issue

1

Page

13-27

Document Type

Article

Frequency

semi-annually

Physical Description

illustrations ; tables; maps

Language

English

En – AGROVOC descriptors

OSTRINIA FURNACALIS; INSECTA; PEST; PEST OF PLANTS; LIFE CYCLE; LARVAL STAGE; PUPAL STAGE; INSTARS; ANIMAL DEVELOPMENT STAGE; PHILIPPINES

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