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http://krishi.icar.gov.in/jspui/handle/123456789/78908| Title: | Delineation of larval instars in field populations of paddy yellow stem borer, Scirpophaga incertulas (Lepidoptera: Pyralidae). |
| Other Titles: | Not Available |
| Authors: | A.P. Padmakumari, G. Katti, V. Sailaja, Ch. Padmavathi, V. Jhansi Lakshmi, M. Prabhakar and Y.G. Prasad |
| ICAR Data Use Licennce: | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf |
| Author's Affiliated institute: | ICAR::Indian Institute of Rice Research |
| Published/ Complete Date: | 2013-07 |
| Project Code: | NAIP-DSS |
| Keywords: | Dyar's rule, mandibular width, rice, yellow stem borer, Scirpophaga incertulas |
| Publisher: | ARRW,cuttack |
| Citation: | A.P. Padmakumari, G. Katti, V. Sailaja, Ch. Padmavathi, V. Jhansi Lakshmi, M. Prabhakar and Y.G. Prasad .2013. Delineation of larval instars in field populations of paddy yellow stem borer, Scirpophaga incertulas (Lepidoptera: Pyralidae). Oryza . Vol 50.( 3) :259-267 |
| Series/Report no.: | Not Available; |
| Abstract/Description: | Not Available |
| Description: | Delineation of larval instars of an insect is important in morphological and physiological studies. We applied Dyar’s rule to morphometric measurements of larval instars from field populations of the yellow stem borer (YSB), Scirpophaga incertulas (Walk.) collected on two paddy cultivars over three seasons. The conventional head capsule width (HCW) measurement was compared with mandibular width (MW) of larvae from both field and laboratory populations. Frequency distribution of HCW showed seven peaks with size overlaps indicating seven instars in field populations. Distinct size classes were observed in MW with means of 0.042, 0.083, 0.125, 0.166, 0.208, 0.250 and 0.291 mm for 1st, 2nd, 3rd , 4th, 5th, 6th and 7th instars, respectively, in the field population. However, size classes fell into five instars from HCW and MW measurements of larvae reared on cut paddy stems under constant temperature (25 ± 1°C) and humidity (60± 5%) indicating two additional, late larval instars under variable field conditions. For the same instar, mean HCW size slightly varied and was overlapping while mean MW size was identical between field and laboratory populations for each of the first five common larval instars. |
| ISSN: | 0474-7615 |
| Type(s) of content: | Research Paper |
| Sponsors: | Not Available |
| Language: | English |
| Name of Journal: | Oryza |
| Volume No.: | .Vol 50.( 3) : |
| Page Number: | 259-267 |
| Name of the Division/Regional Station: | Entomology section |
| Source, DOI or any other URL: | Not Available |
| URI: | http://krishi.icar.gov.in/jspui/handle/123456789/78908 |
| Appears in Collections: | CS-IIRR-Publication |
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