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Delineation of larval instars in field populations of paddy yellow stem borer, Scirpophaga incertulas (Lepidoptera: Pyralidae).

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Title Delineation of larval instars in field populations of paddy yellow stem borer, Scirpophaga incertulas (Lepidoptera: Pyralidae).
Not Available
 
Creator A.P. Padmakumari, G. Katti, V. Sailaja, Ch. Padmavathi, V. Jhansi Lakshmi, M. Prabhakar and Y.G. Prasad
 
Subject Dyar's rule, mandibular width, rice, yellow stem borer, Scirpophaga incertulas
 
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.
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Date 2023-06-23T07:20:24Z
2023-06-23T07:20:24Z
2013-07
 
Type Research Paper
 
Identifier 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
0474-7615
http://krishi.icar.gov.in/jspui/handle/123456789/78908
 
Language English
 
Relation Not Available;
 
Publisher ARRW,cuttack