instar

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in·star

(in'stahr),
Any of the successive nymphal stages in the metamorphosis of hemimetabolous insects (simple or incomplete metamorphosis), or the stages of larval change by successive molts that characterize the holometabolous insects (complex or complete metamorphosis).
[L. form]
Farlex Partner Medical Dictionary © Farlex 2012

instar

(ĭn′stär′)
n.
A stage of an insect or other arthropod between one molt and the next.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

in·star

(in'stahr)
Any of the successive nymphal or larval stages in the metamorphosis of insects.
[L. form]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

instar

a larval stage of insect development. The first instar hatches from the egg and after the first moult (see ECDYSIS becomes the second instar. Thus a third instar larva is one which has completed two moults.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
As in case of 5% solution, the time span of 1st, 2nd, 3rd, 4th, 5th, and 6th instar increased a little than the time taken by the larva fed on the leaves treated with 2% neem solution.
Duration of the second instar was shorter than in the other ones, and Sa was the longest (Table 1).
Their eggs were removed daily and kept in Petri dishes (diameter = 8.5 cm) with the bottoms covered with filter paper moistened with distilled water, until they reached the second instar. The nymphs were then transferred to breeding cages (17.7 x 26.2 x 14.7 cm) because they begin to predate in this stage.
In this study, the duration of instars 2-5 was considerably shorter than reported by Matthiesen (1971) (148 days, n = 5; 281 days, n = 4; 362 days, n = 2 and 520 days, n= 1) for the same species.
Approaching any saltbush elicited an explosive, popcorn-like spectacle as adults and various instars reacted to shadows or movement, launching toward cover in the center of the bush, a behavior reported by Wallace (1955) and Barnum (1964).
The [LT.sub.50] values of the four compounds tested after 24 h on 2nd instar larvae were 9.2, 6.4, 1.1 and 1.8 day for Dursban, SpinTor, Ecotech Bio, and Neemix, respectively (Table 1).
In the summer nymphs of Santa Fe, 31.25% of individuals were males and 68.75% females; males had five instars, while females went through five or six instars (54.54% and 45.45%, respectively).
Instar's duration was between two and four days for immature larvae and six or seven days for last instar larvae (Table 1).
The material studied included 48 first instar larvae and 127 second instar larvae.
However, there were some inconsistencies in the application of descriptive information attributed to the first instar of R.
Recorded data analysis showed that larval weight of silkworm in 1st, 2nd and 3rd days of 5th instar did not increased in two groups significantly while it increased in 7th day of last instar significantly in silkworm larvae fed on Kokosa variety (P<0.05).