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Distribution pattern and sequential sampling plan for chilli thrips, Scirtothrips dorsalis Hood (Thripidae: Thysanoptera)

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Title Distribution pattern and sequential sampling plan for chilli thrips, Scirtothrips dorsalis Hood (Thripidae: Thysanoptera)
Not Available
 
Creator N.R. Prasannakumar
B.S. Rajendra Prasad
P. Shivarama Bhat
 
Subject Thrips . Scirtothrips dorsalis . Sampling . Sample size . Taylor’s power law
 
Description Not Available
Spatial distribution and sequential sampling plan for chilli thrips, Scirtothrips dorsalis Hood were analyzed through Taylor’s
power law (TPL) and Iwao’s mean crowding regression (IMC) for rainy and summer seasons during 2016–17 on chilli crop. The
results revealed that the mean number of thrips in the field was low (1.07 thrips/plant) at early crop growth stages (32 days after
transplanting (DAT)) and increased gradually with a peak (21.53 thrips/plant) at 56 DAT. Inconsistency in the mean number of
thrips with shifting variance was noticed. The variance of thrips population increased with increase in its density with the best
variance (122.41) observed at 56DAT. Samples of thrips showed variance tomean ratio (S2/X), Lloyd’s patchiness index (X*/X),
as well as Morisita Index more than one, revealing clumped distribution. The data on thrips population was best fit to TPL (a =
0.184, b = 1.27, R2 = 0.66) and the IMC (α = 0.93, β = 1.14, R2 = 0.94). Larger variability in sample size vis-a-vis mean population
density was also achieved at 10 and 20% precision levels. Considering TPL parameters, the decisive lines of sequential
sampling for S. dorsalis was chosen at d = 13n ± 8.07√n. The sequential sampling plan will thus help in reducing the costs for an
effective and efficient management of S. dorsalis on chilli
ICAR
 
Date 2021-07-19T07:35:00Z
2021-07-19T07:35:00Z
2019-10-01
 
Type Journal
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/48705
 
Language English
 
Relation Not Available;
 
Publisher Springer