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BIONOMICS AND MANAGEMENT OF ROSE THRIPS, Scirtothrips dorsalis Hood

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Title BIONOMICS AND MANAGEMENT OF ROSE THRIPS, Scirtothrips dorsalis Hood
 
Creator PATEL, NARESHKUMAR M.
 
Contributor ROTE, N.B.
 
Subject roses, developmental stages, animal developmental stages, eggs, sexual reproduction, chillies, relative humidity, insecticides, land resources, yields
 
Description Studies on, Bionomics and management of rose thrips, S. dorsalis
were carried out at N. M. College of Agriculture, N.A.U., Navsari during 2002
and 2003.
The study on bionomics showed that S. dorsalis completed its total life
cycle on rose leaves varied from 17 to 21 (Av. 18.60 ± 1.26) days in case of
male and 16 to 21 (Av. 19.30 ± 1.64) days in case of female during August-
September 2002. The total life cycle period during January-February 2003
varied from 20 to 23 (Av. 21.20 ± 1.03) days in case of male and 21 to 25 (Av.
22.60 ± 1.35) days in case of female. The average hatching percentages were
91.03 and 84.80 during August-September 2002 and January-February 2003,
respectively. The incubation period was 4 to 7 (Av. 5.26 ± 0.91) days and 4 to
8 (Av. 6.36 ± 0.10) days in the months of August 2002 and January 2003,
respectively.
The first instar duration was found to be 2 to 3 (Av. 2.54 ± 0.50) days
and 3 to 4 (Av. 3.74 ± 0.44) days during August 2002 and January 2003,
respectively. The second instar duration varied from 3 to 4 (Av. 3.50 ± 0.50)
days and 3 to 4 (Av. 3.89 ± 0.31) days during August 2002 and January 2003,
respectively. The total larval period was found to be 5 to 7 (Av. 6.04 ± 0.69)
days and 7 to 8 (Av. 7.63 ± 0.48) days during August 2002 and January 2003,
respectively.
The pre-pupal period varied from 1 to 2 (Av. 1.57 ± 0.49) days and 1 to
2 (Av. 1.91 ± 0.28) days during August-September 2002 and January-
February 2003, respectively. The pupal period varied from 2 to 3 (Av. 2.52 ±
0.50) days and 2 to 4 (Av. 3.51 ± 0.78) days during August-September 2002
and January-February 2003, respectively.
The developmental period of S. dorsalis was found to be 12 to 18 (Av.
15.50 ± 1.53) days and 18 to 21 (19.53 ± 0.72) days during August-
September 2002 and January-February 2003, respectively.
The sex ratio (female:male) of S. dorsalis was 1.67:1.00 and 2.42:1.00
during 2002 and 3.09 : 1.00 and 3.74 : 1.00 during 2003 in the laboratory
and field conditions, respectively.
The pre-oviposition period varied from 1 to 2 (Av. 1.30 ± 0.48) days
during 2002 and 2003, while oviposition period of S. dorsalis varied from 1
to 3 (Av. 2.10 ± 0.87) days and 1 to 5 (Av. 2.00 ± 1.25) days during 2002 and
2003, respectively. Post oviposition period was 0 to 1 (Av. 0.20 ± 0.42) days
and 0 to 1 (Av. 0.10 ± 0.32) days during 2002 and 2003, respectively. The egg
laying capacity (fecundity) of female S. dorsalis varied from 1 to 13 (Av. 6.40
± 3.92) eggs and 2 to 15 (Av. 8.10 ± 3.60) eggs during 2002 and 2003,
respectively. The longevity of male varied from 1 to 3 days (Av. 1.90 ± 0.74)
days and 1 to 3 (Av. 1.80 ± 0.63) days during 2002 and 2003, respectively,
while in case of female it was 2 to 5 (Av. 3.60 ± 1.07) days and 2 to 6 (3.40 ±
1.07) days during 2002 and 2003, respectively.
The correlation studies on the basis of pooled data of years 2002 and
2003 revealed that there was significant negative correlation of thrips
population with minimum temperature, morning relative humidity, evening
relative humidity, mean relative humidity, rainfall, rainy days and wind
speed. While, thrips had significant positive correlation with sunshine hours
and maximum temperature.
Regarding the bioefficacy study, the effective treatments for thrips
imidacloprid @ 20 g a.i./ha, acetamiprid @ 10 g a.i./ha and Carbosulfan @
500 g a.i./ha.
Among the various varieties of rose, the thrips population per leaf was
found to be non significant during both the years.
A general survey for S. dorsalis on rose fields during 2002 and 2003
showed that S. dorsalis remained active throughout the year except in rainy
days.
 
Date 2016-03-04T13:15:00Z
2016-03-04T13:15:00Z
2006-01
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64775
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari