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GROWTH AND DEVELOPMENT OF BIHAR HAIRY CATERPILLAR, Spilosoma obliqua (Wlk.) ON CASTOR UNDER ELEVATED CARBON DIOXIDE CONDITIONS

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Title GROWTH AND DEVELOPMENT OF BIHAR HAIRY CATERPILLAR, Spilosoma obliqua (Wlk.) ON CASTOR UNDER ELEVATED CARBON DIOXIDE CONDITIONS
 
Creator TEJUSING
 
Contributor DHARMA REDDY, K
 
Subject weeds, costs, land resources, rice, biological phenomena, planting, manpower, tillage equipment, field capacity, grain
Spilosoma obliqua (Wlk.), CARBON DIOXIDE
 
Description Laboratory experiments on growth and development of Bihar hairy caterpillar
Spilosoma obliqua on Castor under elevated CO2 conditions were under taken during
September 2010 – February 2011. The host plant Castor was grown inside the Open Top
Chambers (OTCs) at three levels of CO2 concentration (550 ppm, 700 ppm and ambient
condition) to obtain the feed for laboratory culture of S. obliqua. The experimental results
showed that S. obliqua consumed significantly higher quantity of Castor foliage under
elevated CO2 condition as compared to ambient condition. The final larval weight, leaf
weight consumed and faecal matter weight were observed more significant among all the
treatments and the larval duration was increased to one day in the elevated CO2 condition
than the ambient condition. There was significant difference in the pupal weight recorded
and it was more in the ambient condition as compared to the elevated CO2 condition. There
were no significant differences in other parameters like, pupal duration and adult longevity.
The multiple generation studies (four) were conducted to know the effect of
elevated CO2 on S. obliqua on Castor crop. Feeding trials were continued with castor leaves
by maintaining the corresponding CO2 conditions. Significant differences were observed in
growth and development of S. obliqua when fed on elevated CO2 foliage across
generations. The consumption of foliage was found to be higher under elevated CO2
conditions (3.652g in 550 ppm and 3.671g in 700 ppm) than ambient CO2 condition
(3.309g). Similarly the consumption pattern significantly varied across generations starting
from first (3.089g) to fourth (3.945g) generation. This was more evident in the third
(3.956g) and fourth (3.945g) generations than the first (3.089g) and second (3.187g)
generations. The mean larval weight was found to be higher under elevated CO2 condition
(0.864g in 550 ppm and 0.864g in 700 ppm) than the ambient CO2 condition (0.772g).
Similarly, the mean larval weight significantly varied across generations starting from first
(0.788g) to fourth (0.869g) generations. This was more evident in the third (0.856g) and
fourth (0.869g) generations than the first (0.788g) and second (0.795g) generations. The
mean faecal matter weight was found to be higher under elevated CO2 condition (1.032g in
550 ppm and 1.099g in 700 ppm) than the ambient CO2 condition (0.964g). Similarly, the
mean faecal matter weight significantly varied across generations starting from first
(0.853g) to fourth (1.155g) generations. This was more evident in the third (1.207g) and
fourth (1.155g) generations than the first (0.853g) and second (0.91g) generations.
The consumption of foliage, larval weight and faecal matter were significantly
higher in all the four generations under elevated CO2 condition as compare to the ambient
condition. The larval duration showed significant differences in the four generations. In the
first generation larvae fed with elevated CO2 foliage developed slower and took 21 days in
550 ppm, 700 ppm and 20.2 days in ambient (350 ppm) condition. The result showed that
an increase of nearly one day of larval duration was observed with elevated CO2
conditions. Duration of larvae was increased in second generation when reared on elevated
CO2 foliage and took 22 days in 550 ppm and 22.2 days in 700 ppm and 21 days in ambient
(350 ppm) condition. Where as in the third and fourth generation larvae took 23 days in
550 ppm, 700 ppm and 21 days in ambient condition. There was no difference in larval
duration of third and fourth generation. Result showed that an increase of one day of larval
duration in second generation and two days in the third and fourth generation was observed
with elevated CO2 conditions.
 
Date 2016-06-07T14:23:32Z
2016-06-07T14:23:32Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66953
 
Language en
 
Relation D8850;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY