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EVALUATION OF Amphiareus constrictus (Stal.) AN ANTHOCORID PREDATOR, FOR THE BIOCONTROL OF BROWN PLANTHOPPER, Nilaparvata lugens (Stal.) ON RICE

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Title EVALUATION OF Amphiareus constrictus (Stal.) AN ANTHOCORID PREDATOR, FOR THE BIOCONTROL OF BROWN PLANTHOPPER, Nilaparvata lugens (Stal.) ON RICE
 
Creator Lavanya, Bhovare
 
Contributor Rana, D.K.
Shanker, Chitra
Dubey, V.K.
Shrivastava, G.K.
Saxena, R.R.
 
Subject Amphiareus constrictus (Stal.),ANTHOCORID PREDATOR,BROWN PLANTHOPPER, ilaparvata lugens (Stal.),RICE
Agricultural Entomology
 
Description Predatory efficiency studies on BPH and Corcyra eggs was studied where BPH eggs
consumed per day per predator by all instars ranged from 0.4 ± 0.01 to 3.10 ± 0.10 eggs and
Corcyra eggs consumed across all instars ranged from 0.4 ± 0.01 to 7.7 ± 0.1 eggs. The total
number of prey required for complete development on BPH and Corcyra eggs was 34.8 ± 2.3
and 66.2 ± 5.8 eggs respectively. There was a reduction in feeding of BPH eggs from fifth
instar indicating lesser preference for pre adults and adult stage.
The predator-prey interaction was assessed by no-choice tests and choice tests. Under no
choice test, the results revealed are the percentage of prey offered that was highest for BPH
eggs (48.00%) followed by WBPH eggs (40.00%) and the least was for GLH (20%) eggs
indicating a greater preference for BPH eggs. The approaching time (64 ± 9.3 min) was
lowest and the handling time was the highest (25 ± 3.12 min) for BPH eggs where A.
constrictus took long time to feed on BPH eggs.
The studies on prey preference evaluated by multiple choice test revealed that after 2
hrs, A. constrictus significantly preferred BPH eggs (73.33 % ) followed by WBPH eggs
(26.67%) and no preference for GLH eggs. After 24 hrs, the predator maintained its high
preference for BPH eggs (49.88%) followed by WBPH eggs (33.33%) and least preference
for GLH eggs (16.67%). Approach time was least for BPH eggs (38 min) and higher for
WBPH (60 min).
The stage preference of A. constrictus on different stages of BPH indicated its high
preference for egg stage (73.53%) of BPH followed by I instar nymphs (26.47 %) and no
preference for rest of the stages. The type II curvilinear positive functional response exhibited
by fourth and fifth instar of A. constrictus to BPH eggs suggests its potentiality of utility as
biocontrol agent against brown planthopper.
The cage studies of A. constrictus on varying levels of BPH population on 30 day old TN-
1 plant revealed that mortality per cent was significantly higher in cages with predator release
in comparison to no predator release.
Present studies clearly indicate that A. constrictus could be considered as a biocontrol
agent against the brown planthopper eggs especially at voracious feeding stages i.e., fourth
and fifth instars.
 
Date 2016-12-15T12:11:36Z
2016-12-15T12:11:36Z
2016
 
Type Thesis
 
Identifier 103 p.
http://krishikosh.egranth.ac.in/handle/1/90289
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur