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EVALUATION OF SOME PLANT EXTRACTS AGAINST PEST COMPLEX OF CAULIFLOWER (Brassica oleracea var. botrytis L.)

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Title EVALUATION OF SOME PLANT EXTRACTS AGAINST PEST COMPLEX OF CAULIFLOWER (Brassica oleracea var. botrytis L.)
 
Creator VISWANADHA RAO, B
 
Contributor RAMACHANDRA RAO, G
 
Subject EVALUATION, PLANT, EXTRACTS, AGAINST, PEST, COMPLEX, CAULIFLOWER
 
Description A field experiment entitled “Evaluation of some plant extracts against
pest complex of cauliflower (Brassica oleracea var. botrytis L.)” was undertaken
during rabi, 2007-2008 at Agricultural College Farm, Bapatla as well as in the
Department of Entomology.
Under field conditions, eleven treatments viz., 5% leaf extracts of
Clerodendron inerme, Pongamia glabra, Annona squamosa, Parthenium
hysterophorus, Melia azedarach, Lantana camera, Murraya koenigii , Ipomea
cornea, Emblica officinalis, neem seed kernel extract (5%) and control (Untreated
check) were selected and replicated thrice in a randomized block design. The
above treatments were evaluated against Spodoptera litura (Fab.), Plutella
xylostella (Linn.) and Lipaphis erysimi (Kalt) on cauliflower. The first spray was
imposed at 39 days after transplanting when moderate level of infestation of the
pests was observed in the experimental plot and a total of three sprays were given
at fortnightly interval during the crop period.
The evaluation of efficacy of insecticides revealed that NSKE 5% was
found highly effective against S. litura, P. xylostella and L. erysimi. The next best
treatment was M. azedarach leaf extract 5% followed by P. glabra leaf extract 5%
and were found highly effective against S. litura and P. xylostella. In case of
L. erysimi the next best treatment was P. glabra leaf extract 5% followed by
M. azedarach leaf extract 5%. All the remaining treatments viz., 5% leaf extracts
of C. inerme, A. squamosa, P. hysterophorus, L. camera, M. koenigii, I. cornea ,
E. officinalis have showed poor performance against S. litura, P. xylostella and
L. erysimi but were significantly superior over untreated check.
Highest curd yield was recorded with the NSKE 5% followed by P. glabra
leaf extract 5% and M. azedarach leaf extract 5%. The treatments that followed in
the desending order of curd yield were 5% leaf extracts of A. squamosa,
L. camera, C. inerme, P. hysterophorus, I. cornea, E. officinalis and M. koenigii
and were significantly superior over untreated check.
The effect of these treatments (at different concentrations viz., 0.1, 0.5, 1.0,
3.0 and 5.0%) was also tested on the growth and development of third instar
larvae of S. litura in the laboratory.
The repellent and antifeedant property of all the plant extracts viz., 5% leaf
extracts of C. inerme, P. glabra, A. squamosa , P. hysterophorus, M. azedarach,
L. camera, M. koenigii , I. cornea , E. officinalis and neem seed kernel extract
was enhanced with increase in their concentration (0.1 to 5.0%) and maximum
efficacy was observed at 5.0 per cent concentration.
Among the different plant extracts, NSKE was highly inhibitive and
suppressed the growth and development of S. litura followed by M. azedarach
leaf extract and P. glabra leaf extract. Similarly the developmental period
increased and the adult emergence, growth index, survival index, weight of larva
and pupa, larval weight index and pupal weight index decreased as the
concentration of plant extracts increased from 0.1 to 5.0 per cent.
 
Date 2016-08-02T10:58:41Z
2016-08-02T10:58:41Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70478
 
Language en
 
Relation D8385;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD