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Studies on Biological Control, Host Plant Resistance and Genetic Diversity of Educalyptus Gall Wasp, Leptocybe invasa Fisher and La Salle (Hymenoptera :

KrishiKosh

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Title Studies on Biological Control, Host Plant Resistance and Genetic Diversity of Educalyptus Gall Wasp, Leptocybe invasa Fisher and La Salle (Hymenoptera :
 
Creator Ramanagouda S.
 
Contributor A.S. Vastrad
 
Subject Agricultural Entomology
 
Description Investigations on status of gall wasp and its native parasitoids, utilization of
native parasitoids to manage gall wasp, exploring the primary host of Megastigmus
dharwadicus Narendran & Vastrad, biochemical parameters of different genotypes
and molecular genetic diversity of gall wasp and its native parasitoids were carried
out in the Department of Agricultural Entomology and Department of Agricultural
Biotechnology, College of Agriculture, UAS, Dharwad during 2010-12.
Quarterly fixed plot survey conducted in 18 locations of 7 districts revealed
the decrease in gall incidence from I quarter to III quarter while it was absent during
fourth quarter. Native parasitoids viz., Megastigmus dharwadicus Narendran &
Vastrad was recorded from all the locations surveyed while Aprostocetus gala Walker
from three locations. Roving survey conducted in four states revealed the severe
incidence of Eucalyptus gall wasp in Andhra Pradesh, Orissa and Uttarakhand while it
was not noticed in Karnataka towards the end of 2011. Activity of native parasitoids
was high in Andhra Pradesh (80.00%) and Orissa (81.53%) while no parasitoid
activity was recorded from Uttarakhand. Augmentative releases of native parasitoids
resulted in drastic reduction in gall incidence within 9 months. No fresh gall incidence
was noticed one year after last release. Among the native parasitoids M. dharwadcius
was the most dominant (90.00%) followed by A. gala (10%). Search for the local host
of M. dharwadicus resulted in identification of 33 parasitoids from 13 plant galls
screened, of which 15 were new records from India. The identity of local host of the
native parasitoid, M. dharwadicus remains unresolved. Total phenol was inversely
related to the gall incidence which increased with age of the plant. Molecular diversity
studies revealed low genetic diversity among different L. invasa populations indicated
the possibility of a single introduction and revealed the existence of a different
Megastigmus sp. in Odisha.
 
Date 2016-07-25T13:45:55Z
2016-07-25T13:45:55Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69769
 
Format application/pdf
 
Publisher UAS Dharwad