DSpace
 

Open Access E-Repository @ Indian Institute of Horticultural Research >
Theses and Dissertations >
DIVISION OF ENTOMOLOGY & NEMATOLOGY >

Please use this identifier to cite or link to this item: http://www.erepo.iihr.ernet.in/handle/123456789/499

Title: Aphid (Aphididae: homoptera) vectors of papaya ringspot virus (prsv) disease and their management
Authors: C M, Kalleshwara Swamy
Guide/Chairperson: Abraham Verghese
N K, KrishnaKumar
Keywords: Aphid
vectors
papaya
ringspot
prsv
virus
disease
management
Issue Date: 2006
Year of Submission: 2006
Abstract: A. gossypii, A. craccivora and M. persicae are the dominant aphid species in yellow funnel traps. Among these, A. gossypii was observed to be the pre-dominant species in terms of number in yellow funnel trap catches compared to A. craccivora and M. persicae. A number of A. gossypii trapped in yellow funnel trap was higher between March and April and from December to Second fortnight of February. Fresh PRSV infection was higher in April-May. Fresh incidence of PRSV (%) coincided with alates caught in yellow funnel traps in the fourth previous week suggesting the strong relationship between aphid number and PRSV incidence. Multiple regression models point to total number of alates caught in traps, maximum and minimum temperature in influencing the PRSV incidence. The model developed for 2004-5, when validated for 2005-6 explained 80%(R2=0.80) variation by a combination of three factors (total of three species of aphid vectors, maximum temperature and minimum temperature) which indicates the strength of the model developed. The cropping pattern also has bearing on higher trap catches. In south Karnataka, cultivation of cucurbits has an influence on PRSV epidemiology. Alate production of A. gossypii is dependent on the density of apterous forms and age of the plant. A gossypii a dominant vector in terms of number is also an efficient vector and can inoculate PRSV to a number of plants (at least four) once acquired the PRSV. Leaf – disc assay is the first of its kind to use for PRSV vector efficiency of aphids and opens a window of opportunity for studying virus-vector relationship. Time of infection was observed to influence total yield. Avoiding early PRSV infection was crucial to enhance yield. The plants which were infected prior to flowering (9 months after planting) yielded very less fruits compared to plants infected later.
URI: http://www.erepo.iihr.ernet.in/handle/123456789/499
University in which they received their degree: University of Agricultural Sciences, Bangalore
Degree Level: Ph.D
Appears in Collections:DIVISION OF ENTOMOLOGY & NEMATOLOGY

Files in This Item:

File Description SizeFormat
IIHR Abstracts PG Education_Pages 212.pdf163.62 kBAdobe PDFView/Open
View Statistics

Items in E-Repository@IIHR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! || Powered by DSpace ||  Feedback E-Repo Administrators: R Venugopalan & S Thippeswamy