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|Title: ||Host plant resistance to thrips in chrysanthemum: Appraisal of germplasm evaluation|
|Authors: ||P, Venkata Rami Reddy|
|Issue Date: ||2010|
|Citation: ||P. Venkata Rami Reddy And T. Janakiram. 2010. Host plant resistance to thrips in chrysanthemum: Appraisal of germplasm evaluation.IX European Congress of Entomology, Budapest, Hungary, August 22-27.|
|Abstract: ||Chrysanthemum (Dendranthema grandiflora Tz.,) is one of the commercially viable flower crops of India and is popular among small and medium farmers. Thrips (Microcephalothrips abdominalis) are the most serious and economically important pests of chrysanthemum. Nymphs and adults lacerate the tissues of flower buds and flowers and suck the sap causing scorching marks and deformation. Severe incidence of thrips adversely affects the marketable flower yield thus making the frequent use of insecticides inevitable. In order to minimize the insecticide usage, a sustainable and ecologically viable pest management strategy like host plant resistance is very much needed. In our study, 80 germplasm collections of chrysanthemum were evaluated for resistance to thrips, at Indian Institute of Horticultural Research, Bangalore, India during 2006-09 and found significant variations among accessions in their susceptibility to thrips. We identified a few genotypes viz., Swetha Sringar, Varthur, Lemon, Co-2, Mother Teresa and Kargil which were least susceptible and could be further explored as resistance sources. Significant variations were also observed among three colour groups of flowers in attracting thrips viz.,. yellow, red and white. Varieties of yellow coloured flowers attracted highest number of thrips (12.24/flower) followed by red (5.12) and white (6.82) which were on par with each other. Comparative assessment of variability among indigenous and exotic collections revealed that the indigenous collections were more promising as resistance sources than exotic accessions indicating the priority the native germplasm deserves in screening for resistance. In the light of these findings, nature and scope of host plant resistance against thrips in relation to flower colour and origin of chrysanthemum accessions are discussed.|
|Appears in Collections:||Plant Genetic Resources|
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