POPULATION DENSITY AS A CRITERION FOR EVALUATING VARIETAL RESISTANCE OF CASTOR (Ricinus communis LINN.) TO JASSID INFESTATION

M. STEPHEN DORAIRAJ; V. SAVITHRI and S. G. AIYADURAI

doi:https://doi.org/10.29321/MAJ.10.A03924

Madras Agricultural Journal

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POPULATION DENSITY AS A CRITERION FOR EVALUATING VARIETAL RESISTANCE OF CASTOR (Ricinus communis LINN.) TO JASSID INFESTATION

Author: M. STEPHEN DORAIRAJ, V. SAVITHRI and S. G. AIYADURAI,

p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 50, Issue: feb-feb,

DOI:https://doi.org/10.29321/MAJ.10.A03924

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Abstract

Investigations were taken up to assess the degree of relationship of the jassid population with the varied types of waxy bloom coatings and stem colours of castor. Jassid population counts were recorded on a total of seventy- six varieties of castor maintained at the Agricultural Research Institute, Coimbatore during 1961-62 monsoon season.

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