Variability in Phytophthora drechsieri f.sp. cajani in response to host differentials and fungicides

Singh, B. and Dubey, S.C. (2005) Variability in Phytophthora drechsieri f.sp. cajani in response to host differentials and fungicides. Indian Phytopathology, 58 (1). pp. 57-62.

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Seven differential hosts of pigeonpea distinguished population of P. drechsleri t.sp. cajani isolated from Delhi (PP-1), Bihar (PP-8), Uttar Pradesh (PP-2, 3, 4, 5 and 9 ) and Uttranchal (PP-6 and 7) into four variable groups as least aggressive (group-I; PP-1, 2 and 3), virulent (group-II; PP-4 and 5), moderately virulent (group-III; PP-6 and 7) and highly virulent (group-IV; PP-8 and 9). Individually, Pusa (Bihar) isolate PP-8 proved most virulent and isolate PP-2 from Ghaziabad (Uttar Pradesh) was least virulent. Variable sensitivity to apron 35 WS, rldornll MZ-72 WP and captafol 80 WP fungitoxicants among four selected isolates of P. drechsleri f.sp. cajani was noticed. Delhi isolate (PP-1) was tolerant to captafol with highest EC so (15.11 ,.,g a.i./ml) value whereas, Pantnagar isolate (PP-6) was highly sensitive with EC so (2.14 ,.,g a.i./ml). Kanpur isolate (PP-4) exhibited most tolerance to rldornll MZ-72 WP. In the case of apron 35 WS, Delhi isolate (PP-1) was most sensitive. Thus, the present studies showed the possibility of existence of four races of the pathogen in north India.

Item Type: Article
Additional Information: Authors are thankful to the Head, division of Plant Pathology, IARI for providing the facilities and Dr. K.D. Srivastava, Principal Scientists, Plant Pathology, I.A.R.I.,New Delhi for help and critical suggestions.
Uncontrolled Keywords: pigeonpea, fungicide
Author Affiliation: Division of Plant Pathology, Indian Agricultural Institute, India
Subjects: Plant Protection
Crop Improvement
Divisions: Pigeonpea
Depositing User: Mr Arbind Seth
Date Deposited: 03 Jul 2013 05:04
Last Modified: 03 Jul 2013 05:04
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