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Morphological variability, mycelial compatibility and fungicidal sensitivity of Colletotrichum gloeosporioides causing leaf spot of ginger (Zingiber officinale Rosc.)

DSpice at Indian Institute of Spices Research

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Field Value
 
Creator DARSHANA, C N
PRAVEENA, R
ANKEGOWDA, S J
BIJU, C N
 
Date 2014-08-05T05:01:49Z
2014-08-05T05:01:49Z
2014
 
Identifier Journal of Spices and Aromatic Crops 23 (2) : 211–223 (2014)
0971-3328
http://hdl.handle.net/123456789/1157
 
Description Colletotrichum gloeosporioides isolates causing leaf spot of ginger were collected from diverse agroecological regions of Kodagu, Hassan, Shimoga and Chikmagalur districts of Karnataka (KAG 1-6) and Idukki and Wayanad districts of Kerala (KLG 1-3). Diversity analysis of the isolates
revealed existence of considerable variability in the field populations of the leaf spot pathogen. Colour of the colony varied from white to dull grey and considerable variation was observed in
the growth rate of the isolates. The conidial shapes varied with regions and were cylindrical with tapering ends, cylindrical, elliptical or dumbbell, whereas, most of the isolates belonged to cylindrical with tapering ends category. The appressoria were either unlobed, single lobed or multilobed. The size of conidia and appressoria ranged from 12.2-18.3 × 6.1-6.9 μM and 9.0-14.8
× 6.2-11.0 μM, respectively. Mycelial compatibility studies among the nine isolates revealed that, the isolate, KLG 3, originating from Kerala was most compatible with other isolates, while KLG 1 and KAG 6 exhibited a highly incompatible reaction. Microscopic observations to study the
process involved in compatible reaction showed the aggregation of hyphae at region of contact, fusion of hyphae (formation of ‘H’ – like structure) and subsequent generation and growth of new hyphae from the point of contact. Among the fungicides tested at recommended dosages, propiconazole was found to be promising followed by carbendazim + mancozeb. The present
study indicated that leaf spot caused by C. gloeosporioides is emerging as a major foliar disease in the ginger growing tracts.
 
Format 1922774 bytes
application/pdf
 
Language en
 
Publisher Indian Society for Spices
 
Subject Colletotrichum gloeosporioides
diversity
fungicidal sensitivity
ginger
leaf spot
mycelial compatibility
 
Title Morphological variability, mycelial compatibility and fungicidal sensitivity of Colletotrichum gloeosporioides causing leaf spot of ginger (Zingiber officinale Rosc.)
 
Type Article