Investigations on Biology and Management of Colletotrichum capsici (Syd.) Butler and Bisby Causing Anthracnose of Chilli
Loading...
Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MPUAT, Udaipur
Abstract
The present study was undertaken on Investigations on biology and management of
Colletotrichum capsici (Syd.) causing anthracnose of chilli, as the diseases was observed in
moderate to severe level on Pusa jwala in Rajasthan. The studies were aimed; to determine
the distribution of the disease and the pathogen(s); morphological, cultural and pathogenic
variability of the pathogen and develop management strategy through integration of host
plant resistance, botanicals and fungicides.
The seed samples collected from different places on different cultivars yielded
various pathogens. The maximum mean seed infection (36.5%) by C. capsici, followed by
Cercospora sp. (17.3%) and Alternaria sp. (14.6%).
Four isolates of C. capsici, UDR Cc-01 (Rajasthan), BAN Cc-02 (Karnataka), GUJ
Cc-03 (Gujarat) and MP Cc-04 (Madhya Pradesh) were recovered from various samples
showed considerable variation in symptoms, growth characteristics, colony diameter, size of
conidia, rate of sporulation, size of setae and acervuli.
Isolate UDR Cc-01 of C. capsici was the most virulent, caused 49.6 per cent fruit
infection across the five chilli cultivars and MP Cc-04 was less virulent, in laboratory. The
isolates showed considerable variation in latent period, virulence and aggressiveness across
the five chilli cultivars. UDR Cc-01 of C. capsici was the most virulent as it caused shortest
latent period (65 hrs) and maximum per cent disease index (48.6) across the five cultivars.
Chilli cultivars Sadabahar and Mathania were exhibited moderately resistant to
resistant reaction with minimum mean disease score (1.4 and 2.0) and PDI 17.2 and 20.5
respectively, across the four isolates.
Of the five fungicides tested in vitro, tebuconazole and propiconazole were
completely inhibited the mycelial growth of C. capsici (UDR Cc-01) isolate at 500 ppm and
1000 ppm concentrations. Neem seed extract was also found effective in vitro. Under field
condition, propiconazole (0.1%) and tebuconazole (0.1%) and neem seed extract (0.2%)
were found more effective in reduction of the disease and increase the yields when applied
in integration as spray over their individual application as well as untreated control on Pusa
jwala. Integration of two fungicides tebuconazole (0.1%) and propiconazole (0.1%) was
also found effective in management of anthracnose of chilli. Since, the results suggested
considerable pathogenic variability in C. capsici isolates; therefore, it would be desirable to
evaluate promising chilli cultivars against the pathogen(s) and seed treatment plus spray of
fungicides involving botanicals for sustainable chilli cultivation.
Description
Investigations on Biology and Management of Colletotrichum capsici (Syd.) Butler and Bisby Causing Anthracnose of Chilli
Keywords
null
Citation
Tanwar and Bunkar, 2012