Marigold: a diagnostic tool for BGM forecasting and management in chickpea uri icon

abstract

  • To identify an alternative indicator for a reliable diagnosis, forecasting and management of Botrytis grey mould (BGM), several ornamental plants commonly grown during the chickpea season as a collateral host of Botrytis cinerea were evaluated. The controlled environment investigations on host pathogen interaction were carried out with marigold (Tagetes erecta). Flowering plants of marigold spray-inoculated with B. cinerea (3×105 conidia/ml) from chickpea and incubated in an environment (15°C and 100% relative humidity) needed for BGM development produced symptoms on leaves, flowers, flower buds and stems. At 6 days after inoculation (DAI), dark lesions were observed on a fully bloomed flower. All the young buds appeared completely rotted, but did not support sporulation. By 12 DAI, masses of wind-blown grey sporulation on flowers and flower buds were visible. Between 15 and 20 DAI, profuse grey sporulation was observed on all the aerial plant parts. The early infection of B. cinerea causing moldy infection on marigold identified its usefulness to farmers as a diagnostic tool to predict BGM epidemics and its management in chickpea

publication date

  • 2005