Seasonal impact on population dynamics of Phytophthora spp. and disease progression in Mandarin

Lad, R. S. and Gade, R. M. and Peddinti, Srinivasa Rao and et al, . (2021) Seasonal impact on population dynamics of Phytophthora spp. and disease progression in Mandarin. Indian Phytopathology, 74 (3). pp. 669-679. ISSN 0367-973X

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This may be the first attempt to correlate environmental parameters and soil ecology impacting disease situation in Nagpur mandarin due to Phytophthora. Fixed plot survey was undertaken at fortnightly intervals at six locations to analyse correlation between environmental factors and soil moisture with propagule density of Phytophthora as well as disease severity by using linear correlation. Rainfall, relative humidity and air temperature probes typically consist of three separate sensors packaged in a single instrument called as ‘SENSTUBE’ and that instrument was used for recording the data in field. Soil moisture was analysed in laboratory by using digital moisture meter. Fixed plot study indicated inoculum density of Phytophthora in the range of 5.2–29.6 cfu/g soil. Peak period of Phytophthora root rot in Nagpur mandarin was seen from June to September and mean disease intensity recorded in between 3.16 and 34.33%. Root rot in Nagpur mandarin gradually increased after heavy rainfall and progressed with faster rate when soil moisture with high humidity and low temperature and vice versa. Fortnightly study of gummosis disease intensity was in the range of 4.08–30.17%. Peak period of gummosis disease (August to November) was noted after one to two months of heavy rainfall having optimum temperature (below 30 °C) and high humidity. After heavy rainfall the pathogen population is drastically increased but oozing of gum was observed after monsoon. Phytophthora population and disease progression was directly proportional to environmental and soil parameters like rainfall, relative humidity, soil moisture, but inversely proportional to air temperature. This study will be helpful to the citrus growers to predict the timing of disease severity to take appropriate management practices in time. © 2021, Indian Phytopathological Society.

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Item Type: Article
Additional Information: The authors are thankful to the Information Technology Research Academy (ITRA), Ministry of Electronic and Information Technology, GOI, New Delhi for providing fellowship and funding to conduct this research work. We are also thankful to Indian Institute of Technology (IIT) Bombay and Indian Institute of Technology (IIT), Hyderabad for providing sensor-based data on environmental factors of all six experimental plots. The authors are also thankful to the farmers who cooperatively given their mandarin plots for present investigation.
Uncontrolled Keywords: Correlation; Gummosis; Nagpur mandarin; Phytophthora; Propagules; Root rot
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 24 Sep 2022 07:09
Last Modified: 24 Sep 2022 07:09
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