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Epidemiological studies on downy mildew of bitter gourd caused by Pseudoperonospora cubensis

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Author Affiliations

  • 1Indira Gandhi Krishi Vishwavidyalay, Raipur, CG, India
  • 2Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, MS, India
  • 3Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, MS, India
  • 4Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, MS, India

Res. J. Agriculture & Forestry Sci., Volume 5, Issue (8), Pages 1-5, August,8 (2017)

Abstract

Periodical development of disease during the period revealed that, there was an increase and decrease of downy mildew disease severity from fourth October to fourth January. Disease severity gradually increases from fourth October and continued till first November (25.97 to 59.10 %), where it reached at its maximum. The rate of disease development / unit /day (r value) varied from 2.6x10-4 to –6.82x10-5. The correlation between disease severity and environmental factors in bitter gourd indicated no definite relationship pattern. In most of the cases correlation co-efficient is negative except of relative humidity but not significant. Correlation is also positive in case of temperature difference. Maximum disease severity in first week of November is may be due to less difference in temperature and relative humidity.

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