Study of downy mildew (Pseudoperonospora cubensis (Berk. & Curt.) Rostov.) of cucumber (Cucumis sativus L.) under polyhouse in relation to weather parameters

Publication Date : 08/11/2016


Author(s) :

Reshma Raj T , Sainamole Kurian P.


Volume/Issue :
Volume 2
,
Issue 11
(11 - 2016)



Abstract :

Cucumber is one of the major vegetables cultivated under polyhouse in Kerala and downy mildew is one of the most devastating diseases affecting the crop inside the polyhouse. It is found that there is incidence of downy mildew in polyhouses irrespective of the season. Hence a survey was conducted to assess the influence of major weather parameters viz., relative humidity (RH) and temperature on the disease. It was found that the disease severity varied from 11.33 to 35.75 per cent when the RH inside the polyhouse varied from 79 to 97 per cent. Moreover at the same time, temperature inside the structure varied from 24.70 to 33.80 oC respectively. Correlation analysis proved that there is a significant positive correlation between disease incidence and severity with relative humidity (RH) inside the polyhouse and negative correlation with temperature. It was also found that there is a chance of incidence of downy mildew inside the structure if the RH ≥ 79 per cent.


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