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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue May 2020, 41 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Seasonal impact on life-fertility table parameters of Oligonychus sapienticolus Gupta infesting banana under Gangetic Basin of West Bengal, India

                                                                                                                                             

S. Dey and K. Karmakar* 

Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Nadia -741 252, India

*Corresponding Author Email : acarikarmakar@rediffmail.com

Paper received: 27.02.2019??????? ?????????????????????????????????????? Revised received: 12.07.2019????????????? ???????????????????????????????? Accepted: 26.11.2019

 

Abstract

Aim: The aim of the present study was to investigate the impact of seasonal variation on life-fertility table of Oligonychus sapienticolus Gupta.

Methodology: Adult mite population were collected from infested banana leaves and reared under laboratory condition. A cohort of 100 eggs laid at a time by a population of 100 gravid females was considered for the experiment. This cohort was used for constructing of age specific life-fertility table. Seasonal impact on different life-fertility table parameters were studied by using different formulas.          

Results: The perusal of data showed that the net reproductive rate, finite rate of increase and innate capacity for increase in number were highest during summer months, but mean generation time, doubling time and corrected generation time declined with increase in temperature.?? ???????????     

Interpretation: The study concludes that this mite prefer hot and dry climatic condition for better growth and development. So, during this period appropriate management measures against this mite will avoid the chances of yield loss of banana plantation. ???????   

Key words: Banana, Life-fertility table, Oligonychus sapienticolus, Seasonal impact

 

 

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