Browsing by Author "H.S. Vanajakshi"

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Seasonal occurrence of major insect pests infesting pea (Pisum saivum L.) in relation with abiotic factors
(DAV College, 2020) Ram Keval; H.S. Vanajakshi; Sunil Verma; Abhinav Kumar
To study the seasonal incidence of insect pests of pea (P. sativum) viz. H. armigera and A. caccivora, the investigation was carried out during Rabi session of 2016-17 and 2017-18, at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh. Seasonal incidence of pests infesting pea was recorded from 50th SMW to 11th SMW, during the observation it was found that H. armigera persisted in field from 52nd SMW to 11th SMW with peak during 9th SMW (5.30 larvae/meter row length). A. craccivora population persisted in the field from 51st to 11th and attained peak level during 5th standard week (68 aphids/top 15 cm twig). During both the years correlations study revealed that revealed that H.armigera and A. craccivora showed positive association with maximum temperature, minimum temperature, sunshine hours, and wind speed whereas, negative association with morning and evening relative humidity, however, the A. craccivora population shows positive correlation with minimum temperature, morning and relative humidity and negative correlation with maximum temperature, sunshine hours and wind speed. Likewise, observations during 2017-18 revealed that the incidence patterns and correlations studied follow somewhat same trend as in previous year. © 2020 DAV College. All rights reserved.