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Subject: Entomology × Author: Josan, Chaand × End date: 2020 × Start date: 2020 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Population dynamics, screening and management of leafhopper, Empoasca flavescens (Fabricius) on Castor
    (CCSHAU,HiSAR, 2020-09) Josan, Chaand; Yadav, Satyapal
    The present study entitled “Population dynamics, screening and management of leafhopper, Empoasca flavescens (Fabricius) on Castor‟‟ was carried out during Kharif, 2019 at research farm of CCSHAU, Regional Research Station, Bawal. The incidence of leafhopper was first appeared during second week (37th SMW) of September (4.50 leafhopper/three leaves) and last up to fourth week (9th SMW) of February with peak population during third week (43rd SMW) of October with (25.40 leafhopper/three leaves). The incidence of leafhopper population showed significant positive correlation with maximum temperature (r = 0.401*). The maximum infestation of leafhopper was recorded in the genotype DCH-177 with a mean population of 8.3 leafhopper/three leaves while minimum (2.3 leafhopper/three leaves) in case of Maharaja-9. Phenols showed a significant negative correlation with leafhopper population and hopper burn score while total carbohydrates had a significant positive correlation with leafhopper population and hopper burn score. The highest yield was recorded in Maharaja-9 (41.1 q/ha) while lowest yield was recorded in SLCH-158 (28.8 q/ha). Dimethoate 30 EC @ 825ml/ha proved most effective against leafhopper as the lowest mean population (4.62 leafhopper/three leaves) was found with 81.26% reduction over control which was significantly different from other treatments. Among the bio-pesticides Nimbecidine 1500 ppm @ 2.5 l/ha proved most effective with mean leafhopper population of 17.06 leafhopper/three leaves while NSKE 5% was found least effective with maximum mean population of 21.06 leafhopper/three leaves and per cent reduction (12.83%) over control. The highest yield (40.50 q/ha) was also recorded in Dimethoate 30 EC @ 825ml/ha while lowest yield (22.75 q/ha) was recorded in Neem oil 5% except control.