Studies on population dynamics and management of whitefly, Trialeurodes vaporariorum on chrysanthemum under polyhouse conditions

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dc.contributor.advisorSingh, Mukesh Kumar
dc.contributor.authorhabiba, Rumi
dc.date.accessioned2018-08-02T10:04:03Z
dc.date.available2018-08-02T10:04:03Z
dc.date.issued2018
dc.description.abstractPopulation dynamics of whitefly (Trialeurodes vaporariorum) and its management through use of synthetic insecticides (Profenophos @ 500 g a.i./ha, deltamethrin @ 10 g a.i./ha, imidacloprid @ 20 g a.i./ha, thiacloprid @ 20 g a.i./ha, thiamethoxam @ 20 g a.i./ha and buprofezin @ 10 g a.i./ha) and botanical insecticides (neem oil @ 5%, neem oil @ 2%, karanj oil @ 5 %, karanj oil @ 2%, neem seed kernel extract (NSKE) @ 5%, and yam bean seed extract (YBSE) @ 5%) in chrysanthemum variety ‘Aris’ was studied at Hi-Tech Horticulture Unit of Dr. Rajendra Prasad Central Agricultural University, Pusa during Rabi 2017-18. Whitefly population was present on the crop throughout the cropping period. In the beginning, the whitefly population was low (4.72 whitefly/ three leaves) and reached to 67.26 whitefly/three leaves in the 49th SMW of December, 2017. Thereafter, whitefly population decreased continuously and the minimum population (22.66 per three leaves) was observed at the end of cropping season. The temperature (maximum and minimum) had a negative correlation with whitefly population while relative humidity in morning (7.00 hrs) had a positive correlation and the evening relative humidity (14.00 hrs) had a negative correlation. The weather parameters were found to contribute around 53.80 per cent impact on population of whitefly when acted together (R2 =0.5380). The mean per cent reduction over control in whitefly population by synthetic insecticides after first spray varied among the treatments. It was maximum (59.80%) in imidaclorprid treatment @ 20 g a.i./ha closely followed by profenophos @ 500 g a.i./ha (54.24%) and buprofezin @ 10 g a.i./ha (51.91%). After second spray, the mean per cent reduction was again maximum in imidacloprid treatment @ 20 g a.i./ha (63.43%) closely followed by profenophos @ 500 g a.i./ha (57.04%), buprofezin @ 10 g a.i./ha (54.41%) and thiacloprid @ 20 g a.i./ha (52.60%). Deltamethrin treatment @ 10 g a.i./ha recorded lowest mean per cent reduction (44.75%) in whitefly population. All the botanical insecticidal treatments were also significantly superior to untreated control in reducing the whitefly population on chrysanthemum. The mean per cent reduction over control in whitefly population varied from 30.84 - 47.65% after first spray, from 34.54 – 51.26 % after second spray and 41.84 to 55.69 % after third spray. Neem oil (5%), neem oil (2%) and NSKE (5%) were superior over other insecticidal treatments. All the synthetic insecticides were significantly superior over untreated control in increasing the yield of chrysanthemum flowers. The mean yield varied from 11.80 to 13.33 q/ha in insecticide treated plots. The increase in yield varied from the maximum of 3.00 q/ha in imidacloprid @ 20 g a.i./ha to the minimum of 1.50 q/ha in deltamethrin @ 10 g a.i./ha showing a corresponding increase of 29.12 and 14.56%, respectively. The cost - benefit ratio was found maximum in imidacloprid @ 20 g a.i. /ha (1:8.57) closely followed by profenophos @ 500 g a.i/ha (1:7.11) and buprofezin @ 10 g a.i. /ha (1:6.50). Deltamethin treatment@ 10 g a.i./ha recorded lowest cost benefit ratio (1:3.81). In botanical insecticides treated plots, the mean yield of chrysanthemum flowers varied from 11.53 to 12.32 q/ha. The increase in yield varied from the maximum of 1.67 q/ha in neem oil @ 5% to the minimum of 0.88 q/ha in karanj oil @ 2% showing a corresponding increase of 15.68 and 8.26% in yield of chrysanthemum cut flowers under polyhouse conditions. The cost -benefit ratio was found maximum in neem oil @ 5 % (1:6.32) closely followed by NSKE @ 5% (1:4.63) and neem oil @ 2 % (1:4.26)en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810063081
dc.keywordsChrysanthemum, Whitefly, Trialeurodes vaporariorum, Population dynamics, Control, Polyhouse conditionen_US
dc.language.isoenen_US
dc.pages49+vii+vien_US
dc.publisherDr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)en_US
dc.subEntomologyen_US
dc.subjectnullen_US
dc.themePopulation dynamics of whitefly (Trialeurodes vaporariorum) and its management through use of synthetic and botanical insecticidesen_US
dc.these.typeM.Scen_US
dc.titleStudies on population dynamics and management of whitefly, Trialeurodes vaporariorum on chrysanthemum under polyhouse conditionsen_US
dc.typeThesisen_US
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