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Role of some plant extracts and insecticides against major insect pests of citrus with special reference to dissipation study of imidacloprid

KrishiKosh

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Title Role of some plant extracts and insecticides against major insect pests of citrus with special reference to dissipation study of imidacloprid
 
Creator Phartiyal, Tanuja
 
Contributor Srivastava, Poonam
 
Subject plant extracts, insecticides, insect pests, citrus, dissipation, imidacloprid, pest control, biological control, organic farming, Uttarakhand
 
Description Thesis-PhD
The role of plant extracts and insecticides with reference to dissipation study of imidacloprid was undertaken to study the antifeedant and growth regulatory activity against major insect pests of citrus along with the evaluation of half life and waiting period of imidacloprid in citrus fruits were conducted at G.B.P.U.A. &T., Pantnagar during the year 2012 and 2013. Seven plant extracts viz. Azardicta indica, Eupatorium triplinerve, Melia azardiracta, Cannabis sativa, Nerium indicum, Ocimum Sanctum and Parthenium hysterophorus at 5, 10 and 15% concentration were evaluated against 5 days old larvae of P. demoleus. At 5% concentration A. indica (15.87%) showed highest and E. triplinerve (7.49%) showed least antifeedant activity. While at 10% concentration A. indica (23.45%) recorded highest and C. sativa (9.88%) showed least feeding inhibitory activity. At 15% concentration highest antifeedant activity was recorded in M. azardiracta (28.30%) and least in A. indica (22.65%). The growth and developmental study revealed a significant reduction in weight gain at 6 DAF in M. azardiracta (0.269g) at 10% concentration. Antifeedant activity of Ageratum conyzoids, Calocacia esculenta, Annona squamosa Vitex negundo, Calotropis procera, Lantana camara and Mentha arvensis at 5, 10 and 15% concentration was evaluated against P. polytes. At 5% concentration M. arvensis (46.04%) showed highest antifeedant activity. While at 10% concentration A. squamosa (22.74%) showed highest and C. esculenta showed (17.92%) least antifeedant activity. At 15% concentration highest antifeedant activity was recorded in M. arvensis (20.96%) and least in V. negundo (11.48%). At 6DAF, A. squamosa (0.273g) caused significant reduction in mean weight gain/larva at 10% concentration. The per cent reduction in nymph and adult population was recorded to be highest in imidacloprid @ 0.008% with 92.93 and 100.00 per cent and lowest in neem with 30.84 and 44.11 per cent nymph and adults respectively @ 5ml/lit. during the year 2012-13. The highest per cent reduction in the population of larva of lemon butterfly was recorded in imidacloprid with 60.71 per cent whereas kalabasa was observed to be least effective with lowest per cent reduction of 16.66 per cent during 2012. However, imidacloprid was observed to be most effective with 41.66 per cent reduction and lowest efficacy (20.50 per cent) was recorded in kalabasa during the year 2013. Dissipation of imidacloprid was estimated in the rind and pulp of lemon fruit on high performance liquid chromatography (HPLC). The average initial deposition on rind of lemon was found to be 2.66 and 3.02 mg/kg after 1st and 2nd spray respectively. The corresponding values in the pulp were observed to be 0.05 mg/kg. A sudden decline in the residue levels in the rind and a corresponding increase in the pulp was observed on 7th day, thereafter, the residue levels steadily decreased both in the rind and pulp. Residues of imidacloprid were below its maximum residue limit (MRL) of 1.0 mg/kg in whole citrus fruits at zero day sampling. Waiting periods for imidacloprid in the rind and pulp of lemon fruit was 7.38 and 0.57 days under agro-climatic condition of tarai region of Uttarakhand.
 
Date 2016-11-04T14:09:21Z
2016-11-04T14:09:21Z
2014-01
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/83931
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)