Studies on life cycle and management of some important insect pests infesting walnut (Juglans regia Linnaeus)
KrishiKosh
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Title |
Studies on life cycle and management of some important insect pests infesting walnut (Juglans regia Linnaeus)
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Creator |
Arshad Abass
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Contributor |
Wani, N.A.
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Subject |
Walnut, Chaetoprocta, Incidence, Severity, Life cycle, Management
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Description |
The investigations entitled “Studies on life cycle and management of some important insect pests infesting walnut (Juglans regia Linnaeus)” were undertaken at Salar (Anantnag), Wussan (Ganderbal) and KVK Kulangam (Kupwara) districts of Kashmir Valley. Incidence and severity of the pests were studied for two cropping seasons 2009-2010 and 2010- 2011 in respect of two walnut pests viz., Chaetoprocta (Chaetoprocta odata Hewitson) and walnut husk fly (Rhagoletis completa Cresson). Regarding walnut husk fly incidence delta traps charged with methyl eugnol and ammonium carbonate were installed in majority of walnut growing belts of Kashmir valley but no trap catch was observed at any location there by concluding non existence of walnut husk fly in the valley. Chaetoprocta incidence and Severity was high in Salar (Anantnag) district followed by Wussan (Ganderbal), while as low incidence and severity was recorded in KVK Kulangam (Kupwara). Incidence of Chaetoprocta (Chaetoprocta odata Hewitson) revealed that the pest appeared in second fortnight of March on the terminal twigs and attained its peak population of 65.80(2010) and 68.80 (2011) in the Ist week of May at Salar (Anantnag) followed by 18.90 (2010) and 20.60 (2011) at Wussan (Ganderbal) however, 12.00 (2010) and 16.00 (2011) peak pest population was recorded in the secondfortngiht of May at Kulangam KVK (Kupwara), respectively. Mean percent pest severity varied among different locations in different years having the highest 78.74 per cent (2010) and 85.30 per cent (2011) in the first fortnight of May at Salar (Anantnag) followed by 57.96 per cent (2010) and 62.20 per cent (2011) at Wussan (Ganderbal) while as lowest mean percent pest severity was recorded at KVK Kulangam (Kupwara) 42.62% (2010) and 50.02 (2011) in the second fortnight of May. Positive correlation coefficients were computed between the population build up and the independent effect of maximum and minimum temperature at Salar (Anantnag), Wussan (Ganderbal) and KVK Kulangam (Kupwara). Similar correlation was recorded for minimum relative humidity and rain fall at the same locations at 0.05 and 0.01 levels of significance. The effect of maximum relative humidity indicated negative correlation coefficient with the pest population build up at Salar (Anantnag) and Wussan (Ganderbal) however, at Kupwara maximum relative humidity indicated positive correlation. Chaetoprocta (Chaetoprocat odata Hewitson) is a monophagous pest having only one generation in a year, which starts its activity from March till July. Egg stage is the overwintering stage of the pest which lasts from July to March (246-260.50) days under laboratory conditions. Larval stage lasts for (34 to 48.50) days from the second fortnight of March to second fortnight of May having the 2nd instar larvae as the most damaging stage. Pupation of the pest starts from the second fortnight of May (17.50-22) days. Adults emerge from pupae in the month of June .Adult life span for the pest was 15.50-24.50 days in case of male and 20.50-27 days in case of female. Pooled relative efficacy of different insecticides in field trials at three locations during 2010 and 2011 revealed that high mean per cent mortality was registered by imidacloprid 200 SL @ 0.03 per cent at all the three locations with pooled mean per cent mortality of (91.78) followed by dimethoate 30 EC @ 0.05 per cent (88.71). The lowest mean per cent mortality was observed in neem 20 EC @ 0.03 per cent (61.55). While as the percent mortality of chlorpyriphos @0.03 per cent was (72.48) and for alphamethrin @ 0.05 per cent it was (76.58). The relative efficacy of five insecticides was imidacloprid 200SL (91.78%) > dimethoate 30 EC (88.71%) > alpahamethrin 10 EC (76.58 %) > chlorpyriphos 20 EC (72.48%) and neem 20 EC (61.55%). Among sixteen treatments of cultural control measures applied, soil hoeing + irrigation as combined treatment proved to be effective for the management of the pest at all the locations having lowest pooled mean per cent leaf infestation (23.22). |
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Date |
2016-08-19T14:52:56Z
2016-08-19T14:52:56Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/73053
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Language |
en
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Format |
application/pdf
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Publisher |
SKUAST
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