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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)
 
Creator Arshad Abass
 
Contributor Wani, N.A.
 
Subject Walnut, Chaetoprocta, Incidence, Severity, Life cycle, Management
 
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).
 
Date 2016-08-19T14:52:56Z
2016-08-19T14:52:56Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73053
 
Language en
 
Format application/pdf
 
Publisher SKUAST