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SEASONAL INCIDENCE AND PEST MANAGEMENT STRATEGIES AGAINST SPOTTED POD BORER, Maruca vitrata (GEYER) IN RICE FALLOW BLACKGRAM

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Title SEASONAL INCIDENCE AND PEST MANAGEMENT STRATEGIES AGAINST SPOTTED POD BORER, Maruca vitrata (GEYER) IN RICE FALLOW BLACKGRAM
 
Creator DURGA RAO, G
 
Contributor NAGESH, M
 
Subject developmental stages, insecticides, animal developmental stages, land resources, diseases, inorganic acid salts, planting, yields, fruits, rice
 
Description A field experiment entitled “Seasonal incidence and pest management
strategies against spotted pod borer, Maruca vitrata (Geyer) in rice fallow
blackgram” was conducted at farmer’s field in Munipalle village during rabi
2009-10.
The larval incidence of M. vitrata on rice fallow blackgram commenced
during the second week of January (13.01.2010) i.e., early flowering stage of
the crop (41 days after sowing) and reached to peak level (21 larvae per 20
plants) during first week of February (03.02.2010) coinciding with maximum
flowering stage of the crop. The pest disappeared by the maturity stage of
blackgram (80 days after sowing).
Multiple regression analysis indicated that all the weather variables
(maximum and minimum temperature, morning and evening relative humidity
and rainfall) together accounted for 94.18 per cent variation in larval population
(R2 = 0.9418) which was significant. However, minimum temperature showed
negative and significant influence independently on variation in larval
population. Both morning and evening relative humidity showed significant and
positive influence on larval population. All weather variables accounted for
92.31 per cent variation in flower damage caused by larvae of spotted pod borer
(R2 = 0.9231) which was significant. Morning relative humidity showed
positive and significant influence on flower damage of rice fallow blackgram.
Weather variables accounted for 70.17 per cent variation in pod damage caused
by larvae of spotted pod borer (R2 = 0.7017) which was significant. All weather
variables showed non-significant influence on pod damage of rice fallow
blackgram.
Statistical analysis with t-test indicated that there was no significant
difference between Trichogramma released plot and control in reducing larval
population of spotted pod borer, flower damage and pod damage.
Among the eleven insecticides evaluated for their efficacy against
M. vitrata, spinosad (85.20%) and emamectin benzoate (84.35%) recorded
maximum reduction in larval population. With regard to per cent flower
damage, spinosad, emamectin benzoate and flubendiamide recorded 87.92,
86.81 and 83.80 per cent reduction, respectively. The incidence of spotted pod
borer on the basis of per cent pod damage was lowest in spinosad (11.83%),
emamectin benzoate (12.13%) and flubendiamide (13.70). Highest grain yield
was registered with spinosad (1760 kg/ha) followed by flubendiamide (1746.67
kg/ha) and emamectin benzoate (1733.33 kg/ha).
 
Date 2016-06-06T12:07:51Z
2016-06-06T12:07:51Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66836
 
Language en
 
Relation D9056;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY