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Studies on seasonal incidence and management of apion amplum (faust) (apionidae: coleoptera) on greengram

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Title Studies on seasonal incidence and management of apion amplum (faust) (apionidae: coleoptera) on greengram
 
Creator A.J.Umesha
 
Contributor K.Basavana Goud
 
Subject Agricultural Entamology
 
Description Investigations on the seasonal incidence, monitoring by light trap, economic injury
level and management of A. amplum by intercropping and insecticides were carried out
during kharif 2005-06.
Studies on the seasonal incidence of the seed weevil, A. amplum on greengram
revealed that peak activity of the pest on greengram was noticed on the crop sown during the
month of July, which recorded highest mean population of weevils (6.96 weevils/plant),
highest per cent pod (63.30%) and seed damage (69.68%), whereas complete absence of the
pest was noticed on the crops sown from December to April.
Monitoring of A. amplum using modified ICRISAT light trap revealed that two peaks
were observed on weevil abundance i.e., on 30th and 40th standard weeks, which coincided
with peak field incidence of the pest. Correlation between trap catches and weather
parameters revealed that trap catches of A. amplum had significant positive correlation with
minimum temperature, morning relative humidity, evening relative humidity and also
rainfall, but trap catches had highly significant negative correlation with minimum
temperature.
Determining of economic injury level (EIL) for seed weevil A. amplum on greengram
revealed that EIL of seed weevil was 1.02 weevils/plant.
Investigations on the management of seed weevil by intercropping revealed that
greengram grown with pigeonpea and maize in the ratio of 4:2 and 2:1, respectively
minimized the activity of weevil. Significantly higher greengram equivalent yield was
recorded in redgram (9.95 q/ha) and maize (9.74 q/ha) intercropping system.
Evaluation of different insecticides under field conditions revealed that application of
fenvalerate @ 20 kg/ha and spinosad @ 0.2 ml/l was found effective in reducing the weevil
population, pod and seed damage to greegram. When the cost effectiveness was considered,
fenvalerate dusting @ 20 kg/ha and chlorpyriphos @ 2 ml/l spray recorded highest C:B ratio
of 1:2.23 and 1:1.86, respectively.
 
Date 2016-09-14T10:54:06Z
2016-09-14T10:54:06Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76599
 
Format application/pdf
 
Publisher UAS, Dharwad