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Population dynamics, assessment of avoidable yield losses and biointensive integrated management of mustard aphid, Lipaphis erysimi Kalt. (Homoptera:Aphididae) in Brassica spp

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Title Population dynamics, assessment of avoidable yield losses and biointensive integrated management of mustard aphid, Lipaphis erysimi Kalt. (Homoptera:Aphididae) in Brassica spp
 
Creator Sharma, Deepak
 
Contributor Yadav, Satyapal
 
Subject Land management, Wheats, Costs, Crops, Productivity, Economics, Irrigation, Sowing, Fertilizers, Manpower
 
Description Field studies on population dynamics, assessment of avoidable yield losses and biointensive
integrated management of mustard aphid, Lipaphis erysimi Kalt. in Brassica spp. (B. juncea, B. napus
and B. rapa) were carried out during Rabi, season of 2015-16 at Regional Reasearch Station,
Samargopalpur, Rohtak (Haryana), India. Results of weekly observations on the mustard aphid
population showed that it was noticed in the field from 3rd SMW (January) to 11th SMW (March). The
peak aphid population (23.33-86.05 aphids/10 cm main apical shoot) was recorded during 9th SMW in
all Brassica species (both timely & late sown) except in BSH1 (timely sown) in which it attained its
peak (31.98 aphids/10 cm main apical shoot) in 6th SMW. The mustard aphid population had negative
correlation with evening relative humidity under timely sown conditions and positive correlation with
maximum temperature under late sown conditions in B. juncea (RH 0749) and B. napus (HNS 0901).
In B. rapa (BSH 1), the population of mustard aphid did not show any correlation with any of the
weather parameters.
The avoidable losses in terms of seed yield varied from 9.26 to 17.48 per cent under timely
sown conditions, while under the late sown conditions, these losses ranged from 20.11 to 32.62 per
cent. The avoidable oil content losses in all three Brassica spp. ranged from 3.38 to 6.34 per cent,
under timely sown conditions and 4.92 to 8.14 per cent under late sown conditions.
Bioefficacy studies indicated that the maximum aphid reduction over control after ten days of
spray was observed in dimethoate (95.03%) followed by Verticillium lecanii @ 108 CS/ml + NSKE @
5% (88.52%), NSKE @ 5% + Clipping of infested twigs (87.77%) and Beauveria bassiana @ 108
CS/ml + NSKE @ 5% (86.91%). Neem seed methanol extract @ 5 % was found to be the least
effective with 75.33 per cent reduction in aphid population over control after ten days of spray.
Considering the seed yield, the highest seed yield was recorded in treatment viz. dimethoate (1702
kg/ha) followed by V. lecanii @ 108 CS/ml + NSKE @ 5% (1635 kg/ha), NSKE @ 5% + Clipping of
infested twigs (1626 kg/ha) and B. bassiana @ 108 CS/ml + NSKE @ 5% (1617 kg/ha). The lowest
seed yield (1517 kg/ha) was obtained in neem seed methanol extract @ 5 % whereas the yield obtained
in control was only 1384 kg/ha. In the economics, dimethoate was found to be highly cost effective
with highest cost benefit ratio (1:14.92) followed by NSKE @ 5% + clipping of infested twigs
(1:13.81) and NSKE @ 5% (1:11.41), whereas, the treatment with neem seed methanol extract @ 5 %
was the least (1:0.51) economically feasible with lower economic returns per unit of input cost.
 
Date 2016-10-25T14:26:56Z
2016-10-25T14:26:56Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81867
 
Language en
 
Format application/pdf
 
Publisher CCSHAU