IMPACT OF CULTIVATION METHODS OF RICE ON PEST AND DEFENDER POPULATION AND MANAGEMENT OF LEAF FOLDER, Cnaphalocrosis medinalis GUENEE WITH NEWER INSECTICIDES
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
A field experiment entitled “Impact of cultivation methods of rice on
pest and defender population and management of leaf folder,
Cnaphalocrosis medinalis Guenee with newer insecticides.” was conducted at
Agricultural College Farm, Bapatla, during kharif 2017. In the investigations,
population dynamics of insect pests and defenders in different planting methods
(normal transplantation, system of rice intensification, dry direct sowing, wet
direct sowing and drum seeding) of paddy and the efficacy of certain new
insecticides against rice leaf folder in dry direct sowing method were studied.
Among the different cultivation methods of rice on pest incidence
revealed that the lowest mean per cent leaf damage by leaf folder was observed
in dry direct sowing (5.30%) and drum seeding (5.33%), whereas the highest
mean per cent leaf damage by leaf folder was recorded in normal transplantation
(7.76%). In case of BPH and WBPH the lowest mean population per hill was
observed in system of rice intensification (3.95 and 2.28), whereas the highest
mean population of BPH and WBPH per hill was recorded in normal
transplantation (8.89 and 4.66), respectively. Similarly, green leafhopper mean
population per hill was lowest in system of rice intensification (1.21) and dry
direct sowing (1.29) and the highest mean population per hill was recorded in
normal transplantation (1.78).
In case of natural enemy population, the mean population of mirid bugs
per hill was highest in normal transplantation (4.71) method which was on par
with drum seeding (4.56) and wet direct sowing (4.35), whereas in system of rice
intensification the lowest mean population of 2.83 per hill was recorded.
Similarly, the highest mean population of coccinellids per hill was observed in
normal transplantation (1.06) and wet direct sowing (0.90) method, whereas the
lowest mean population per hill was recorded in system of rice intensification
(0.71). In case of spiders highest mean population per m2 was recorded in normal
transplantation (3.53) and dry direct sowing (3.28) whereas in system of rice
intensification the lowest mean population of 2.44 per m2 was noticed.
The impact of cultivation methods of rice on grain yield indicated that
system of rice intensification to be superior over other cultivation methods by
recording grain yield of 6432.50 kg ha-1 which was on par with dry direct sowing
and drum seeding with a grain yield of 6072.00 kg ha-1 and 5773.50 kg ha-1
respectively.
Management of rice leaf folder with certain newer insecticides revealed
that all the insecticide treatments were found superior over untreated control.
Amongst them, flubendiamide 39.35% SC @ 0.3 ml l-1, chlorantraniliprole 9.3%
+ lambda cyhalothrin 4.6% ZC @ 0.8 ml l-1 and chlorantraniliprole 18.5% SC
@ 0.3 ml l-1 were the most effective insecticides in reducing leaf folder
infestation with 63.71, 56.72 and 54.80 per cent reduction over untreated control,
respectively.
The plots treated with flubendiamide 39.35% SC @ 0.3 ml l-1,
chlorantraniliprole 9.3% + lambda cyhalothrin 4.6% ZC @ 0.8 ml l-1,
chlorantraniliprole 18.5% SC @ 0.3 ml l-1 and flubendiamide 19.92% +
thiachloprid 19.92% SC @ 0.5 ml l-1 recorded higher grain yield with 64.33,
63.46, 61.55 and 50.08 per cent increase over untreated control respectively.
Description
D5633
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