Varietal Resistance and Efficacy of Novel Insecticides against Sucking Insect Pests of Clusterbean, Cyamopsis tetragonoloba (L.) Taub.
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Date
2022
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Abstract
Investigation on „Varietal resistance and efficacy of novel insecticides
against sucking insect pests of clusterbean, Cyamopsis tetragonoloba (L.)
Taub. were carried out at Agronomy Farm of S.K.N. College of Agriculture,
Jobner (Rajasthan) during Kharif, 2021.
Out of ten varieties of clusterbean crop screened for their comparative
resistance against leafhopper, whitefly and aphid, none of them was found
completely free from infestation. The varieties RGC-197 and RGC-986 were
categorized as highly resistant; RGC-1055, RGC-12-1, RGC-1017, RGC 1066 and RGC-1038 as moderately resistant and RGC-1002, RGC-1003 and
RGC-1033 as least resistant against leafhopper. The varieties RGC-1017 and
RGC-986 were categorized as highly resistant; RGC-197, RGR-12-1, RGC 1066, RGC-1055 and RGC-1038 as moderately resistant and RGC-1002,
RGC-1003 and RGC-1033 as least resistant against whitefly. The varieties
RGC-197 and RGC-1017 were categorized as highly resistant; RGC-1038,
RGR-12-1, RGC-1055 and RGC-1033as moderately resistant and RGC-1003
and RGC-1002 and RGC-1066 as least resistant to aphid.
The days to flower initation, plant height, pod length and fibre had non
significant correlation. The trichome density, pod width, number of pods per
plant, seed yield and total phenol had negative significant correlation,
whereas the free amino acid, chlorophyll and mositure content had positive
significant correlation with leafhopper, whitefly and aphid populations.
The bioefficacy of newer insecticides tested against leafhopper, whitefly
and aphid on clusterbean revealed that diafenthiuron 50 WP 0.05 per cent
(88.14%), chlorfenapyr 0.01 per cent (84.62%) and flubendiamide 39.35 EC
0.01 per cent (82.12%) were found most effective against leafhopper. In case
of whitefly, pyriproxyfen 0.005 per cent, diafenthiuron 0.05 per cent and
dimethoate 0.03 per cent (90.56 – 93.65% reduction) were found most
effective. In case of aphid, the most effective treatments were diafenthiuron
50 WP 0.05 per cent (95.62% reduction), buprofezin 25 SC 0.04 per cent
(93.62%) and dimethoate 30 EC 0.03 per cent (91.82% reduction).
The buprofezin 0.04 per cent and pyridalyl 0.015 per cent (5.66 – 5.67
Coccinella septempunctata/ 10 plants) were observed to inflict least adverse
effect on ladybird beetle, vis-à-vis in dimethoate 0.03 per cent, bifenthrin
0.016 per cent, pyriproxyfen 0.005 per cent and pymetrozine 0.025 per cent
were observed highly toxic (2.31-3.01 C. septempunctata/ 10 plants)proved
highly toxic group. In case of C. zastrowi,arabica pyridayl 10 EC 0.015,
pymetrozine 50 WG 0.025 per cent and chlorantraniliprole 18.5 SC 0.01 per
cent (3.0 – 3.19 /10 plants) were observed to inflict least adverse effect, vis-à vis in dimethoate 30 EC 0.03 per cent, followed by diafenthiuron 50 WP 0.05
per cent, pyriproxyfen 10.8 EC 0.005 per and pymetrozine 50 WG 0.025 per
cent (1.92 - 2.45/10 plants) proved highly toxic group.
Maximum yield of 10.31 q/ hectare was registered in the plots treated with
dimethoate 30 EC which was at par with diafenthiuron 50 WP (10.20 q/ha) and
pyriproxyfen 10.8 EC (10.07 q/ha). These treatments were followed by chlorfenapyr
39.35 EC and chlorantraniliprole 18.5 SC which revealed seed yield of 9.80 and 9.25
q/ ha. The minimum seed yield was recorded in pyridalyl 10 EC and pymetrozine 50
WPviz., 8.33 and 8.49 q/ha., respectively. The other treatments revealed seed yield
which ranked in the middle order.
The maximum increase in yield over untreated check was record in dimethoate
30 EC (0.03%) treated plots (5.31q ha-1
). The maximum net return was recorded in
the treatment of dimethoate 30 EC 0.03 per cent (` 24,150.00 ha-1
) followed
pyriproxyfen 0.005 per cent (` 23,072.00 ha-1
) and diafenthiuron 50 WP 0.05 per cent
(` 22,460.00 ha-1
). The maximum benefit cost ratio was recorded in the treatment of
pyriproxyfen 10.8 EC 0.005 per cent(10.13) followed by dimethoate 30 EC 0.03 per
cent (10.06) and diafenthiuron 50 WP 0.05 per cent (6.34).