Ecology and control of Alternanthera philoxeroides (Mart.) Griseb and Synedrella vialis (Less.) A. Gray
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Date
2022-11-26
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CSK HPKV, Palampur
Abstract
A field experiment was conducted at the Research Farm, Department of
Agronomy, CSK HPKV, Palampur during Kharif 2020 and 2021 to study the ecology
and control of Alternanthera philoxeroides (Mart.) Griseb and Synedrella vialis (Less.)
A. Gray. Eleven weed control treatments viz. glyphosate 1000 g/ha, paraquat 1000 g/ha,
2,4-D Na salt 1250 g/ha, 2,4-D ethyl ester 1000 g/ha, metsulfuron methyl 4 g/ha,
carfentrazone 25 g/ha, glufosinate ammonium 500 g/ha, bispyribac Na 20 g/ha,
flumioxazin 200 g/ha, diuron 500 g/ha and weedy check (control) were tested in
Randomized Block Design with three replications. To study the ecology of both the
weeds, experiments were conducted at three locations i.e. Research Farm of Department
of Agronomy (Palampur), KVK (Berthin, Bilaspur) and on farmer’s field (Kangra).
Alternanthera philoxeroides recorded the highest shoot length (97.25 and 100.75 cm)
and number of leaves per shoot (40 and 42) in the month of October and this weed did
not flower throughout the duration of study at both the locations i.e. Palampur and
Kangra. Whereas, Synedrella vialis exhibited a low growing, mat forming habit with
maximum shoot height (13 to 15.50 cm) and number of leaves per shoot (12) in August
and September. This weed propagated vegetatively (runner) as well as through seeds
since flowering occurred throughout the growth period at all the three locations. Results
of the weed control study revealed that the application of glyphosate 1000 g/ha and
metsulfuron methyl 4 g/ha behaving statistically alike were significantly effective in
reducing the count (No./m2
) and dry weight (g/m2
) of Alternanthera philoxeroides and
Synedrella vialis during both the years of study. The bioassay study indicated that all
the herbicides used for the control of these weeds did not retain any residue in the soil
and thus, can be considered safe for use.