Management of aphids in coriander
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bapuj...@gmail.com
Apr 21, 2010, 11:32:01 PM4/21/10
to Plant Protection India
Management of aphids in coriander
Coriander, popularly known as ‘ Dhania,' is an important condiment. It
is grown in kitchen gardens as well as in vast land areas for herbage
and seed purposes.
This plant is frequently attacked by two species of aphids such as
Brevicoryne corianderi and Hyadaphis corianderi. The nymphs and adults
of these aphids suck plant sap from the leaves and tender shoots.
Honey dew
Leaves get twisted and the vitality of the plant is affected. The
honey dew excreted by these insects gives out a glistening appearance
of the canopy which in turn gets covered with dark coating by the
development of black mould.
The affected plants yield less. Severe infestation in early stages
results in death of plants.
The aphids multiply throughout the year, are yellowish green in
colour, measuring to 1 to 2 mm in size. About 50 nymphs are laid by
the adult female. Young ones take 8-12 days to mature. The entire
lifecycle is completed in 14 to 21 days during summer and six weeks in
winter.
Management practices
— Cultivate resistant varieties of coriander and avoid late sowing and
adopt early flowering types.
— Clip off the infested plant parts bearing aphid colonies and destroy
them.
— Dust the canopy with cowdung ash early in the morning.
— Spray foliage with 2 per cent neem oil suspension. Apply fungal
pathogen, Beauveria bassiana under humid condition.
— Spraying of methyl-dementon 0.05 per cent or carbaryl 0.1 per cent
will be highly effective.
— Avoid use of toxic pesticides on coriander grown under kitchen
garden.
— Harvest the plants at least seven days after the application of
insecticides.
J. Jayaraj
& D.S. Rajavel
Agricultural College and Research Institute Madurai
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Coriander, popularly known as ‘ Dhania,' is an important condiment. It
is grown in kitchen gardens as well as in vast land areas for herbage
and seed purposes.
This plant is frequently attacked by two species of aphids such as
Brevicoryne corianderi and Hyadaphis corianderi. The nymphs and adults
of these aphids suck plant sap from the leaves and tender shoots.
Honey dew
Leaves get twisted and the vitality of the plant is affected. The
honey dew excreted by these insects gives out a glistening appearance
of the canopy which in turn gets covered with dark coating by the
development of black mould.
The affected plants yield less. Severe infestation in early stages
results in death of plants.
The aphids multiply throughout the year, are yellowish green in
colour, measuring to 1 to 2 mm in size. About 50 nymphs are laid by
the adult female. Young ones take 8-12 days to mature. The entire
lifecycle is completed in 14 to 21 days during summer and six weeks in
winter.
Management practices
— Cultivate resistant varieties of coriander and avoid late sowing and
adopt early flowering types.
— Clip off the infested plant parts bearing aphid colonies and destroy
them.
— Dust the canopy with cowdung ash early in the morning.
— Spray foliage with 2 per cent neem oil suspension. Apply fungal
pathogen, Beauveria bassiana under humid condition.
— Spraying of methyl-dementon 0.05 per cent or carbaryl 0.1 per cent
will be highly effective.
— Avoid use of toxic pesticides on coriander grown under kitchen
garden.
— Harvest the plants at least seven days after the application of
insecticides.
J. Jayaraj
& D.S. Rajavel
Agricultural College and Research Institute Madurai
--
You received this message because you are subscribed to the Google Groups "Plant Protection India" group.
To post to this group, send email to plantprote...@googlegroups.com.
To unsubscribe from this group, send email to plantprotectioni...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/plantprotectionindia?hl=en.
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