Pink Bollworm, Spotted Bollworm and Mustard Aphid (Pest characters, Nature of Damage and Control Measure)
 |
| Pink Bollworm. |
Pink Bollworm
Scientific name: Pectinophora gossypiella.
Family: Gelechiidae.
Order: Lepidoptera.
Pest characters
•
Moths flies at night and sight of night.
•
Adults are tining and dull in colour.
•
Antenna filiform type.
•
The moths lay eggs alone or groups.
•
The larvae start eating into the boll from the top to
downward.
Nature of Damage
1.
It is a serious pest of cotton. It attacks cotton when plant at time at bearing
stage.
2.
A female moths lay eggs singly or in batch on the underside of the leaves,
buds, flower or in green bolls.
3.
After hatching the eggs, larvae enters into the flower, buds or into the green
bolls.
4. When
flowers are infested due to the feeding of inside a characteristics symptoms
produced called ”Rosette bloom". Such flowers, buds fail to develop
boll.
5.
When green bolls are infested firstly the whole of the entry close down, but
the larvae continue feeding inside on the seed kernel.
6.
The attacked boll fall down permanently which grows mature don't contain good
gining and seed oil content also reduced.
Control Measure
A) Nonchemical
1.
Field sanitation after harvest.
2.
Deep Ploughing after harvest.
3.
Early sowing and harvesting.
4.
Sun drying of cotton seed.
5.
Fumigation of cotton seed.
B) Chemical
1.
Using systemic insecticides. e.g.
a)
Diazinon 60 EC @ 1.68 L/ha.
b)
Sevin 80 WP @ 22 L/ha.
c)
Ripcord/ Cymbush/ Fenon 10 EC @ 1.2 L/ha.
 |
| Spotted Bollworm. https://cststudy.blogspot.com/ |
Spotted Bollworm
Scientific name: Earias vittella.
Order: Lepidoptera.
Family: Noctuidae.
Pest Characters
•
The moths are tiny.
•
The hind wing of both species is white.
•
Broad, green, tripe across the length of the fore
wing.
Nature of Damage
They
lay eggs singly on shoots, small leaf, flowers bud and plant tops. Egg hatch between
4-5 days, newly hatched caterpillars enter into the growing shoot and
feed inside the vascular bundle and check translocation of food. Affected
shoot wither and die, at later stage of the plant they enter either into the
flowers bud or into the green boll. When flower buds are infested due to the
feeding their inside, a characteristics symptoms is produced called
"flared squire" afterwards fall down. When green bolls are
infested firstly, the hole of the entry closes down but the larvae feeding
inside the seed kernel. The attacked boll fall down prematurely which
grow mature do not contain good lint and the seeds oil content is reduced.
Control Measure
1.
Field sanitation after harvest.
2.
Avoid use of nitrogen fertilizers at the reproductive
stage.
3.
Early sowing and early harvesting.
4.
Use resistant varieties.
5.
Collection and destruction of infested bolls.
6.
Release egg parasitoid Trichogramma chilonis,
T. brasiliensis, and larval
parasitoids Chelonus blackburni
or Bracon brevicornis or Apanteles sp. at 35 to 70 days.
7.
Using systemic insecticides. e.g. Diazinon 60 EC @
1.68 L/ha, Ripcord/ Cymbush/ Fenon @ 1.2 L/ha.
 |
| Mustard Aphid. https://cststudy.blogspot.com/ |
Mustard
Aphid
Scientific name: Lipaphis erysimi.
Family: Aphididae.
Order: Hemiptera.
Pest characters
1.
Aphid are small, soft bodied, pearl shaped insects
that have a pair of cornicles (wax secreting tubes) projecting out from
the fifth or sixth abdominal segment.
2.
Light green to dark blackish green insect.
Nature of Damage
1.
Mustard aphid plays the key role in destruction the oil seed.
2.
Clusters of nymph and adults may be seen on the tender leaves, flower, stocks
and pods. Sucking the cell sap and giving out honey dew.
3.
The infested leaves turn on yellowish pale and acquire a curly appearance and
ultimately the flowers fail to form pods.
Control Measure
A) Nonchemical
1)
Set up yellow stick trap to monitor aphid
population.
2)
Destroy the affected parts along with aphid population
in the initial stage.
3)
Predatory bird Motacilla
cospica is actively feeding over aphids in February March.
B) Chemical
1.
Spraying Malathion/ Diazinon.
2.
Spray the crop with one of the following in the
flowering stage; oxydemeton methyl, dimethoate @ 625 1000 ml per ha.
Comments
Post a Comment