Since ages, man has developed various devices to scare or repel
birds from his cultivated crops.
Traditional methods like erection of scare crows, noise making
devices like crackers and carbide guns tying polythene bags are
quiet old.
But these methods are not reputed to
bring permanent relief for the farmer and, therefore, a safe and economic
method must be sought to reduce the damage.
In recent times use of reflective ribbon
or bird scaring ribbon has been found effective.
The reflective ribbon is popularly called
as bird scaring tape method evolved by the scientists of All India Coordinated
Research Project on Agricultural Ornithology is found to be more effective
and easily adaptable by the farmers in the field for scaring the birds,
particularly against rose-ring parakeet in sunflower.
It is a polypro pelene metallic shining
ribbon with red/yellow on one side and silver white on the other side
and is prepared by cutting into strips of 10 to 15 meters length and
15mm (1.5cm) width.
About 25-30 strips are fixed in an acre
with the help of bamboo poles keeping just one foot above the crop level
in north and south directions and slightly twisted to reflect the sunlight
throughout the day.
The inter distance between the two ribbons
should be about 4 to 8 meters (depending upon the crop size and pest
population).
During sun shine the brightness and
humming noise produced in the wind scares the bird from the field.
Other methods of control
Pruning of perching and breeding places, in addition to the manual
destruction of nests closing the entrance of the nests will reduce their
population.
Planting of flowering/fruit bearing trees or shade trees could reduce
losses on nearby crops once the parakeets become accustomed to being
able to feed on these trees without being disturbed.
Large acreage cultivation of sunflower crop reduces the bird damage.
Spraying of neem kernel powder solution (10 gms per litre of water)
after seed setting stage repels the birds.
Pre-recorded distress calls of parakeets (Bio-acoustic method) are
amplified with the help of speaker will drive away the parrots from
the field.
For complete protection of the crop from bird damage one method may
not be fool proof; as such, it would be more appropriate to take up
Integrated Bird Pest Management method i.e., combination of two or three
methods for effective pest management so that the crop is completely
protected during its vulnerable stages.
Sunflower is an important edible oilseed crop in India.
With the advance of production technology of high yielding varieties,
sound seed production and remunerative price the sunflower crop
cultivation has spread to many states in India.
Like any other crop the sunflower crop
is also subjected to attack by a number of bird pests.
The rose-ringed parakeets are the major
bird pests of sunflower crop causing 10 to 40% damage and in isolated
areas it may be more than 90%.
The parakeets are distributed throughout the country
and among the 12 species of parakeets the rose-ringed parakeet (Psittacula
krameri) is the most destructive bird pest in agriculture and horticulture.
They are commonly found in flocks in gardens, orchards, cultivated
areas and often near human habitations.
They invade the crop in flocks and inflict heavy damage and known
to waste much more than what they eat.
The bird damage starts from milky stage onwards and continues till
harvest.
A single parakeet consumes on an average about 15.0 g of sunflower
seed a day under captivity, giving an idea of the magnitude of loss
to the crop.
The damage to sunflower crop in isolated areas ranges from 10 to 40%
and in large acreage 3 to 5%.
The young nestlings unlike the other birds which are fed on insect
food, also feed exclusively on a vegetarian diet, comprising cereals,
pulses and oilseeds.
Hence, the bird has no beneficial role at any stage of its life cycle.