Traditional method of rice transplantation being practised by some of students of Agriculture at Institute of Agriculture and Animal Science, Paklihawa Campus.
Blog created for providing information about some of the agriculture based technologies among the students and those who have keen interest in the development of the agriculture.
Friday, April 3, 2015
Wednesday, March 25, 2015
PHYSICAL METHOD OF PEST MANAGEMENT
Sometimes the most
efficient way to kill insects is to stomp on them, literally or figuratively.
Physical control method can be as simple as hand-picking the bagworms from a
juniper bush, cutting tent caterpillars out of a shade tree, or using a fly
swatter and window screens to keep your home free of flying insects. Physical
Pest Control is a method of getting rid of insects and small rodents by
removing, attacking, or setting up barriers that will prevent further
destruction of one's plants. These methods are used primarily for crop growing, but some
methods can be applied to homes as well.
Physical control
method of insect pest comprises a number of technologies, some of which are
based on active methods: Thermal shock (heat), electromagnetic radiation (microwaves,
infra-red, radio-frequencies), mechanical shocks and pneumatic control (blowing
or vacuuming tools). In the field, physical barriers represent the only passive
technique available. This method aims to reduce the pest population by using
devices that affect their physical environment.
Methods
- 1. Manipulation of Moisture:
Drying of grains up to less than 10% moisture before storage is a very
good practice to prevent insect pest damage and draining of standing water is
most effective method of destroying mosquitoes.
- 2. Barriers
Row covers
are useful for keeping insects out of one’s plants, typically used for horticultural
crops. They are made out of either plastic or polyester.
They are made thin and light to allow plants to still absorb sunshine and water
from the air.
Diatomaceous earth, made from fossilized and
pulverized silica
shells, can be used in order to damage the protective cuticle layer of insects that have them
such as ants. When
this layer is damaged, the insects become vulnerable to drying out.
Unfortunately, the effectiveness of Diatomaceous earth decreases if it is wet.
Therefore, it must be used often.[2]
This method was used back in the 1930s and 1940s when farmers would run dust over their fields.
This would have the very same effect as diatomaceous earth.
3.
Traps
Fly paper
or sticky boards are devices used in order to capture insects as they land upon
the surface of the trap. They are covered in a substance that attracts insects,
but are actually very sticky or poisonous. These traps are commonly used for flies or leafhoppers.[3] Fly paper and sticky boards, for
example, are often used in greenhouses to control whiteflies or leafhoppers.
Fruit and shade trees can be protected from various pests (e.g., plum
curculio, gypsy moth, and codling moth) by tying a band of folded burlap around
the trunk with its open side facing down. As insects climb up the trunk,
they are waylaid in the folds of burlap which can be treated with insecticide
or inspected daily to collect the pests.
4.
Manipulation of Temperature:
a) Cold
storage: Placing produce inside of cold
storage containers lengthens how long the produce lasts while also
hindering the growth of insects inside of them. Cold storage of agricultural
products prolongs their shelf life and retards the development of insect pests.
Most of insects become inactive around
freezing point. Cold storage of fresh and dry fruits or vegetables is practiced
to avoid fruit flies and potato tuber moth (PTM) damage.
b) Heat
treatment: Another method to use is to heat, as it will kill the insect
larvae in certain types of produce. Heat treatments are sometimes used in place
of fumigation to kill insect larvae in certain types of produce.
Mangoes, for example, are submersed in hot
water baths (115°F for 68 minutes) to kill the eggs and larvae of fruit
flies (Tephritidae) prior to export.
c) Thermal
shock: This approach is nonetheless is based on the premise that the
commodity or the crop to be protected will be less sensitive than the target
pest to an abrupt change in temperature. Research on thermal sensitivity and
physiological reactions to short duration thermal stresses is central to the
development of control methods based on thermal shocks.
d) Fire:
For farmers, fire
has been a powerful technique used to destroy insect breeding grounds. It is
used to burn the top of the soil in order to kill the insects that lie there.
Unfortunately, this can present some drawbacks. Fire can make the soil much
less effective or get rid of the insects that are beneficial to the plants.
Also, there is no guarantee that it will actually solve the pest
problems since there may be larvae below the surface of the soil. Fire may not kill healthy
larva and pupa of pests that overwinter beneath the soil but may kill
beneficial insects overwintering near the soil surface.
e) Flame
throwers: Flame throwers are employs against locust, hoppers etc they may
also be used for burning weeds, scrub vegetations and localized sterilization
of the soil. A flame thrower is essentially a pneumatic sprayer in which the
lance is modified into a burner. The tank is field with kerosene, which on
burning produces intense heat. The burner is so enclosed that the flame is
thrown upward. By providing a hood it can also be thrown downward. In the 1950's and 1960's enterprising farmers
in the Midwest built tractor-driven flame throwers that used liquid propane (LP
gas) to ignite and burn off the stubble from corn fields in the hope that a
variety of soil dwelling pests would be killed by the heat.
5. Tillage:
Tillage was one of the first methods for controlling soil inhabiting pest. Exposure
of overwintering phases of various insect pest to the sunlight after tillage
helps in killing the insects before they reach to active stage. Also some larva
such a white grubs are also exposed out to sun and birds.
6. Manipulation of light:
a) Light
traps: This types of traps are useful for controlling the phototropic
insects like moths, beetles etc. Insects are attracted to light and they get
entered to the trap. Light traps are also called as “Bug Zappers”.
b) Visible
light can be used in 3 ways in controlling insects:
i.
By producing photo taxis: (+)ve
phototaxis= attracting effect
(-)ve
phototaxis = repelling effect
ii.
By inducing diapauses
iii.
By modifying oviposition
7. Use
of Radiant energy:
Several
avenues have been explored for applying the different forms off electromagnetic
radiation as a tool for controlling insects. Non-ionizing electro-magnetic
radiation kills insects by raising their internal temperature. The utilization
of radio, micro wave and infra red frequencies is based on a principle similar
to that of thermal shock method except that, with applications involving
electromagnetic radiation, the transfer of energy occurs without using a heat
transfer fluid. The technologies that harness electromagnetic radiation are
often too expensive for use in the field.
The
radiant energy which have been used in insect control are:
i.
Radio Frequencies
ii.
Infra-red light
iii.
UV-light and Visible light
iv.
X-ray
v.
Gamma-ray
Some other
examples of Physical pest control:
Simple entrapment
devices work quite well to control some types of insects. Fly paper
and sticky boards, for example, are often used in greenhouses to control
whiteflies or leafhoppers. Fruit and shade trees can be protected from
various pests (e.g., plum curculio, gypsy moth, and codling moth) by tying a band
of folded burlap around the trunk with its open side facing down. As
insects climb up the trunk, they are waylaid in the folds of burlap which can
be treated with insecticide or inspected daily to collect the pests. Ditches
or moats with steep vertical walls are occasionally used as barriers
to keep crawling insects (e.g., chinch bugs or white fringed beetles) from
migrating out of one field and into another. Pitfall traps are dug at
3-5 meter intervals in the ditch and filled with kerosene or creosote to kill
the pests.
References:
Chattopadhyay.S.B.1993.Principles and
procedures of plant protection.3rd edition.Oxford & IBH
publishing co.pvt.ltd.New Delhi
Keller.S,Yubak
Dhoj G.C.2013.Crop pest of Nepal and their management
Pedigo.L.P.2002.Entomology
and pest management.4th edition.Prentice hall of India pvt.ltd.New
Delhi.India
Sunday, March 22, 2015
Importance of Light Trap in IPM
Introduction:
Integrated Pest Management (IPM) refers to the integration of various
principles and practices for the management
of pests, so that it suppresses pest population below the economic injury level
(EIL). IPM is an effective and
environmentally sensitive approach to pest management that relies on a combination
of common sense practices. IPM programs use current, comprehensive information
on the life cycles of pest and their interaction with the environment. This
information , in combination with available pest control methods, is used to
manage pest damage by the most economical means, and with the least possible
hazard to people, property, and the environment.
Light
traps are basically prepared on the principle that, most of the night flying insects
are attracted towards the light source. Insects appear to be strongly attracted
at light of 3650A. These are designed in such a way that when the insects are
attracted and come close to the light source fitted in the apparatus they are
fall in the trap fitted. Light traps can be used in various fields of
pest (insect) infestations. They are used in vegetable fields, agronomy fields,
fruits orchard, agro products storage , research fields, sometimes household,
etc. These traps are successful in controlling certain species of moths, flies,
some bugs, some flying beetles, etc.
Figure
1: Generalised
light trap
Classification
of light traps:
There are various light traps based
on design and the light source used. Light sources range from simple oil lamps
to different electric source. Special
light sources called black light have been developed and are particularly
efficient because of the type of light they emit. They should be considered in
situations when other light sources
(house, street light) are competing with the traps.
Design
or Construction:
Light trap contains basically
two parts in it. One is the light source to attract insects and other the
killing device to kill insect. Often there is a container with water placed
under light source. It is better to add some soap in the water used for
effective killing. Similarly sticky plates can also be used instead of water
container. In some cases chemically treated nets can also be used to collect
the insects trapped.
Advantages
of light trap:
·
Easily traps insect
species
·
Cheaper in price and is
hence affordable
·
Killing of insects
favoured instead of chasing n repelling so controls permanently
·
Can be used in various
places agri and non-agri purposes
·
Do not posses danger and
residue problem
·
Gives immediate results
·
Requires low labour
·
Farmers can operate it
it learnt once
·
Simple light traps can
be made in home also using locally available light source
·
There is no problem of
resistance
·
Safe to man, animal and
natural enemies
·
Favours sustainable
agriculture
·
Least or no chance of
pollution
Disadvantages
of light trap:
·
Requires few technical
knowledge to operate
·
Highly efficient traps
are quite costly
·
Not available to the
all rural parts of the country
·
Is specific to
particular nocturnal insects only
·
Beneficial insects are
also killed along with the harmful insects
Proper functioning of light trap:
·
Once installed, insect
light traps need little attention- just empty tray or replace the glue boards
occasionally
·
ILT units function well
as long as the bulb is lit
·
Traps with glue boards
are better and more efficient than electrocutors
·
ILTs can be placed over
or near food and food contact surfaces
·
Black light blue(BLB)
bulbs or combinations of BLB and black light(BL) bulbs are more effective than
BL lamps alone
·
Stunning circuitry
improves the catch of glue board ILTs
·
Ultraviolet emissions
from ILTs can effect human health
Light Trap In IPM:
Light traps are the most effective and safe tools used for the IPM
purpose. These never deviate the principles of IPM. These traps favour in the
distraction towards chemical pesticides and insecticides. Worldwide pesticide
problem was considered in light trap
invention. Ill effects due to various chemical pesticides are also avoided
after the use of light traps. Pest can develop resistance against pesticides,
which is completely avoided in case of IPM’s light trap technique. Light trap
application favours in the sustainable agriculture practice, since it doesn't
give any residual effects on the field.Light traps never harms the useful soil
organisms, which is a part of ideal IPM.
Conclusions:
Hence light trap has been found to be very essential part of IPM, which
follows the IPM practice almost ideally. According to the requirement it can be
set to either kill the pests or simply trap only. Trapped insects can also be
used for study about the nature and their potentiality to be used under IPM
practice. Finally Light Trap has been accepted to have significant importance in IPM.
Saturday, March 21, 2015
Cultivation Practices of Potato in Nepal
Introduction:
Potato,
the tuber crop is the major field crop that rank first in terms of productivity
and fourth in terms of production areas. It occupies more than 80% of the
cultivated area in Europe and other areas and fulfills the food requirement by
50- 60 %.
Importance:
From
the nutritional point of view, potato is the best source of food. It contains
high amount of starch, protein (2%), fat (0.1%) and carbohydrate (19.4%). In
comparison to cereal crops, starch and protein in potato has high
digestibility. It has high biological value that is 98 in comparison to 82 in
wheat and rice respectively.
Except
Vit-A &Vit-E, it contains Vit-B6 & Vit-C in adequate amount.
Besides, it contains minerals (Fe, Ca, P, Mg, and S). According to British
Association Certification, consumption of 125-150gm of potato daily fulfills
the need of vitamins.
Besides,
consumption of potato is advantageous to blood pressure, anemia, gastritis etc.
Potato
is the native of South America and was cultivated by Incas. It was introduced
into Europe by the early Spanish explorers during sixteenth century.
Botany:
Potato
belongs to family Solanaceae. It is herbaceous annual and propagated by seeds,
tubers (stolen). The stolen are slender, arising from buds, length and diameter
varies with varieties. Eyes on the potato are buds and one or more develop into
stem and leaves. Stem are green, leaves are compound with opposite leaflets.
Height ranges from one to two feet depending upon variety. Roots are shallow
extent up to two feet. Flowers are one inch in diameter, corolla white or
purple. Fruit berry but commonly not developed. Seeds are similar to the seeds
of mustard and heterozygous.
Climatic requirements:
Potato
is cool season crop but is only moderately tolerant to frost. Temperature
during the growing season has great influence in the yield. Generally, for
germination 8Oc is ideal. At very low temperature, growth and
development is checked. Day temperature of 30-350C and night
temperature of 20-250C is ideal for proper growth and for tuberation
18-200C is ideal. High night temperature is hazardous &
sometimes if temperature is above 290C tubers are not formed.
Soil and soil
preparation:
Potato
can be grown on a wide variety of soil from lights and fairly heavy clay loam
and on muck soil. But soil with good aeration drained light textured minerals
soil reaction from pH 5-7 is ideal.
Soil
ploughing and preparation depends upon, soil type, climate, ploughing
instruments, virgin or cultivated land etc. but for effective growth and
development, physical structure of soil as well as weeds, stubbles,
sterilization of soil should be done. Soil preparation generally can be divided
into two parts. First 20-25 cm deep ploughing followed by second ploughing is generally practised. Furrow and
ridges are made as per recommended spacing.
Planting:
A. Seed rate and
spacing:
With
line to line to line spacing of 70 cm and plant to plant spacing 23 cm and with
40 gm. per seed with 4 buds, 2.5 tons seed is required for one hectare in order to
maintain ideal plant population and higher yield.
B. Planting season:
Area
|
Planting
season
|
Harvesting
season
|
Plain
(< 300m)
|
Aswin-
kartik
|
Falgun
|
Mangsir
|
Chaitra
|
|
Hills
(>300m)
|
Bhadra
- mangsir
|
Mangsir-
falgun
|
Poush-falgun
|
Baisakh
- jestha
|
Fertilizers
requirements:
Potato
is usually heavily fertilized since they have a high nutrient requirements and
high gross value per area which makes heavily fertilization. 30 tons of
production removes 150 kg N, 60 kg P & 250 kg K, 90 kg CaO, 30 kg MgO.
Fertilizers
application depends upon soil type, soil fertility, temperature, crop rotation,
irrigation facilities. In general, 20-30 tons FYM, 150-200 kg N, 75-100 kg P,
150-175kg K is recommended.
Time of application:
Full
dose of FYM, phosphorous, potassium and half dose of nitrogen at the time of
field preparation and remaining half dose of nitrogen at earthing time by side
line or point dressing.
Irrigation:
Pre
sowing or pre emergence irrigation than after second irrigation after 30 days
and next irrigation as per necessary.
Moisture
availability should be adequate for proper growth and development of tuber and
sprouting. Low moisture content results for tuberation, poor quality tuber and
poor germination. Production of 1 kg of potato required 300-636kg of water and
more.
Inter- cultural
practices:
A. Weed managements:
Weed
control practice is prime necessary in order to reduce loss due to weeds as
weeds compete with the potato. At early stage of growth when the is small, weed
problem severe, so, 1 hand weeding and hoeing when plant is 10-15 cm. then
small growing weeds are controlled at the time of earthing. Then after the plant can cover the weeds and
disorganized the effects of weeds. If necessary, next hand weeding can be done.
Chemically,
weeds can be control by the application of lasso @ 3 ltr/hac as pre- emergence
or post-emergence or a pre- emergence spray of a dinitro compound + diesel oil
in the water or sodiumpentochloropenate +diesel oil in water.
B. Earthing:
In
order to protect growing tubers from radiation, hot, insect, late blight etc.
Plant is covered with soil to some extent depending upon the depth of sowing or
planting. If sown to great depth, size of small ridge is enough. Earthing is
done when plant is 15-20cm tall at proper moisture level.
Harvesting:
When
the plants are turned yellowish & drying, potato is harvested. Before 7-10
days of harvesting, plants are topped at its base or stopped irrigating before
10-15 days of harvesting which helps to mature the coat of potato. Potato is harvested with the help of khurpi
by destroying the ridges side by side.
Yield:
With
the modern improved cultivation practices, 350-500 quintals of potatoes can be
produced.
Grading:
Rotted
& damaged tubers are assorted. According to the market necessity, they are
graded. Grading is done according to their size, like big, medium & small.
For grading iron mesh wire with varying size are used.
Post-harvest
management:
After
harvesting & grading, tubers are surface dried & kept in shade in heaps
for 10-15 days. If the produce is to be marketed early to take benefit of high
market price, it is advisable to harvest potato in stage because of high
perishable nature of immature tubers.
Various points for
seed plot technique of potato under plains:
In
order to obtain healthy & high yielding seeds, we have to focus on the
following points;
·
Use
of healthy & disease free seeds.
·
Timely
sowing (end of Oct.).
·
Use
of 3/4th dose of nitrogen.
·
Use
of the whole tuber seeds.
·
Use
of insecticides (Rogar).
Critical limit- 20
aphids per 100 compound leaves.
·
Hand
cutting (3rd week of January).
·
2
weeks onward of hand cutting harvesting is to be done.
·
Sorting
& tuber treatment (3% Boric acid for 30mins.).
·
Bagging
& storage.
True potato seeds
(TPS):
The
non-availability of good quality seed tuber, high seed cost, virus infiltration
in seed tubers causing degeneration of seed stocks & problem of long
distance transport of seeds from seed producing areas have led to the development
of TPS technology of crop production.
Following
considerations have to be taken for TPS technology:
·
TPS
has to be sown in nursery beds to produce seedlings. The best substrate for
nursery beds is a mixture of 1:1 FYM & soil.
·
TPS
germinates well when night temperature drop to about 20oC in the
plains & shade is provided over nursery bed areas during day time. In
plains the best sowing time is October.
·
The
seedlings raised in nursery can either be transplanted in field to produce a
ware/seed crop alternatively allowed to tuberize in the nursery beds produce
small seedling tubers which can be used for field planting next year.
·
The
method of raising the crop using small seedlings tubers produce in nursery bed
is successful in all the potato growing regions of the country.
·
The
raised seedlings for planting in 1ha, about 100gm TPS is required to be thinly
sown in 50sq. meter nursery bed areas at 10cm, into row distance seedlings will
be ready for transplanting in field in about 20-25 days of germination.
·
For
producing seedlings tubers for planting 1ha in the following crop season, 40gm
TPS is required to be sown in the nursery at 10cm X 10cm inter & intra row
spacing. The haulms may be cut on the dates recommended for the seed crop in
the area.
·
The
ware crop from seedling tubers can be raised following the standard agronomic
practices of the area, keeping in view that smaller tubers are to be planted at
closer spacing. The suitable inter & intra row spacing are 60cm X 20cm for
20-30mm, 60cm X 15cm for 20-25mm, 60cm X 10cm for 15-20mm & 60cm X 5cm for
15mm sized tubers.
·
The
field produce can be used as seed for at least for2 seasons in potatoes
seed producing areas & for 1 season in other areas.
TPS varieties (white
varieties):
·
HPS-1/13
·
TPS/C-3
·
92-PT-27
Varieties recommended
in Nepal:
1. KufriJyoti:
·
Medium
(110-120 days in hills, 100-110 days in mid hills).
·
Resistant
to late blight, size large oval shaped, skin white smooth.
·
6
weeks dormancy period.
·
Yield
20-25tons/ha
2. KufriSinduri:
·
Late
(110-130 days), size medium, round shape, skin red smooth
·
Dormancy
period 8 weeks or more.
·
Yield
25-30 tons/ha, moderately resistant to early blight.
3. Dejire;
·
Medium
sized, shape oval, smooth, red color skin.
·
Early
(70-90 days), susceptible to blight.
4. JanakDev:
·
Medium
to large size, color red.
·
Medium
(100-120 days) can be grown in terai mid hill and high hill.
·
Dormancy
period 6-8 weeks, yield 23 tons.
5. khumal seto-1:
·
Round
shape, both small and large size, skin colour white.
·
Medium
(100-120days), yield 25.1 ton/ha.
·
Dormancy
period 6-8 days, resistant to viral diseases.
6. khumal rato-2:
·
Medium
size, round shape, smooth skin, light red colour.
·
Yield
20-25 ton/ha, resistant to Y-virus.
·
Medium
variety (100-120 days).
7. Kufribahar:
Medium maturity, size large, shape round,
oval, skin white, susceptible to all major diseases.
Following are some other commercial varieties of potato recommended in Nepal
8. Kufrilalima
9. Kufrichandramukhi
10. Local red round
11. Magnum bonum
12Up-to-date
13. T-0012
14. NPI-106
15. Cardinal
Recommended varieties
in different ecological zones of Nepal:
Varieties
|
Recommended zones
|
1.
Cardinal
|
Terai,
valley and mid hills
|
2.
NPI-106
|
Mid
and high hills
|
3.
NPIT/0012
|
Mid
and high hills
|
4.
Kufribadhshah
|
Terai
|
5.
Sarkariseto
|
Eastern
hills
|
6.
Tharu local
|
Mid
and western terai
|
7.
Jumli local
|
Western
terai
|
8.
Kathmandu local
|
Kathmandu
valley
|
9.
CFM-69.1
|
Mid
and high hills
|
10.
I-1124
|
Mid
and high hills
|
Diseases:
Fungal diseases:
- 1. Late blight:
C.O. Phytopthora infestans
Symptoms:
·
Appearance
of water soaked areas which enlarges rapidly and then turn brown or black as
the leaf dies.
·
White
downy mildew sometimes on the lower side of the leaves.
·
The
late blight produces a dry rot.
Control:
·
Spray
Bordeaux mixture at interval of 6-10 days.
·
Spray
Diathene M-45
·
Use
resistant varieties.
- 2. Early blight:
C.O.Altrnaria solani
Symptoms:
Initially brown spots
and increase in size with concentric rings.
Control:
Spray Diathane M-45
(0.2%)
- 3 Stem canker:
C.O. Cerospora solani-tuberosis
Symptoms:
Similar to early
blight but white appearance in the spot.
Control:
Spray Diathane M-45
(0.2%)
- 4 Dry rot:
C.O. Fusarium caerulium
Symptoms:
Fungal growth in
eyes, lenticels and wounds.
Control:
Prevent the injury
and use of free seeds.
Bacterial diseases:
1 1) C.O. Pseudomonas solanacearum
Symptoms:
·
Brown
ring is observed in the stem.
·
Black
appearance of the potato eye.
Control:
Crop
rotation in 2-3 years and proper irrigation.\
2 2) Soft rot:
C.O. Erwinia cartovora
Symptoms:
Bacteria enter into
the tubers through the lenticels.
Control:
·
Proper
irrigation.
·
Storage
after treatment of drugs with exposure to air for an hour.
3 3) Common scab:
C.O. Streptomyces scabies
Symptoms:
Corky spots vary in
size and number from a few small dots to large lesions.
Control:
Disinfect tubers with
Agallol-6 or Mercuric fungicides.
Viral diseases:
- Leaf roll: leaf rolls and thickened.
II. Mild mosaic: light coloration in
leaf vein and mixed with dark green.
III.
Severe mosaic: stunted growth,
uneven appearance of stem and scarp appearance on the leaf.
Insects/pests:
1) Cut worms: spray Dursban-20 EC or apply phorate in soil.
2) Caterpillar: spray Thiodan or BHC (10%)
c 3) Aphid: spray rogar or malathion.
4) Jassids: Spray metasystox (0.8%).
Physiological
Disorders:
a 1) Internal brown spots:
It is characterized
by irregular, dry brown spots scattered through the flesh of tuber due to
irregular irrigation.
2) Black heart:
When potato are
stored high temperature of 35-40oC they develop black heart in which
inner tissues break down and become black which may be due to lack of oxygen,
accumulation of CO2 and high temperature.
c 3) Hollow heart:
It is characterized
by irregular cavity in the center of tuber. Surrounding the cavity, there is no
decay or discoloration. It is produced in large sized tuber variety which can
be overcome by closure spacing and avoiding excessive use of fertilizers.
4) Chilling injury:
It is due to storage
of tubers for long time at temperature of about 00C. This result in discolor
blotches in the flesh of tubers which vary from light reddish brown to dark
brown.
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