WEED FLORA AND
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WEED FLORA AND WEED DISTRIBUTION IN POTATO
Potato is a starchy, tuberous crop from the perennial Solanum tuberosum of the
Solanaceae family (also known as the nightshades).
Potatoes were first introduced outside the Andes region
four centuries ago, and have become an integral part of
much of the world's cuisine. World's fourth-largest food
crop, following rice, wheat and maize.
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WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Weed flora of the experimental field predominantly consisted of
five broad-leaved weed species and one grass weed species.
The weeds present in the experimental field were Spergula
arvensis, Polygonum nepalense, Raphanus raphanistrum, Bidens
pilosa, Galinsoga parviflora under broad leaved weeds and
grasses weed was Pennisetum clandestine.
Broad leaved dominated the weed flora which accounts for about
70-80 per cent followed by grasses.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Spercula arvensis
A common weed in potato field and also called as
corn spurrey, belongs to the family Caryophyllaceae.
It is annual seed-propagated weed. Cotyledons are very
slender, linearly needle-shaped, standing diagonally
upward. Foliage leaves are linearly awl-shaped , 2-3 cm
long, sticky haired, in whorled tufts. Stems are erect or
ascending in groups or prostrate, jointly articulated, up to
40 cm high or long. Number of seeds per plant are from
1000-10,000.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Boll is wide ovate, opens with 5 folds or does not open. Seeds are
small,1-1.8 mm in diameter, black, with narrow brownish margin.
Germination period is spring, seed germination depth is 0.5-3 cm.
Flowering period is summer-autumn.
Number of seeds per plant are from 1000-10,000.
It is widely spread in Western Europe, Northern Africa, Northern
America, China, India and Japan. Infests all crops, occurs in kitchen
gardens, fallow lands, along roadways, near habitation.
Weed is stable under average agriculture conditions only.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Polygonum nepalense (Nepalese smartweed) is a annual belongs to
the family polygonaceae. Polygonum nepalense can grow in semi or
areas with no shade.
Polygonum nepalense
Usually common in damp shaded situations, 1700 - 2000m
in Srinagar. Stems decumbent or ascending, 20-40 cm tall.
Lower leaves petiolate; petiole 2-3 cm, winged, leaf blade
ovate or triangular.
Capitate type inflorescence ,peduncle long, glandular hairy;
margin membranous. Pedicels shorter than bracts.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Fruiting type is achenes. Tender young leaves are short - raw or cooked as a vegetable.
A paste of the root is used as a poultice on fresh
wounds Germination is usually free and easy.
A juice of the root is used in the treatment of fevers.
The squeezed plant is used for washing clothes.Plants used directly as a soap substitute.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Raphanus raphanistrum is a annual belongs to the
family Brassicaceae. It is an annual and biennial,
leaves are alternate. Very often pinnately incised and
do not have stipules.
Raphanus raphanistrum
They have four free saccate sepals and four clawed free petals, staggered ,six
stamens, four of which are longer (as long as the petals, so relatively short in fact)
and are arranged in a cross like the petals and the other two are shorter
(tetradynamous flower).
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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The pistil is made up of two fused carpels and the style is very short, with two lobes. Superior ovary. Racemose type of inflorescences, often apically corymb-like.
Pollination occurs by entomogamy, nectar is
produced at the base of the stamens and stored on
the sepals.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Bidens pilosa (Cobbler’s pegs)
It is a annual herb belongs to the family Asteraceae
(Compositae) commonly known as Spanish Needle.
This plant is considered a weed in some tropical habitats.
However, in some parts of the world it is a source of food or
medicine.
For example, in sub-Saharan Africa, the tender shoots and
young leaves are used fresh or dried as a leaf vegetable,
particularly in times of scarcity weak annual herb usually a
metre or less in height, with spreading branches
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Each head has five or so white ‘petals’ (rays) around a
dense cluster of orange florets. These rapidly mature
to star-heads of the dry pronged fruitlets.
Leaves are in opposite paris, this, soft and hairy, mostly divided but also
undivided. The flowers (summer-autumn), technically heads of tiny
flowers, terminate all branches and branchlets.
WEED FLORA AND WEED DISTRIBUTION IN POTATO
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Cardamine impatiens
It is a slender, biennial herb produces sterile
leaves.
Cardamine impatiens belonging to Brassicaceae.
Leaves are pinnate with several
pairs of lanceolate.
The seeds are arranged in one
row on each side of the central
membrane of the narrow pod
and are ejected out in a shower
due to the tension formed as the
seed pod (silique) dries.
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The fruit is a peculiar kind of capsule named siliqua.
Most members share a suite of glucosinolate compounds that has a typical pungent odour usually associated with cole crops
The siliqua may break apart at constrictions occurring between the segments of the seeds.
Where a siliqua is less than three times as long as it is broad, it is usually termed a silicula