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From Wikipedia, the free encyclopedia

Blight refers to a specific symptom affecting plants in response to infection by a pathogenic organism. It is simply a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs.[1] Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are:

On leaf tissue, symptoms of blight are the initial appearance of lesions which rapidly engulf surrounding tissue. However, leaf spot may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms.

References

  1. ^ Agrios, George N. Plant Pathology. 5th ed. Burlington, MA: Elsevier Academic Press, 2005.
  2. ^ Oda, M., Sekizawa, Y., and Watanabe, T. 1966. "Phenazines as Disinfectants Against Bacterial Leaf Blight of the Rice Plant." Applied Microbiology 14(3):365-367.

Source material

Up to date as of January 22, 2010

From Wikisource

Blight
by Ralph Waldo Emerson
Published in Poems (1847)


Blight

Give me truths;
For I am weary of the surfaces,
And die of inanition. If I knew
Only the herbs and simples of the wood,
Rue, cinquefoil, gill, vervain, and agrimony,
Blue-vetch, and trillium, hawkweed, sassafras,
Milkweeds, and murky brakes, quaint pipes, and
    sundew,
And rare and virtuous roots, which in these woods
Draw untold juices from the common earth,
Untold, unknown, and I could surely spell
Their fragrance, and their chemistry apply
By sweet affinities to human flesh,
Driving the foe and stabling the friend,—
O, that were much, and I could be a part
Of the round day, related to the sun
And planted world, and full executor
Of their imperfect functions.
But these young scholars, who invade our hills,
Bold as the engineer who fells the wood,
And travelling often in the cut he males,
Love not the flower they pluck, and know it not,
And all their botany is Latin names.
The old men studied magic in the flowers,
And human fortunes in astronomy,
And an omnipotence in chemistry,
Preferring things to names, for these were men,
were unitarians of the united world,
And, wheresoever their clear eye-beams fell,
They caught the footsteps of the same. Our eyes
Are armed, but we are strangers to the stars,
And strangers to the mystic beast and bird,
And strangers to the plant and to the mine.
The injured elements say, 'Not in us';
And night and day, ocean and continent,
Fire, plant, and mineral say, 'Not in us,'
And haughtily return us stare for stare.
For we invade them impiously for gain;
We devastate them unreligiously,
And coldly ask their pottage, not their love.
Therefore they shove us from them, yield to us
Only what to our gripping toil is due;
But the sweet affluence of love and song,
The rich results of the divine consents
Of man and earth, of world beloved and lover,
The nectar and ambrosia, are withheld;
And in the midst of spoils and slaves, we thieves
And pirates of the universe, shut out
Daily to a more thin and outward rind,
Turn pale and starve. Therefore, to our sick eyes,
The stunted trees look sick, the summer short,
Clouds shade the sun, which will not tan our hay,
And nothing thrives to reach its natural term;
And life, shorn of its venerable length,
Even at its greatest space is a defeat,
And dies in anger that it was a dupe;
And, in its highest noon and wantonness,
Is early frugal, like a beggar's child;
Even in the hot pursuit of the best aims
And prizes of ambition, checks its hand,
Like Alpine cataracts frozen as they leaped,
Chilled with a miserly comparison
Of the toy's purchase with the length of life.

PD-icon.svg This work published before January 1, 1923 is in the public domain worldwide because the author died at least 100 years ago.
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