english unit 6 fix

7/30/2019 English Unit 6 Fix

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The control of weeds and

plant diseaseGroup 6


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MEMBER:

Brilliant Mentari

Indrawan Bayu

Larasati Aisyah

Lusy Theresia

Ria Precillya


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Wheat Weeds

There are several grass and broadleaf weeds that must be controlled for good

plant growth and seed yields.

Some weeds can contaminate the seed at harvest time for processing purposes.

These include wild garlic and wild onion. If they are not controlled with herbicides

the crop could be ruined.


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MAIZE

Disease : smut

Causal organism : fungus Ustilago zeae

Symptoms : Soft tumors on all parts of plant, mostly cob.

Tumors, when mature, split, and release

black dusty mass of spores.

Control measures : Practise crop rotation and sanitation. Or, grow

resistant varieties


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COTTON

Disease : stenosis, or leaf curl

Causal organism : virus

Symptoms : Leaves of affected plant become crinkled and

deformed. Yellow or pink discoloration


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COTTON

Disease : black arm, or angular leaf spot

Cusal organism : bacteria Xanthomonas malvacearum

Symptoms : All above ground parts of plant attacked.

Angular spots on leaves and branches turn

dark brown with reddish margin when old.

Control measures : Treat seed with organo-mercurials before

sowing. Also, destroy all cotton plant debris.


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SUGAR CANE

Disease : red rot

Cusal organism : fungus Colletotrichum falcatum

Symptoms : Leaves wither, cane shrinks. Black specks onshriveled rind. Split cane gives sour smell.

Control measure : Plant clean cuttings dipped in 5% formalin.

Or, grow resistant varieties.


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SWEET POTATOES

Disease : black rot

Causal organism : fungus Ceratostomella funbriata

Symptoms : Tubers attacked, foliage turns yellow and

sickly. Black cankers on portion underground.

Grey-black, circural, depressed spots on

fleshly roots.

Control measure : Treat seed tubers in mercuric chloride

solution, or 2 borax solution. Also, carefully

store seed tubers, and rotate seed-bed.


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GROUNDNUTS

Disease : rosette disease

Causal organism : virus

Symptoms : Circural spots on both sides of leaves. Spots

on upper surface dark brown with yellow halo.

Control measures : Plant seeds early and close. Also, use clean

seed, and uproot and burn infected plants.


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TOMATOES

Disease : bacterial wilt

Causal organism : bacteria Pseudomonas

solanacerum

Symptoms : Lower leaves wilt and

eventually die.


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RICE

Disease : blast

Causal organism : fungus Piricularia oryzae

Symptoms : Brown longitudinal spots on leaves. Spots on

stem and grain darker in colour.

Control measures : Spray with 1% Bordeaux mixture. Also or

grow resistant varieties.


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