diseases of cottoncotton.tamu.edu/nematodes/diseases of cotton (south texas).pdfseedling diseases -...
TRANSCRIPT
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Diseases of Cotton
Thomas IsakeitCooperative Extension, The Texas
A&M University System
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SEEDLING DISEASES
- PRE-EMERGENCE DAMPING-OFF
- POST-EMERGENCE DAMPING-OFF
- SORESHIN
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POSTEMERGENCE DAMPING OFF
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SEEDLING DISEASE
SORESHIN AND DECAY CAUSED BY RHIZOCOTONIA SOLANI
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SEEDLING DISEASE
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THE BEST MANAGEMENT FOR SEEDLING DISEASE:
WAIT UNTIL SOIL TEMPERATURE IS 65o F.
BEFORE PLANTING
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WHARTON: SOIL TEMPERATURE
50556065707580
2/29 3/
7
3/14
3/21
3/28 4/
4
4/11
4/18
DATE
TEM
PERA
TUR
E ( o F)
3” - AVERAGE OF SIX YEARS
65 oF: SOIL TEMPERATURE FOR PLANTING
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FUNGICIDE SEED TREATMENT
RIGHT SIDE: NO TREATMENT, DAMPING-OFF
LEFT SIDE: FUNGICIDE-TREATED SEED
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COTTON SEEDLING DISEASE
SEED TREATMENTS ALONE MAY NOT BE ENOUGH WHEN DISEASE PRESSURE IS HIGH BECAUSE OF:
- LARGE AMOUNT OF RESIDUE
- COOL, WET WEATHER
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COTTON SEEDLING DISEASE
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COTTON SEEDLING DISEASE
INCREASED IN THE PRESENCE OF FRESHLY-KILLED COVER CROP
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IN-FURROW FUNGICIDE APPLICATION:
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IN-FURROW FUNGICIDE APPLICATION:
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FOR MORE INFORMATION:
Http://ipm.tamu.edu/crops/pubs/seedling_diseases.html
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
AERIAL PHOTO OF COTTON FIELD ON CENTER PIVOT IRRIGATION, TAKEN WITH INFRARED FILM, SHOWING THE CIRCULAR PATTERN (DARK AREAS) OF DISEASE DEVELOPMENT.
PHOTO COURTESY OF CARLOS FERNANDEZ
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
WILTED PLANT FLANKED BY TWO DEAD PLANTS
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
AN EARLY SYMPTOM ASSOCIATED WITH THE INITIALWILT IS THE PRESENCE OF WHITE MYCELIA ON THE LOWER STEM
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
DISTINCTIVE CRUCIFORM BRANCHING OF HYPHAE
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
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PHYMATOTRICHOPSIS (COTTON) ROOT ROT:
STRANDS OF THE FUNGUS (LEFT PHOTO) AND SCLEROTIA OF THE FUNGUS (RIGHT PHOTO) IN SOIL. PHOTOS COURTESY OF CHARLES KENNERLEY
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RENIFORM NEMATODE:
PHOTO CREDIT:
D.C. NORTON
THREE FEMALES ATTACHED TO A SMALL ROOT
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RENIFORM NEMATODE:
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RENIFORM NEMATODE:
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RENIFORM NEMATODE:
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RENIFORM NEMATODE:
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RENIFORM NEMATODE:
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RENIFORM NEMATODE:
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RENIFORM NEMATODE SAMPLING:
2 & 5: AREA OF POOR GROWTH
9: OTHER SOIL TYPE20-30 CORES FROM 10 ACRE BLOCK
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RENIFORM NEMATODE:
POPULATION THRESHOLDS
PREPLANT: 1,000 JUVENILES/PINT
FALL SAMPLE: 5,000 JUVENILES AND ADULTS / PINT
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RENIFORM NEMATODE:
CONTROL* PREVENT NEW INFESTATIONS BY CLEANING EQUIPMENT
* 1- OR 2-YEAR ROTATION WITH CORN, SORGHUM, RICE, RESISTANT SOYBEAN VARIETIES
* WEED-FREE FALLOW
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RENIFORM NEMATODE:
TEMIK OR TELONE LIMITATIONS* HOLD POPULATIONS DOWN FOR
SIX WEEKS ONLY
* CHEMICALS HAVE LIMITED MOVEMENT IN HEAVY SOILS
* NEMATODES CAN BE FOUND SEVERAL FEET DEEP
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PREMATURE DEFOLIATION:
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PREMATURE DEFOLIATION:
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PREMATURE DEFOLIATION:
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PREMATURE DEFOLIATION:
* CAUSE IS NOT KNOWN
* WIDESPREAD, MANY VARIETIES
* FOLIAR PATHOGENS: MINOR
* K DEFICIENCY? - WATER IMBALANCE- STRESS OF FRUIT LOAD
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FUSARIUM WILT:
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FUSARIUM WILT:
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FUSARIUM WILT:
VASCULAR DISCOLORATION SEEN WHEN STEM IS CUT
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ROOT KNOT NEMATODE:
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ROOT KNOT NEMATODE:
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ROOT KNOT NEMATODE:
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SOUTHWESTERN COTTON RUST:
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SOUTHWESTERN COTTON RUST:
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RUST ON GRAMA GRASS:
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RUST ON GRAMA GRASS:
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VERTICILLIUM WILT:
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VERTICILLIUM WILT:
VASCULAR DISCOLORATION SEEN WITH CUT STEM
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PHYTMATOTRICHOPSIS VS. VERTICILLIUM:
PHYMATOTRICHOPSIS ROOT ROT
VERTICILLIUM WILT
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BACTERIAL BLIGHT:
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BACTERIAL BLIGHT:
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BACTERIAL BLIGHT:
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BACTERIAL BLIGHT:
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BACTERIAL BLIGHT: