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002   control options for rice bacterial panicle blight, don groth
 

002 control options for rice bacterial panicle blight, don groth

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  • This disease also takes place in China. There is almost no research on it and even thought it was a disease caused by fungus Altalaria. This presenation is very helpfu to me.
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    002   control options for rice bacterial panicle blight, don groth 002 control options for rice bacterial panicle blight, don groth Presentation Transcript

    • Control Options for Rice C t l O ti f Ri Bacterial Panicle Blight Groth D E 1, Rush M C 2, Shahjahan A K M 2, Groth, D.E. Rush, M.C. Shahjahan, A.K.M. Sha, X.1, and Ham, J. 2 LSU AgCenter, 1Rice Research Station, Rayne, LA and 2Department of Plant Pathology and Crop Physiology, Baton Rouge, Ro ge LA USA
    • Major Rice Diseases
    • Bacterial Panicle Blight
    • Areas of research Etiology Epidemiology Cultural C lt l management t Foliar pesticides Seed treatments Disease resistance
    • Etiology Isolation by plant inoculation Bacterial species as determined by BioLog Burkholderia glumae most prevalent Others identified – B. B gladioli – B. cepacea – B. pyrrpcinia py p Development of a real-time PCR to identify B. real- glumae and B. gladioli in green tissues
    • Isolation and identification
    • Epidemiology B. gladioli found surviving in soil but not B. glumae Spread of epiphytic populations limited during growing season 38 and 40°C for optimum for bacteria 40°
    • Cultural management Nitrogen management – Higher N rate more disease Planting date – Late planted rice more disease Exposed to higher temperatures
    • Foliar Applications Antibiotics Coppers Oxolinic A id O li i Acid Micro nutrient mixtures Growth regulators
    • Tested Products In-vitro In-
    • Foliar Trials Applied between boot and heading Various rates ex. Starner 0.35-0.50 lb ai/A 0.35- ai/A Inoculated and uninoculated t i l I l t d d i l t d trials Coppers tend to be toxic Antibiotics were not very effective Oxolinic acid (Starner 20WP) best
    • Difficulties with foliar applications No prediction or scouting methods Erratic occurrence Regulatory problems R l t bl Cost of preventative sprays Toxicity of coppers Increased yields and milling erratic No h i l N chemical control i th near f t t l in the future
    • Scouting and Determining Need Damage is most severe during periods of unusually hot weather or unusually hot nights. No y y g scouting methods are available and no chemical control agents are labeled to control bacterial panicle blight.
    • Seed treatments Materials tested – Coppers fungicides – Antibiotics – Oxolinic acid Development of ELISA and PCR t t f D l t f d tests for identifying infected seed-lots seed- Seed treatments erratic
    • Disease resistance Screening methods – Inoculation at boot split and heading – Bacterial concentration critical ~1x108 CFU/ml – Too high all susceptible – Too low all are resistant – Isolate must produce toxin
    • Inoculation timing - 2 times
    • Rating scale (0-9) (0- 0 no damage (Immune) 3 20-30% damage (moderately resistance) 20- 6 50-60% damage (susceptible) 50- 9 100% sterility ( t ilit (very susceptible) tibl ) 2 vs 8
    • Disease resistance cont. Host resistance – High levels of resistance found (1-3 ratings) (1- Nipponbare, LM-1, Jupiter, TeQing, AB647, others LM- – Crosses made and populations being evaluated – Evaluating 6000-8000 inoculated rows/year 6000- – Evaluate whenever natural disease develops p – Screen F3 to F8
    • Panicle Blight Reactions Very Moderately Moderately Susceptible Susceptible Susceptible Resistant CL131 CL161 Catahoula Jupiter Bengal g Cheniere Hybrids y Trenasse Cocodrie Neptune CL151 Wells CL171
    • 10 BPB resistant lines, including source varieties, germplasm, and breeding lines, are available by request LM-1 NPB/CCDR Nipponbare LM‐1/CCDR Jup te Jupiter LR2065/CCDR / LM‐1/CCDR CCDR/LR2065 NBP(MCR00‐2190 C93‐137  NBP(MCR00 2190 C93 137 LR2065/CCDR KATY/CPRS/JA85)
    • Summary Cultural management ineffective Chemical control unlikely Disease resistance main area of effort Some progress towards developing diseases resistance including four sources Request seed from: Don Groth Rice Research Station 1373 Caffey Road Rayne, Rayne LA 70578 USA dgroth@agcenter.lsu.edu