Louisiana Rice: No Reports of Blast This Year

    Disease Update

    I have not had any reports of blast so far this year – another good start. The cold winter has destroyed most of the overwintering rice plants and stopped the pathogens from actively growing and sporulating on them.

    I also checked several very susceptible varieties in my disease nurseries and did not find any blast lesions. Time will tell, but I am optimistic.

    Most of the seed and seedling disease problems should be over by now. The cool weather has delayed the development of the crop, thus delaying stem and foliar disease development. As more fields are sprayed, fertilized and flooded, the rice will start to develop rapidly, producing thicker canopies.

    These thick canopies, along with the rainfall we should be receiving, will maintain moisture as dew and leaf wetness for longer periods providing a favorable environment for disease development. Disease development will be less likely if the weather continues dry. Keep track of the weather patterns in your area because conditions can vary greatly over even short distances.

    Rice plants will also become more susceptible to blast as they approach tillering.

    If the pathogen is present on a susceptible variety and weather is favorable, the disease triangle will be complete, and disease development is likely. Start scouting soon to detect blast and sheath blight, especially in fields planted with susceptible and very susceptible varieties.

    Generics

    The patent on azoxystrobin (Quadris, Quilt and Quilt Excel) expired this year. As when the propiconazole (Tilt, Quilt and Quilt Excel) patent expired, generic or new fungicides will be available this year with the same active ingredient. The formulations should be the same and the activity will be very similar if not identical.

    The important fact to remember is there may be new fungicide available, but they do the same thing as the original. If you have strobilurin-resistant Rhizoctonia solani, they will be resistant to these new strobilurin fungicides. Check the label and see what the mode of action is.

    Sercadis

    I just heard that BASF has announced a significant price reduction for Sercadis. Check with your local dealer for actual prices. This will make Sercadis more competitive with other rice fungicides.

    There is a misunderstanding about Sercadis use with the resistant sheath blight pathogen. The best time to use an alternate mode of action fungicide like Sercadis or Moncut is before resistance develops.

    Alternating fungicide modes of action or tank mixing them should delay or prevent resistance from developing. Once strobilurin resistance develops, you have to use either Sercadis or Moncut to control sheath blight. Let’s be proactive rather than reactive in dealing with the sheath blight pathogen resistance. Alternating fungicide modes of action will also help prevent resistance to Sercadis and Moncut, which is possible.




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