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POSTERS: Integrated Pest Management II

P-306 - Integrate Pest Management of Cercospora Panicle Blight in Rice

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3

    Presenting Author(s)

  • AC

    Anderson Cerutti

    LSU - Louisiana State University
    Rayne, Louisiana, United States

    • Author(s)

  • FD

    Felipe Dalla Lana

    Assistant Professor
    Louisiana State University
    Rayne, Louisiana, United States

Abstract Text: Cercospora, caused by Cercospora janseana, causes significant yield and quality loss in Louisiana. The disease was previously referred to as narrow brown leaf spot (NBLS), but new development on host resistance and management support the separation of the disease based on symptomology. NBLS now refers to the symptoms on the leaf only, while Cercospora Net-Blotch (CNB) refers to the symptoms on the sheath, and Cercospora Panicle Blight (CPB) refers to the symptoms on the panicle. While this disease is endemic to Louisiana, research was previously conducted only on NBLS. This study aims to evaluate the control efficacy for CPB of a combination of fungicide and cultivars with different resistance to NBLS. The experiment was conducted in three environments (ENV), two at Crowley, LA, and one at Lake Arthur, LA. The varieties (GEN): Jupiter, PVL03, CLJ01, DG263L, Cheniere, and CLL19 were selected based on their resistance to NBLS. Fungicide treatments (FUNG), using propiconazole at a rate of 20 g ai/ha, were applied at the early booting (EB) or late booting (LB) stage. CPB Incidence (%) and mean lesion length (cm) were estimated from 50 tillers per plot. Yield (kg/ha) and milling quality as whole grain (%) and total grain (%), were also collected. The experimental design was RCBD with four replications. The incidence of CPB ranged from 35% to 100%, with a median of 91%. The GEN*ENV interaction was significant for all variables (P < 0.001). FUNG had no significant effect on any variable tested (P > 0.05). The results showed the limited effect of FUNG on CPB management.