Decoding Antixenotic Mechanism of Resistance in Cassava Genotypes against Whitefly, <i>Bemisia tabaci</i> (Gennadius)

Abstract

Screening 375 cassava genotypes at Tapioca and Castor Research Station, Salem, India against whitefly, Bemisia tabaci (Gennadius) revealed eight highly resistant genotypes namely, Me 743, Me 650, Me 637, Me 739, Me 148, Me 874, Me 25, and Me 707, maintaining fewer than 20 insects/plant across crucial growth stages (3-6 months after planting). Trichome analysis revealed prevalent non-glandular, simple, single-celled elongated or irregular-shaped structures. Correlation studies between whitefly incidence and trichome density indicated a positive relationship (0.39) without statistical significance, emphasizing the role of trichomes in conferring resistance. India’s cassava genetic diversity holds significant promise in the creation of resistant variety.