ECO-FRIENDLY MANAGEMENT OF WHEAT POWDERY MILDEW CAUSED BY Blumeria graminis tritici.
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Date
2019-07
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CSKHPKV, Palampur
Abstract
The present investigation entitled “Eco-friendly management of wheat powdery mildew caused by Blumeria graminis tritici” was undertaken to identify resistant sources, study pathogenic variation and the disease management using plant extracts and organic formulations. Out of 2023 genotypes, seventeen genotypes were free from disease at seedling and adult plant stage at Palampur and Malan during 2017-18 and 2018-19. Pathogenic variation was studied in 20 ascosporic isolates collected from Dalang Maidan (Lahaul & Spiti) during September-October, 2018, on a differential set comprising of 36 known Pm genes. Based on the differential reaction, the isolates were grouped into 20 pathotypes. The most virulent pathotype was 20 attacking 22 resistant genes whereas, pathotype 2 was the least virulent as it showed susceptible reaction on 12 genes i.e. Sonora (Pm3c), Aristide (Pm3g), Hope (Pm5a), Siete Cerros (Pm5b), Transec (Pm7), Kavkaz (Pm8), Norin (Pm10), Wembley (Pm12), Lr 34 (Pm38), TD114 (Pm2+6), Talent (Pm5+?) and Chancellor. Powdery mildew differential lines with resistance genes WHMN (Pm1c), Near isogenic line (Pm2), Chul (Pm3b) and Maris Dove (Pm2, Mld), were resistant to all isolates of B. graminis f.sp. tritici. Among plant extracts and organic formulations, Azadirachta indica (20%) under in vitro conditions and foliar spray under polyhouse conditions and Calotropis gigantia (15%) under field conditions were found to be the most effective and may be harnessed as a potential alternate to fungicides.
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