Pathogenicity of Sclerotium rolfsii Sacc. to several varieties of peanut on various dosages of dolomite in peatland

Stem rot disease caused by Sclerotium rolfsii Sacc. and soil acidity are the two problems that need to be addressed on peanut cultivation in peatland. Dolomite addition not only reduces soil acidity but also affect fungal pathogenicity. To study this, we used split plot design with dolomite dosages of 0, 10, and 20 t ha-1as the main plots, and peanut varieties viz.Hypoma-1, Hypoma-2, Jerapah, Talam-1, Talam-2, Talam-3, Bison, and Takar-2as the subplots.Three replications were used for these combinations. Dolomite dosagesandpeanut varieties interacted significantly onthe pathogenicity of S. rolfsii at 15 DAIand filled pod percentage. The highest pathogenicity(30%)was found in Takar-2-20t ha-1dolomite, while the lowest pathogenicity (1%)was foundon Hypoma-2-0t ha-1dolomite. The highest percentage of filled pods was on Bison-10t ha-1dolomite(79%),and the lowest was on Takar-2-0 t ha-1dolomite(29%). Singly, the highestpathogenicity of S. rolfsiiwas found on Takar-2, while Hypoma-2, Jerapah, Talam-2, Talam-3& Bison were more resistant. Dolomite dosage singly was only affecting the growth and the percentage of filled pods. The highest filled pods were on 10 tha-1dolomite, however if theincrease to 20 tha-1dolomite had insignificant effectto enhance filled pods. These results indicated that resistant-high-yielding variety of peanut is most likely to survive stem disease and being productive in peatland enriched with proper amount of dolomite.