International Journal of Horticulture, 2024, Vol.14, No.6, 333-342 http://hortherbpublisher.com/index.php/ijh 340 Table 9 Grading tubers of potato varieties on weight basis at Myagdi, Nepal (2022) Treatments Less than 25 g Between 25 g and 50 g Greater than 50 g T1 (Desiree) 16.84bc 170.84 202.70bc T2 (Janakdev) 20.94ab 180.19 311.60a T3 (Kufri Jyoti) 16.76bc 194.03 205.30bc T4 (Mustang local) 22.92a 147.08 152.43c T5 (Khibang local) 15.81c 158.03 246.44ab LSD(=0.05) 4.57 49.58 78.91 SEm(±) 0.74 8.05 12.81 CV% 15.90 18.92 22.90 F probability 4.36* ns 5.38* Grandmean 18.65 170.08 223.69 Note: Mean followed by common letter(s) within columns are non-significantly different based on LSD test P=0.05, *Significant at 0.05Plevel, SEm(±) d; Standard Error of mean difference, CV: Coefficient of Variation 3.10 Disease severity and incidence In evaluating the resistance of potato varieties to wart disease caused by Synchytrium endobioticum, the EPPO diagnostic standard (EPPO, 2004) was employed, and field trials were conducted on five different varieties. The results showed significant differences in disease severity and incidence among the varieties (Table 10). Among them, Janakdev and Desiree demonstrated strong resistance, with a disease severity rating of 1 and no observed disease occurrence (0% incidence). In contrast, the Seto aalu variety from the Myagdi region exhibited extremely high susceptibility, with a disease severity rating of 9 and an incidence rate of 98%, indicating that nearly all tubers were affected. The Rato aalu (Figure 4) and Mustang local varieties showed moderate resistance, with incidence rates of 3% and 20%, respectively. These results indicate that Seto aalu is highly susceptible to wart disease, while Janakdev and Desiree show strong resistance under field conditions. Table 10 Wart formation in potato tubers (Type I-X, Spieckermann Scale) in Synchytrium endobioticum-infested fields, Myagdi, Nepal Treatments Disease rating in the field test (Scale 1-9) Disease incidence T1 (Janakdev) 1 0% T2 (Desiree) 1 0% T3 (Kufri Jyoti) 2 2% T4 (Myagdi local (Seto aalu)) 9 98% T4 (Myagdi local (Rato aalu)) 2 3% T5 (Mustang local) 3 20% Note: Scale as described in EPPO Diagnostic protocol (EPPO, 2004). 1: tubers not affected; 9: very large warts, no normal tubers present (see ‘Materials and Methods’) Figure 4 Potato wart free Myagdi local (Rato aalu)
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