The Response of Potato Late Blight to Potato varieties and Fungicide Spraying Frequencies at Meket, Ethiopia

Potato late blight (Phytophthora infestans (Mont.) De Bary) is the major constraint of potato production in Ethiopia. The field experiment was done at Meket district during 2018 cropping season, to determine appropriate spraying frequency combined with different levels resistance variety. had 15 treatments a combination three varieties (Belete, Gudene, and Jalene) five frequencies (zero, one, two, three, four times spray). arranged randomized complete block design factorial replications. Ridomil applications showed statistically significant on disease, yield, yield component parameters. highest disease severity (84.76%) obtained from untreated Jalene maximum tuber (29.62 t ha −1) Belete variety sprayed two-time spraying. Whereas lowest (12.93 ha−1) recorded Moreover, (1774.65%) marginal rate return treated one spray. Finally, it concluded that for moderately spray, susceptible two sprays were found better management options get cost-benefit as compared other treatment combinations.