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

Abstract

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 of resistance variety. The experiment had 15 treatments with a combination of three potato varieties (Belete, Gudene, and Jalene) and five spraying frequencies (zero, one, two, three, and four times spray). The experiment was arranged in a randomized complete block design in factorial combination with three replications. The combination of potato varieties and spraying frequencies of Ridomil applications showed statistically significant on the disease, yield, and yield component parameters. The highest disease severity (84.76%) was obtained from untreated Jalene variety. The maximum tuber yield (29.62 t ha −1) was obtained from Belete variety sprayed with two-time spraying. Whereas the lowest tuber yield (12.93 t ha −1) was recorded from untreated Jalene variety. Moreover, the highest (1774.65%) marginal rate of return was obtained from Belete variety treated with one spray. Finally, it is concluded that for moderately resistance one spray, moderately susceptible two sprays and four sprays for susceptible varieties were found better management options and get the highest costbenefit as compared with other treatment combinations.

Enhancing Production of Potato (Solanum tuberosum L.): Evidence from Demonstration and Participatory Evaluation of Improved Potatoes in Kellam and West Wollega Zones

“…The local variety with improved management practices gave 22.2ton ha -1 . This is in line with the study of (Tessema et al, 2020;Jafar et al, 2020;Alo and Geremew, 2021;Hailu et al, 2020;Kassaw et al, 2021;Alo and Geremew, 2021b;Befikadu et al, 2019) which reported Belete superiority over other varieties. The yield of Belete was 26% lower of its potential yield (figure 1).…”

“…Generally, farmers preferred and ranked Belete variety first with the total percentage of 42.32%, Gudane and Local second and third with total percentage of 38.62% and 19.05% respectively. Similarly, Belete variety was selected first for its tolerance to disease, higher yield over other six varieties demonstrated in Amhara region (Asresie et al 2015) and Gudane was selected as the good cooking quality by the study conducted by Hailu et al, 2020. Kassaw et al, 2021 The net benefit that was gained from producing Belete variety was higher than the one that obtained from producing Gudane and local.…”

Effectiveness of slow‐release fungicide formulations for suppressing potato pathogens

“…Therefore, it is difficult to discuss the results obtained. At the same time, the choice of the fungicides studied in this work is justified, since azoxystrobin, mefenoxam (metalaxyl), and difenoconazole are widely used in crop production for treating tubers before planting and for spraying potato plants 56–61 . The antifungal activity of the standard formulations, containing azoxystrobin+mefenoxam formulation, combining two fungicides, which was used in the positive control, was comparable to the antifungal activity of the embedded fungicides.…”

“…At the same time, the choice of the fungicides studied in this work is justified, since azoxystrobin, mefenoxam (metalaxyl), and difenoconazole are widely used in crop production for treating tubers before planting and for spraying potato plants. [56][57][58][59][60][61] The antifungal activity of the standard formulations, containing azoxystrobin+mefenoxam formulation, combining two fungicides, which was used in the positive control, was comparable to the antifungal activity of the embedded fungicides. This is consistent with the literature data showing the effectiveness of this formulation for pre-sowing soil treatment and suppression of Pythium rot, black scurf, black dot, and silver scurf, which improved the growth and yield of potatoes.…”

Revisiting innovation practices in subsistence farming: the net effects of land management, pesticide, herbicide and fungicide practices on expected crop harvest in Ethiopia

“…To offset such outcomes, fungicides are also leveraged in the production of garlic (Endalew et al, 2020) and sugarcane in Ethiopia (Kecha, 2020). Relatedly, Kassaw et al (2021) indicate that greater yields accrue from the use of fungicide in Ethiopian potato plantations. In fact, there is no shortage of theoretical links between fungicide use and improved farm harvests (Danso-Abbeam and Baiyegunhi, 2017).…”