# Protection of Oats against _Puccinia_ and _Drechslera_ Fungi in Various Meteorological Conditions
## 3 Results
In 2015, the weather conditions for the development of oats plants were moderately unfavorable (IV-VII months). The value of the Sielianinow coefficient ranged from 0.7 to 1.6 (dry-slightly humid). The weather conditions during the season were characterized by a high amount of rainfall during the sowing period--a Sielianinow coefficient of 2.8. The rainfall deficiency occurring in the period from April to June was unfavorable for the development of the pathogen. The average level of infection of the control objects for the analyzed varieties was measured at 7.27%. The amount of infection on the leaves of oat plants from control objects in 2016 was 5.13-8.50%. The highest control efficiency was achieved after the use of tebuconazole and epoxiconazole, at 95.1% in the Arab variety and 90.6% in the Maczo variety, respectively. The use of triazoles reduced paralysis by 59.1-95.1%, while strobilurins did so by 45.5-86.8%. In the Arab and Breton cultivars, after the application of picoxystrobin, no statistically significant differences were found compared to the control objects. The highest effectiveness was recorded in the case of the Bingo variety, which, after all fungicides were applied, ranged from 78.7 to 89.7%. In 2016, the weather conditions for the development of oats plants were extremely unfavorable (IV-VII months). The value of the Sielianinow coefficient ranged from 0.0 to 1.8 (extremely dry-slightly humid). The extremely unfavorable weather conditions during the development of the oats affected the limited development of the pathogen _D. avenue_. The rainfall occurring in July did not affect the intensity of the occurrence of oat helminthosis. The average level of infection of the control objects for the analyzed varieties was measured at 6.62%. The infection of oat varieties with _P. coronata_ was recorded in 2013, 2014, and 2016 (Table 5). During the years of observation, the average infection of the flag and sub-flag leaves was recorded in the control objects of the examined varieties at the level of 1.40-13.50%. In 2013, the highest infection of plants from control objects was recorded in the Arden (an average of 13.05% of the infected leaf blade area), Arab (11.75%), and Bingo (11.35%) varieties. The effectiveness of triazoles and strobilurins in reducing _P. coronata_ ranged from 82.1 to 100.0%. The highest effectiveness was achieved with epoxiconazole and tebuconazole in the Maczo variety, at 100%. The effectiveness of azoxystrobin ranged from 82.1 to 98.3% in all cultivars. In the case of picoxystrobin, the effectiveness of controlling crown rust was 95.4-99.1% in all varieties. In 2013, the weather conditions for the development of oats plants were moderately optimal (IV-VII months). The value of the Sielianinow coefficient ranged from 0.7 to 1.9 (very dry-slightly humid). The conditions prevailing during the development of the flag and sub-flag leaves allowed the causal agent of oat crown rust to develop undisturbed. The average level of infection of the control objects for the analyzed varieties was measured at 8.00%. In 2014, the infection of control plants amounted to 3.19-7.81% of infected leaf blades. The Maczo variety was the least infected, and Breton was the most infected. Statistically significant differences between the values of leaf blade infection were found between the Arab and Breton cultivars and the Maczo cultivar. In the Arab, Arden, and Breton varieties, statistical differences were proven between the amount of control infection and the combinations in which triazoles and strobilurins were used. In the Bingo variant, significant differences occurred in the case of the combination in which tebuconazole was used. No significant differences were noted in the Maczo variety. The highest effectiveness in reducing the disease was achieved after the use of tebuconazole, at 86.3-94.5%, depending on the variety cultivated, and after epoxiconazole, 60.8-85.7%. The lowest effectiveness was obtained after the use of azoxystrobin in the Arab, Bingo, and Maczo varieties, at 7.8-49.6%.