Net blotch disease caused by Pyrenophora teres is one of the most damaging fungal diseases of barley crop. This study screened comparatively the effectiveness of eleven fungicide products applied to malting barley (Hordeum vulgare L. conv. distichum Alef.) cultivar ‘Daciana’ in conditions from Transylvania. After fungicide treatment, the net blotch disease index decreased an average of 70.37-78.04% relative to untreated control. Fungicide application ensured an average of 28.66% grain yield increase, 7.51% thousand grains weight increase and 4.36% grain starch content increase relative to untreated control. Top performance was obtained by using products that contained demethylation inhibitors targeting sterol biosynthesis in combination with other active substances with a different mode of action particularly targeting mitochondrial respiration. It is a difficult task to achieve top performance on all dimensions: strict disease suppression, high quantity and quality grain yields. Preventing the occurrence of pathogen resistance to fungicide and minimizing negative effect on crop as well as remanence in the plant, are the main challenges for fungicide use and should receive further attention.
In the last few years, Romania has become a top maize producer. Export potential is sustained by ensuring high-quantity and -quality maize. Success of maize crop is highly dependent on inputs. In this context, insight into the potential of different fertilizers to maximize crop performance could shed light on best practices to enhance yields and other traits of interest. The aim of this study was to assess the agronomic performance of maize under a fertilization gradient. Six fertilizer regimes were tested on three maize hybrids between 2018 and 2020, in conditions from the Transylvanian Plain. Results showed that fertilization had a significant influence on yield, thousand kernels weight, grain quality (starch and protein content) and crop health. The experimental year also played a significant role in the expression of productivity potential of maize genotypes. Different fertilizer regimes could be used for targeting desired outcomes, but top performance across all or multiple agronomic components remains a challenge and should receive further attention for optimization.
The effect of the number of fungicide treatments in vegetation on the quality and quantity of the autumn yield was studied in 2012-2014 at Agricultural Research & Development Station (ARDS) Turda, in the Phytopathology laboratory field. The study was conducted with three wheat varieties: Arieșan, Dumbrava and Andrada and the test variants were: no treatment (T0), one treatment, (T1) and two treatments (T2). The vegetation treatments were carried out with the products Nativo (1 l/ha) and Prosaro (1 l/ha). Since the Fusarium head blight, produced by different species of the genus Fusarium, is the most important disease in wheat crops and has a high impact on the quality and quantity of production, the percentage of diseased kernels was determined. Applying vegetation treatments with fungicides decreased the percentage of diseased grains compared to the control. The yield increased when treatments were applied. The gluten and the protein content recorded a slight decrease or increase, depending on the variant; the ash content decreased when the treatments were applied during the vegetation period. The application of fungicide treatment on the vegetation is an important link in the wheat crop management, ensuring higher quantitative and qualitative production.
The paper presents data about wheat pest attack in Transylvania in the last 10 years, under the different climatic, phenological and technological conditions, with details of the correlations of the climatic factors with the bio-ecology of the species or pest groups. Such data may be important for modelling and forecasting wheat pest attacks. The climatic warming, represented strong environmental factors (R2 = 0.43), which led to changes in the species structure, favouring the development of the populations of a narrow spectrum of species becoming dominant and dangerous by numerical increases. In the years 2006-2015, the eudominance of thrips (58%), the dominance of aphids (14%) and of wheat flies (12%), the subdominant species of Chrysomelidae and the increase of entomophagus abundance were revealed. In the year 2016, the weight of the dominant groups of wheat flies (25%), aphids (21%), leafhoppers (18%), thrips (17%), of the subdominant group of Chrysomelidae (10.6%) and cereal bugs (4.5%) increased. Changes in entomocenotic interactions phytophagusentomophagus, changes in pest dynamics, and of optimal moments for treatments important in the development of integrated pest control systems, have occurred in wheat crops. In the conditions of the area, the annual abundance of entomophagus is determined by the annual abundance of phytophagous insects, as expressed by a positive correlation (R2 = 0.464 and D% = 46.4%). Under the conditions of the last 10 years, the annual ratio of the number of phytophagous / entomophagus fluctuated between 2.35 and 12.42. The size of the phytophagous / entomophagus ratio was strongly correlated with the increase of the average annual temperatures, with a percentage determination coefficient D% = 15.5%, having an optimum of the interactions at values of 6.3 phytophagous / 1 entomophagus, and less well correlated with the annual precipitations. These changes in wheat entomocenoses, the biological potential accumulated over the last 10 years and at the level of 2016 indicate the importance of adapting pest control strategies, which should include preventive methods (respecting the optimum sowing time, agro-technical and phytosanitary methods), insecticide treatments on seed and on vegetation, at optimal application times for the groups of pests whose attacks overlap, respectively the first treatment in the spring, no later than the end of tillering, for wheat flies, leafhoppers, Chrysomelidae etc.; the second treatment at the phenophase of flag leaf stage and ear appearance, for thrips, aphids, bugs etc.; and other treatments at warning. Given the importance of entomophagous arthropod fauna in limiting wheat pests it is necessary to protect and use the auxiliary entomophagus, flora biodiversity involved in achieving the productivity and stability of wheat crops.
The fusarium ear rot caused by pathogens belonging to Fusarium genus is one of the most important diseases responsible for high economic losses, resulting from the decline of the production’s quantity and quality. The objective of the present study was the identification of sources of cytoplasm that convey resistance to fusarium ear rot within certain inbred isonuclear lines. Twenty five maize inbred lines: 20 isonuclear inbreds (obtained by transferring the nucleus of five elite inbred lines on four different cytoplasms) and five lines using the original cytoplasm were studied in three experimental years 2012, 2013 and 2014. The analysis of variance for fusarium ear rot showed the very significant influence of factors years and nucleus and the significant action of the cytoplasm. The resistance to fusarium ear rot of each isonuclear line was compared to the line with original cytoplasm, over the three years of the experiment. Genetic variability within isonuclear groups regarding the resistance to fusarium ear rot was observed. The greatest difference in the degree of attack on the maize cob in comparison with the original cytoplasm (-4.92%), was noted for isoline TB 243 x TB 329, which showed a very significantly negative difference. Changing cytoplasm resulted in genotypes with a good resistance to the Fusarium spp. attack; therefore the use of these genotypes is recommended in creating of new hybrids.
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