FJ649199), all of which are members of group 16SrII, ‘Candidatus Phytoplasma aurantifolia’. Results confirmed the ability of E. papayae to transmit the BTS phytoplasma. “
“This study investigated the effect of potassium (K) on sheath blight (Rhizoctonia solani) development on rice plants from cultivars BR-IRGA 409 and Labelle grown in nutrient solution containing 0, 50 and 100 mm of K. Sheath blight progress on inoculated sheaths was evaluated by
measuring the relative lesion length at 48, 72, 96 and 120 h after inoculation (hai). Data were this website used to calculate the area under relative lesion length progress curve (AURLLPC). The foliar K concentration on leaf sheaths tissue increased by 61.48 and 116.05% to cultivars BR-IRGA 409 and Labelle, respectively, as the K rates increased from 0 to 100 mm. A linear model best described the relationship between the AURLLPC and
the K rates. The AURLLPC decreased by 29.2 and 21.3% Staurosporine cell line for cultivars BR-IRGA 409 and Labelle, respectively, as the K rates in the nutrient solution increased. It can be concluded that high K concentration on leaf sheaths tissue was important to decrease sheath blight symptoms on rice leaf sheaths. “
“Taraxacum officinale (dandelion) is a medicinal plant that occurs in various countries and is also reported as an invasive plant in some parts of the world. Recently, a severe case of southern blight was observed in dandelion in the Medicinal Plant House at the State University of Maringa, Umuarama, State of Parana, Brazil. 上海皓元医药股份有限公司 A dense,
cottony mycelial growth and the formation of sclerotia were observed on the plants. The fungus was isolated, inoculated into healthy plants and re-isolated. Samples were sequenced for rDNA regions ITS4 and ITS5. The inoculated plants presented symptoms of southern blight, beginning at the base of the plant and eventually killing the plant. DNA analysis revealed a 99% species identity index for Athelia rolfsii (anamorph: Sclerotium rolfsii). “
“Brown spot, caused by the fungus Bipolaris oryzae, is one of the most destructive diseases of rice. This study investigated the effect of zinc rates on the development of brown spot in rice. Rice plants (cv. ‘Metica-1′) were grown in hydroponic culture amended with Zn rates (applied as ZnSO4.7H2O) of 0, 0.5, 1, 2 and 4 μm and inoculated with B. oryzae. The foliar concentration of Zn was determined. Leaf samples were assessed for disease severity, and then, area under brown spot progress curve (AUBSPC) was calculated. The relationship between Zn concentrations on leaf tissues and the rates of this micronutrient was best described by a positive linear regression model, while the relationship between the Zn rates and the AUBSPC was best described with a positive quadratic regression model. The correlation between Zn concentrations on leaf tissues and AUBSPC was positive and significant (r = 0.68, P < 0.05).