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This study aimed to develop and validate a standard area diagram set (SADS) to quantify the severity of blast, caused by Pyricularia oryzae, on wheat leaves. The SADs has ten levels: 0.1, 1, 5, 10, 22, 32, 42, 52, 62 and 72 % blast severity. To validate the SADs, 12 inexperienced raters estimated disease severity on 50 images of leaves from cultivars BR-18(More)
It is well known that silicon (Si) increases the resistance of many plant species to several pathogens, including Pyricularia oryzae, the causal agent of blast on wheat, but the mechanisms underlying such resistance remain elusive. This study was carried out to investigate whether Si-mediated wheat resistance to blast could be linked to host defense(More)
The area of sugar cane production in Brazil has substantially increased in the last few years due to the high demand for ethanol. It is estimated that the actual area, which is approximately 8 Mha, will increase to as much as 15 Mha in the next 10 years. In addition to enlarging the boundaries and installing new industrial units, sugar cane expansion(More)
a r t i c l e i n f o The use of high spatial resolution, on-the-go proximal soil sensing of apparent electrical conductivity (EC a) through electromagnetic induction (EMI) is increasingly common, in concert with yield mapping, to assist in the delineation of management zones for Precision Agriculture (PA). Less common, but gaining in popularity, is the use(More)
Considering the importance of magnesium (Mg) in plant metabolism and the lack of information regarding the effect of this macronutrient on the rice-Monographella albescens interaction, the present study aimed to investigate whether an increase on the foliar concentration of Mg could decrease the symptoms of leaf scald on rice leaves. Rice plants were grown(More)
Mango wilt, caused by Ceratocystis fimbriata, is a disease of great economic importance in mango production. Considering that the physiological effects of this vascular disease are not fully characterized, this study aimed to investigate some alterations in mango leaves from cultivars Ubá and Tommy Atkins, respectively, resistant and moderately resistant to(More)
Macrospora leaf spot, caused by Stenocarpella macrospora, is an important disease of maize. However, little information is available regarding the infection process of this fungus on maize leaves. This study aimed to describe stages of the infection process of S. macrospora on maize leaves by using both light and scanning electron microscopy. The adaxial(More)
The present study aimed to do an in-depth analysis of the effect of leaf scald on rice physiology by combining gas exchange measurements, photosynthetic pigment pools and examining the activities of enzymes involved in the antioxidant system. The size of leaf scald lesions increased from 3.1 mm at 24 h after inoculation (hai) to 25.2 mm at 120 hai. For the(More)