The thermocycling was concluded as being able to change composite resins' surface roughness, whereas different finishing and polishing methods did not result in surface roughness changes after thermocycling.

SDRIFE-like rash in COVID-19 patient: drug reaction or another cutaneous manifestation of SARS-CoV-2?Dear Editor,We report a particular case of skin rash in a patient with COVID-19. Symmetrical drug-related intertriginous and flexural

RESUMOUma das premissas do sistema plantio direto é a manutenção de palhada sobre a superfície do solo. Porém, o tamanho das partículas em função dos diferentes implementos de corte utilizados para formação da palhada, pode influenciar sua taxa de decomposição. Objetivou-se avaliar, em um Latossolo Vermelho distroférrico sob condições irrigadas no Cerrado, a influência de diferentes manejos da palhada de espécies forrageiras do gênero Urochloa no acúmulo de nutrientes, taxa de decomposição da palhada, desenvolvimento da cultura do milho em sucessão e nos atributos químicos do solo para fins de fertilidade. O experimento foi instalado em delineamento em blocos casualizados, com 4 repetições em arranjo fatorial 2 x 4, constituído por duas espécies forrageiras (Urochloa brizantha cv. Xaraés e Urochloa ruziziensis) e quatro formas de manejo das espécies (roçadora, triturador horizontal de palha, rolo-faca e planta inteira) após a dessecação química das plantas. A U. ruziziensis, proporcionou maior acúmulo e remanescência de nutrientes sobretudo N e K no período de 180 dias após o manejo, além de promover a mais rápida decomposição e liberação de nutrientes em comparação com a U. brizantha, tal como o manejo das plantas com o uso do triturador horizontal de palha. O cultivo das espécies forrageiras e os diferentes manejos da palhada não interferiram na produtividade de grãos do milho em sucessão, não alterando, portanto, os atributos químicos do solo. Palavras-chave: manejo da palhada, plantio direto, Urochloa brizantha, Urochloa ruziziensis, Zea mays Nutrient accumulation and decomposition of straw of Brachiaria in function of different cutting management and production of corn in succession ABSTRACTOne of the premises of the no-tillage system is the maintenance of straw on the soil surface. However, the particle size by different cutting implements used for straw formation can influence its rate of decomposition. Therefore, the objective of this study was to evaluate in a Red Latosol (Oxisol) under irrigation in the "Cerrado" conditions, the influence of different straw management methods of Urochloa forage over accumulation of nutrients, straw decomposition rates, development of the subsequent maze crop and soil chemical attributes of soil fertility. The experiment was installed in randomized block design with 4 replications in a factorial arrangement 2 x 4, two forages species (Urochloa brizantha cv. Xaraés and Urochloa ruziziensis), and four different cutting management (mowing, horizontal grinding, knife-rolling and whole-plant), after plants chemical desiccation. It was found that U. ruziziensis provides greater accumulation and reminiscent nutrients, mainly N and K during the period of 180 days, besides, promoting faster decomposition and nutrients release compared to U. brizantha, as well as the plants management under chemical desiccation using a horizontal grinder compared to the others. Both the cultivation of forage species and the different straw management systems did not interfere on grain productivit...

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-The combination of crop residues or crop extracts is often more advantageous in controlling weeds, than the application of each residue or extract singly. This suggests that in intercropping with maize, the combination of tree species can be more advantageous than species isolated in weed control. The objective of this study was to evaluate the effects of intercropping with a combination of leguminous on the weed growth and corn yield. A randomized-block design with split plots (cultivars in plots) and five replicates was established. The cultivars BR 205 and AG 1041 were subject to the following treatments: two weedings (A), intercropping with sabiá (B), gliricidia (C), gliricidia + sabiá (D) and no weeding (E). In the B and C, 30 viable seeds m -2 of the leguminous were sown. In the D, 15 seeds of each species were sown m -2 . The legumes were sown by random casting during corn planting. The sequence of the best treatments in reducing the growth of weeds is A > B = C = D = E. The sequence of the best treatments when are considered the yields of baby corn, green corn and grain is A > B > C > D > E. The cultivars do not differ in regards to the reduction in weed growth. In terms of corn yield cultivar BR 205 is the best.Keywords: Zea mays, Gliricidia sepium, Mimosa caesalpiniifolia, green corn, grain yield. RESUMO -A combinação de resíduos ou extratos das culturas frequentemente é mais vantajosa do que a aplicação isolada dos resíduos ou extratos, no controle das plantas daninhas. Isso sugere que, na consorciação com o milho, a combinação de espécies arbóreas pode ser mais vantajosa do que espécies isoladas no controle de plantas daninhas. O objetivo deste estudo foi avaliar os efeitos da consorciação do milho com uma combinação de leguminosas arbóreas sobre o crescimento das plantas daninhas e o rendimento do milho. Utilizou-se o delineamento de blocos casualizados com parcelas subdivididas (cultivares nas parcelas) e cinco repetições. Os cultivares BR 205 e AG 1041 foram submetidos aos seguintes tratamentos: duas capinas (A), consorciação com a sabiá (B), consorciação com a gliricídia (C), consorciação com a sabiá + gliricídia (D) e sem capinas (E).

The sweetpotato (Ipomoea batatas L., Convolvulaceae family) originated in Latin America and is currently cultivated worldwide. The storage roots, rich in calories, have made this crop one of the main caloric sources for low-income populations, especially in developing countries. Brazil annually produces about 805,000 tons, with the Northeast region responsible for 34% of this production (Albuquerque et al. 2020). In October 2019, sweetpotato plants cv. Campina, from a field in the region of Touros, state of Rio Grande do Norte (RN), Brazil (5°12’31”S 35°34’42”W), presented deformed storage roots, with galls, typical of root-knot nematodes. The roots were sent to the Nematology Laboratory (LabNema) where 14,032 eggs and 3,312 second-stage juveniles (J2s) of Meloidogyne sp., in 10 g of roots, were recovered. The species of adults was identified through morphological, biochemical, and phylogenetic analysis. The perineal region of females (n = 10) presented an oval shape, with a high and semi-trapezoidal dorsal arch and streak-free perivulval region. The labial region of males (n=10) presented high and rounded head cap, labial region slightly set off from the body, without annulations. The morphological characters were compatible with the original description of Meloidogyne enterolobii (Yang and Eisenback 1983). The phenotype of esterase isoenzymes showed two major bands (VS1-S1) also characteristic of M. enterolobii (Esbenshade and Triantaphyllou 1985). Sequences of 18S rDNA (~1200bp) of individual females (Holterman et al. 2006) obtained from sweetpotatoes before (SPme1 and 2) and after inoculation (SPme3 and 6), and from guava, used as M. enterolobii species control, were submitted to Bayesian analysis. The sequences presented genetic diversity among them resulting from seven SNPs (Single Nucleotide Polymorphism) and 99.4 to 99.9% identity with M. enterolobii sequences deposited in the NCBI GenBank (accession numbers MW209034-MW209039). The pathogenicity test was carried out under greenhouse conditions, in which 3,000 eggs and J2s from the original population isolated of M. enterolobii were inoculated in sweetpotato seedlings cv. Campina (n = 6). After three months, the roots presented galls and deformations typical of root-knot nematodes, while non-inoculated plants did not present any symptoms. An average of 15,900 eggs and J2s of M. enterolobii (RF = 5.3) were recovered from the roots, proving that sweetpotatoes were a host of this species. Meloidogyne enterolobii is known to cause great damage to sweetpotato (Ye et al. 2020). In Brazil, Meloidogyne nematode had been reported once, isolated from a sweetpotato field in the Ceara state and the species suggested by the authors according to esterase electrophoresis was M. enterolobii. Nonetheless, the authors did not present taxonomic, isoenzyme phenotypes and molecular species identification integratively, nor included pathogenicity tests (Silva et al. 2016). Therefore, it is the first time that M. enterolobii, with reliable identification by different methods, including sequencing, was detected in commercial sweetpotato fields in the RN state and in Brazil. The local farmers reported that this nematode deforms the storage roots which make them useless for commercialization, resulting in minimal losses of 50% of production in the infested areas. Furthermore, as sweetpotatoes are vegetatively propagated, the spread of this nematode through planting material is favored. Considering the importance of this crop in Brazil, this report is essential for control measures of this pathogen to be taken in order to avoid its spread to other regions.

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The bordeaux mixture is used as a natural agricultural fungicide, and its application in sericulture can benefit the production of silkworm cocoons, Bombyx mori (Lepidoptera: Bombycidae). The aim of this study was to verify whether the bordeaux mixture exerts a protective effect in B. mori against fungal and viral diseases. This experiment was performed during two seasons, autumn and spring, in which 7,500 caterpillars were used at the beginning of the third instar and divided into five groups, with three repetitions of 500 individuals each. In the three groups, the caterpillars were fed leaves of Mulberry (Morus spp.) that were enriched with an aqueous bordeaux mixture solution at concentrations of 5, 10 and 20%. One group was fed exclusively mulberry leaves (control), and another was fed leaves that were moistened with water. Fungal contamination was evaluated in the integumentary surface of the insect and the mulberry leaves in the bed of creation by checking the number of colony-forming units (CFU). In the analysis of viral contamination, 20 caterpillars from each group at the beginning of the fifth instar were inoculated with 10 µl of a suspension of Bombyx mori nucleopolyhedrovirus (BmNPV). Daily, from the second to the ninth day after inoculation (dai), two caterpillars of each group were anesthetized and formalin-fixed 7% for microscopic processing and viral cytopathology analysis. A completely randomized design was used, and the CFU were compared by Tukey test with 5% significance. The results showed a decrease of 55.1% in CFU present on the mulberry leaves in the fall, when the 5% bordeaux mixture solution was used. There was no significant difference between the groups based on the bordeaux mixture in this period. During the same period, reductions of CFU of 28.5, 74.9 and 74.4% were verified in the integument of B. mori when bordeaux mixture solutions of 5, 10 and 20% were used, respectively, compared with the data that were obtained in the control group. In the spring, no difference was observed between the groups that received bordeaux mixture solution and the control. In the case of BmNPV, the 10% bordeaux mixture solution promoted greater resistance to viral infection, possibly favoring the activation of defense mechanisms of insects. Therefore, we recommend the use of a 10% bordeaux mixture solution in mulberry leaves to control fungal and viral diseases in silkworm rearing. ResumoA calda bordalesa é um produto usado como fungicida agrícola natural e sua aplicação em sericicultura pode beneficiar a produção de casulos do bicho-da-seda, Bombyx mori (Lepidoptera: Bombycidae). O objetivo deste estudo foi verificar se a calda bordalesa exerce efeito protetor em B. mori contra doenças fúngicas e virais. O experimento foi realizado em dois períodos sazonais, outono e primavera, sendo utilizadas 7.500 lagartas no início do terceiro instar, divididas em cinco grupos, com três repetições de 500 indivíduos cada. Em três grupos as lagartas foram alimentadas com folhas de amoreira (Morus spp.) enri...