The use of urease inhibitors and irrigation are management options to increasing the efficiency of top-dressed urea by reducing NH3 volatilization. The purpose of this study was to evaluate the productive performance and N recovery of 'BRS 254' wheat plants without irrigation after applying urea or urea+NBPT [N-(n-butyl)thiophosphoric triamide] as the top dressing. The experiment was carried out in Viçosa, MG, Brazil, between May and September of 2008 using a complete randomized block design with a 2×6+1 factorial arrangement of the following treatments: 1) urea or urea+NBPT, 2) six periods without irrigation (0, 48, 96, 144, 192 or 240 h after applying the top-dressing fertilizer), and 3) a control without N; there were four replications. The data were subjected to an analysis of variance (P≤0.05). The mean values of the treatments with urea or urea+NBPT were compared by Tukey's test (P≤0.05), and the effects of the periods without irrigation were analyzed by a regression (P≤0.05). The results of the study show that NBPT did not lead to agronomic advantages for the wheat crop under the study conditions, and the absence of irrigation after urea application as the top dressing led to less N utilization by the wheat plants.

El uso de inhibidores de ureasa o de riego son opciones de manejo para aumentar la eficiencia de la urea aplicada en cobertera, a través de la reducción de la volatilización de NH3. La investigación tuvo como objetivo la evaluación del desempeño productivo y la recuperación de N por plantas de trigo 'BRS 254' sin riego, después de la aplicación de urea o urea+ NBPT [N-(n-butyl)thiophosphoric triamide] en cobertera. El experimento se llevó a cabo en la ciudad de Viçosa, MG, en Brasil desde mayo hasta septiembre de 2008. Los tratamientos siguieron un arreglo factorial 2×6+1, en el cual la urea o urea + NBPT se combinaron en seis periodos sin riego: 0, 48,96, 144, 192 y 240 horas después de la aplicación del fertilizante en cobertera, además de una muestra de control sin la aplicación de N. Para el diseño experimental, se utilizaron los bloques completos al azar con cuatro repeticiones. Se concluyó que el NBPT no proporciona ventajas agrícolas a la cosecha de trigo, bajo las condiciones estudiadas. La ausencia de riego después de la aplicación de urea en cobertera provee un aprovechamiento menor de N por las plantas de trigo.

Ovos e lagartas de Heliothis virescens (Fabricius) (Lepidoptera: Noctuidae) foram encontrados em frutos de tomateiro da cultivar Santa Clara, em um plantio localizado em área experimental, em Alegre-ES. Essa infestação proporcionou dano de cerca de 10%, caracterizado por perfurações de tamanhos variados na polpa de frutos com diâmetros superiores a 2 cm, variando de acordo com o estádio de desenvolvimento das lagartas. Ovos foram coletados e levados ao laboratório, onde foram mantidos à temperatura de 25±3ºC e 70±10% de umidade relativa até a eclosão. As lagartas recém-eclodidas foram individualizadas em caixa gerbox e alimentadas em fatias de frutos de tomate, onde permaneceram até a fase de pupa para sua identificação. Este é o primeiro relato da ocorrência de Heliothis virescens em frutos de tomate no Brasil.

Eggs and caterpillars of the Heliothis virescens (Fabricius, 1781) (Lepidoptera: Noctuidae) were found in tomato fruits of cv. Santa Clara, in a plantation located in Alegre, Espirito Santo State, Brazil. The attack caused damage in 10% of fruits characterized by different perforation sizes in the pulp of the fruits with diameters of two or more centimeters, depending on the state of development of the caterpillars. Eggs were collected, taken to the laboratory, and kept at 25±3ºC and 70±10% of relative humidity until the larval phase. The caterpillars were individually kept in gerboxes and fed with tomato slices until the pupa phase for identification. This is the first report of the occurrence of Heliothis virescens in tomato fruits in Brazil.