ABSTRACT:The Agata potato is the most important economic sources of food in Brazil. However, fertilization for this crop has been carried out incorrectly, increasing production costs. Thus, the use of organomineral fertilizer reduces the amount of nutrient applied, facilitates the release of nutrients more slowly and brings improvement in the chemical, physical and biological attributes of the soil. The objective of this work was to evaluate the efficiency of organomineral fertilizers rates and comparate with mineral source on the potato crop in differents seasons. The experimental design was in randomized blocks, with five rates and four replications in the winter season. In the harvest of the rainy season the experiment consisted of 6 rates and four replications. Treatments were 1629.0; 2444.0; 3258.0; 4073.0; 4887.0 kg ha -1 of the organomineral fertilizer which equals 40; 60; 80; 100 and 120% of the rate in relation to the mineral fertilizer of 2800 kg ha -1 of formulation 03-32-06. There weren`t significant difference of the organomineral fertilizer in relation to the mineral in the total, commercial and special class of tubers in the winter crop. In the harvest of rainy crop, the average total productivity of potato tubers at all rates of organomineral fertilizer was 29 t ha -1 , which represents 22% higher than mineral fertilizer. The organomineral fertilizer presented agronomic efficiency for potato cultivation and could replace NPK mineral sources. The 4887.0 kg ha -1 organomineral rate generated higher total yield, commercial and special class of tubers.

O uso de inseticidas mais tóxicos para uma praga do que a saúde natural pode favorecer o salvamento desses organismos benéficos. Este estudo teve como objetivos fisiológicos distanciadores de inseticidas de separações científicas para Vespidae Protonectarina sylveirae (Saussure, 1854) e Brachygastra lecheguana. (Latterille, 1824) e espessura de cutícula para avaliação da tolerância entre os 2 anos estes mesmos inseticidas. Como imersas foram folhas de milho (10 x 10 cm) em solução inseticida em dose (100%), subdose (50%) e água destilada (controle) por 5 segundos. Nós podemos ler as folhas e depois embalamos em placas de Petri.Como 20 vespas, por placa, receberam 10% de mel e as placas foram fechadas com tecido de organza fino e elastificadas. Após 24 horas, avaliamos uma porcentagem de vespas mortas. O inseticida alfa-cipermetrina foi altamente tóxico para P. sylveirae e B. lecheguana em dose (100%) e subdose (50%). Os inseticidas Novaluron, chlorantraniliprole, spinosad e indoxacarb foram pouco tóxicos para P. sylveirae e B. lecheguana. dose (100%) e subdose (50%). A alta toxicidade dos inseticidas metomil + novalurom, clorantraniliprole + lambda-cialotrina e deltametrina a P. sylveirae corresponde à menor espessura da cutícula.Portanto, os inseticidas novalurom, clorantraniliprole, spinosad e indoxacarb da selectividade fisiológica para P. sylveirae e B. lecheguana .

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Objetivo: avaliar a densidade e repelência de formigas predadoras nos diferentes acessos de tomateiros Solanum lycopersicum. Método: as avaliações foram realizadas quinzenalmente em todos os materiais genéticos testados (variedade Santa Clara como padrão de suscetibilidade, e os acessos PI 134417 como padrão de resistência e o acesso PI 127826). Resultados: Na variedade Santa Clara e no acesso PI 134417 houve maior quantidade de formigas da espécie Solenopsis sp. 4, enquanto que no acesso PI 127826, foi mais abundante a espécie Pheidole sp. Contudo, comparando entre os tratamentos, as espécies Solenopsis sp. 3, Pheidole sp. 6, Dorymyrmex sp. 2, Camponotus sp. 2, foram vistos em maior quantidade na variedade Santa Clara, e Solenopsis sp. 4 foi igual para Santa Clara e o acesso PI 134417, somente Camponotus sp. 3 foi mais no acesso PI 127826. O extrato de PI127826 apresentou repelência para todas as espécies. Conclusão: destaca-se a que a incidência bem como a densidade de espécies de formigas está diretamente associada com cultura e com o tipo de manejo de controle utilizado.

The control of Hypothenemus hampei, coffee berry borer (CBB) is difficult as the insects infest inside coffee berries and are thus protected from agrochemicals. Coffee varieties with an increased penetration time by H. hampei can help control this pest tends to be exposed insecticide action for long time. Therefore, this study aimed to determine the time taken by H. hampei to entirely penetrate berries of different coffee varieties and whether insecticides have any influence on the penetration time. Thus, twenty five berries of 27 coffee varieties in the green phenological stage were introduced in rubber caps, with the berry crown exposed.. From this experiment, seven varieties were selected for another bioassay, with insecticides being sprayed on the berries. Copulated female H. hampei were released on the berry, and the penetration time was assessed. Finally, a free-choice test to verify H. hampei food preference was performed, using the same seven coffee varieties. The insects took longer to penetrate the Arara, Catuaí Vermelho IAC 144, and Guará coffee-variety berries. Moreover, all coffee varieties treated with the insecticide cyantraniliprole inhibited penetration by H. hampei. Most coffee varieties treated with insecticides showed a prolonged penetration time by H. hampei compared to the same untreated ones, except for the chlorpyrifos insecticide in the Catuaí IAC 144 and IAC 62 varieties. Additionally, H. hampei showed no feeding preference among the different tested coffee varieties.

No abstract

Liriomyza spp. (Diptera: Agromyzidae) causes losses of 54 million dollars in beans Phaseolus vulgaris L. and spinach Spinacea oleracea L. (Pratt et al., 2017).The main agromizids that affect the system of production in the world are Liriomyza huidobrensis (Blanchard), L. trifolii (Burgess) and L. sativae (Blanchard) (Guantai et al., 2015). Females of these species oviposit within the leaves and larvae consume the mesophyll, and mine leaves of serpentine format (Parrella et al., 1985). Additionally, the females using her ovipositor to puncture the surface of leaf and facilitates the infection by pathogenic fungi as Alternaria leaf on Solanum lycopersicum L. (Durairaj et al., 2010). Infestations of L. huidobrensis in Allium sativum L. were reported in the Chile, China, Colombia, Indonesia and Spain (Weintraub, 2001;Weintraub et al., 2017). However, occurrences of Liriomyza spp. on A. sativum in Brazil were not reported. Higher infestations of pests and diseases in this crop may lead to changes in production and reduce the quality of the bulbs (Moura et al., 2013). Thus, the objective was to report, for the first time, the attack of the Liriomyza spp. on A. sativum in Brazil.Liriomyza spp. was collected on 50 garlic fields from March 2017 until August 2018. The evaluated garlic cultivars were Ito (46 fields-60 ha), Chonan (1 field-20 ha), Roxo pérola de caçador (1 field-35 ha) and Gravatá (2 fields-12 ha) in the municipality of Rio Paranaíba-MG (19°12'41.3" S; 46°13'56.9" W; altitude: 1,122 m). The evaluations were performed at 15, 75 and 135 days after the emergence of garlic. Five leaves ha -1 were random collected in each area. The leaves were collected placed in paper bags