The tobacco budworm, Heliothis virescens (F.) (Lepidoptera: Noctuidae), damages soybean crops by feeding on the leaves, pods, and terminal buds. The purpose of this study was to evaluate antibiosis resistance to H. virescens by different soybean cultivars. Soybean cultivars evaluated were P 98Y30 RR, NA 7337 RR, SYN 1163 RR, NK 7059 RR, ANTA 82 RR, M 7110 IPRO, BRS 8160 RR, BRSGO Jataí, and IAC 100. The variables analyzed were duration of the larval stage, percentage of larval survival, larval weight at 10 d, duration of the prepupal stage, percentage of prepupae survival, duration of the pupal stage, percentage of pupal survival, pupal weight at 24 h, total duration of the life cycle, overall survival, and adult longevity. The cultivars BRS 8160 RR, BRSGO Jataí, and P 98Y30 RR were highly susceptible to tobacco budworm, whereas IAC 100 and M 7110 IPRO showed antibiosis resistance to H. virescens. Resumo A lagarta-da-maçã do algodoeiro Heliothis virescens (F.) (Lepidoptera: Noctuidae) pode causar prejuízos na cultura da soja alimentando-se de folhas, vagens e brotos terminais. Objetiva-se com este trabalho avaliar a resistência do tipo antibiose em diferentes cultivares de soja a H. virescens. Foram utilizadas sementes de soja das cultivares P 98Y30 RR, NA 7337 RR, SYN 1163 RR, NK 7059 RR, ANTA 82 RR, M 7110 IPRO, BRS 8160 RR, BRSGO Jataí e IAC 100. As variáveis avaliadas foram: período, e % de sobrevivência do estágio larval e peso de lagartas aos dez dias de idade, período e sobrevivência pré-pupal, período, sobrevivência e peso pupal com 24 horas de idade, ciclo e sobrevivência total e longevidade de adultos. As cultivares BRS 8160 RR, BRSGO Jataí, P 98Y30 RR foram altamente suscetíveis e as cultivares IAC 100 e M 7110 IPRO apresentaram resistência do tipo antibiose à H. virescens.

Rice, Oryza sativa L. (Poaceae), is one of the world's most important food crops. Among the insects that damage rice grains, the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), is the most important species. The objective of this study was to identify rice varieties with resistance to S. oryzae as measured by grain feeding damage and S. oryzae reproduction. The rice varieties evaluated were obtained from the germplasm bank of the National Center of Research Rice and Beans, Embrapa, Brazil. The experimental design was completely randomized with 3 replications and 22 treatments (varieties). The varieties Bonança, Esmeralda, and Rio Verde had the antibiosis and/or antixenosis type of resistance, providing high rates of mortality, low rates of adult emergence, and low rates of grain consumption by S. oryzae. The varieties Pepita and Progresso were susceptible, with a high rate of S. oryzae adult emergence and grain consumption. The presence or absence of a fissure in the grain was a ... Resumo O arroz (Oryza sativa L.; Poaceae) é uma das culturas alimentares mais importantes do mundo. Entre os insetos que danificam os grãos de arroz, o gorgulho do arroz Sitophylus oryzae L. (Coleoptera: Curculionidae) é a espécia mais importante. O objetivo deste trabalho foi identificar variedades de arroz com resistência a S. oryzae. As variedades de arroz avaliadas foram obtidas do banco de germoplasma do Centro Nacional de Pesquisas em Arroz e Feijão, EMBRAPA, Brasil. O delineamento experimental foi inteiramente casualizado com 3 repetições e 22 tratamentos (variedades). As variedades Bonança, Esmeralda e Rio Verde apresentaram resistência do tipo antibiose e/ou antixenose, tendo altas taxas de mortalidade, baixas taxas de emergência de adultos e baixo consumo de grãos por S. oryzae. As variedades Pepita e Progresso são suscetíveis com alta emergência de adultos e consumo de grãos por S. oryzae. A presença ou ausência de fissuras no grão é uma importante característica morfológica para determinar a s...

As formigas-cortadeiras são importantes pragas dos setores agrícola e florestal do Brasil. O controle dessa praga, em geral, tem sido realizado com uso de inseticidas químicos, especialmente iscas formicidas envenenadas. Formas alternativas ao controle químico são conhecidas e podem representar significativo controle dessa praga, entretanto são pouco estudadas. O propósito deste texto é discorrer sobre aspectos bioecológicos e perspectivas de uso de um característico predador de fêmeas de Atta Fabricius, 1804 (Hymenoptera: Formicidae), o besouro predador Canthon virens Mannerhein (1929) (Coleoptera: Scarabaeidae). Esse predador, comumente encontrado em áreas de cerrado do Brasil, decapta as fêmas de saúvas assim que elas aterrizam ao solo pós voô nupcial ou revoada. Essa presa abatida é transportada para o interior de seus ninhos construídos no solo e servirá de alimento para as suas larvas.

This study evaluates the effects of combinations of pyrethroids and neonicotinoids on the control of stink bugs at different stages of soybean crop development. The experiment was set up in a factorial randomized block design (4×6: 4 treatments and 6 stages) with 4 repetitions. The following treatments were tested during the V6/V7, R2, R4, R5.1, R5.5 and R 6 phenological stages: 1 – control (no application), 2 – thiamethoxam + λ-cyhalothrin, 3 – acetamiprid + α-cypermethrin, and 4 – dinotefuran + α-cypermethrin. Infestation, number of damaged seeds, number of pods, number of pods per plant, and yield (kg/ha) were evaluated. Stink bug infestations were smaller when applications commenced during the vegetative stages (V6-V8). Pod numbers and yields were highest in the dinotefuran + α-cypermethrin treatment with applications from V6/V8 to R4. The active ingredients dinotefuran + α-cypermethrin reduced stink bug populations and increased yields and could therefore be considered in integrated pest management (IPM) programs for soybean crops.

Insect pests, including caterpillars, cause losses in maize (Zea mays L.; Poaceae) which is one of the most important agricultural crops in the world. The objective of this study was to evaluate the management of Spodoptera frugiperda Smith & Abbot (Lepidoptera: Noctuidae) with transgenic and conventional maize genotypes. The experiments were conducted in the field in summer crops from the seasons 2014/2015 and 2015/2016 in a randomized complete block design with sub-subdivided plots represented by: control (no control), chemical control (methomyl + diflubenzurom), Integrated Pest Management–spinosade, and biological control (Trichogramma pretiosum Riley; Hymenoptera: Trichogrammatidae) with 3 maize genotypes (Impact VIP 3, P3862 HX, and BM 3061) and 4 replications. Control and reduction of S. frugiperda damage were higher in the Impact VIP 3 corn genotype. The crop yield was higher (11,838.59 kg per h-1), and the damage to the ears was lower in the biological control with T. pretiosum.

Chrysodeixis includens and Spodoptera eridania caterpillars have been considered the most important pests for Glycine max in Brazil. This study evaluated different control strategies for these two important soybean caterpillars and the effects on crop productivity. The control strategies adopted were: BC, IPM, PUI and C (without pest control) and 2 cultivars (BMX Desafio - conventional and TEC Power IPRO – transgenic – Cry 1Ac). The experimental design was in randomized blocks in a factorial scheme (2 x 4) with four replications. The transgenic cultivar TEC Power IPRO presents efficiency in the control of Chrysodeixis includens and low efficiency for Spodoptera eridania. Harmonious practices such as IPM are the best alternative for soybean crops, to minimize Chrysodeixis includens and Spodoptera eridania infestations. The control strategy adopted did not influence soybean productivity.