Occurrence of Atopozelus opsimus preying on nymphs and adults of Glycaspis brimblecombei

The stink bugs genus Atopozelus (Hemiptera: Reduviidae) is native in the Americas, with five described species of which only three have been recorded in Brazil. In August 2007, Eucalyptus camaldulensis leaves infested by lerp psyllid were collected and taken to the Forest Pest Biological Control Laboratory situated at São Paulo State University. A small green stink bug, identified as Atopozelus opsimus Elkins (Hemiptera: Reduviidae) that fed on nymphs and adult psyllids, was found on the leaves. These stink bugs presented phytophagy, omnivory and ability in opening the lerp (shell) that protect the psyllid. A. opsimus has demonstrated unusual particularities, different from many biological control agents found in nature; this predator thus deserves more attention for its potential to be evaluated.

Nymphal development, lipid content, growth and weight gain of Nezara viridula (L.) (Heteroptera: Pentatomidae) fed on soybean genotypes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Flavonoid increase in soybean as a response to Nezara viridula injury and its effect on insect-feeding preference

The ability of the stink bug (Nezara viridula) to induce and/or increase production of chemical defenses, i.e., flavonoids, in immature seeds of five genotypes of soybean (BR-16, IAC-100, PI 227687, PI 229358, and PI 274454) was investigated under greenhouse and laboratory conditions. Samples from pods of each genotype damaged by stink bug were analyzed for flavonoid content with high performance liquid chromatography. A dual-choice test was conducted to evaluate the feeding preference of N. viridula comparing BR-16 pods treated with extracts of PI 227687 seeds (with and without stink-bug injury), with water-treated pods. Seeds of PI 227687 damaged by N. viridula presented the highest concentration (352 mug/g) of daidzin (4'-hydroxyisoflavone-7-glucoside). The same trend was observed with genistin (4',5,7-trihydroxyisoflavone-7-glucoside): PI 227687 contained 142.4 mug/g, PI 274454, 31.6 mug/g, and PI 229358, 38.9 mug/g. Seeds damaged by stink bugs had higher isoflavone contents (daidzin and genistin), compared to controls. However, after being damaged, PI 274454 and PI 229358 produced less genistin than the other genotypes and no differences in concentration between damaged and nondamaged plants of this genotypes were observed. The numbers of observations of the insect feeding and the numbers of stylet sheaths left in water-treated BR-16 pods were greater than in those treated with PI 227687 extracts. The insects fed for longer periods on BR-16 pods treated with extract of PI 227687 without injury compared to those that were treated with extract of PI 227687 previously injured by stink bugs. Extracts of PI 227687 pods ( damaged or not) were deterrent to adults of N. viridula, and insect injury increased concentrations of daidzin and genistin in PI 227687 seeds. The deterrence seemed to be more pronounced after pods had suffered stink-bug injury.

Desenvolvimento de "Nezara viridula" (L., 1758) (Hemiptera: Pentatomidae) em genótipos de soja

The soybean (Glycine max (L.)) has been significantly compromised by the attack of insect pests. The stink bug Nezara viridula (L.) (Hemiptera: Pentatomidae) is pointed as one of the most damaging species, reducing the quantity and quality of grain produced and requiring a large number of applications of insecticides in crops. Al-though chemical control is still the most widely used method of control, the use of resistant genotypes may represent a viable alternative in the management of this insect, reducing costs and impacts on the environment. This study evaluated the performance of nymphs of N. viridula in nine soybean genotypes under laboratory conditions (T = 25 + 2[degree]C, RH = 70 [plus or minus]10% and photoperiod = 12 h), aiming to detect possible resistance mechanisms. Thus, 25 nymphs/genotype were monitored daily by assessing the duration and mortality of the nymphal stage, the weight of nymphs and adults and the developmental period from egg to adult. The data revealed that the genotypes 'TMG-103', 'TMG-121, IAC-19', 'TMG-117', and 'IAC-24' caused 100% mortality of nymphs, indicating high levels of antibiosis and/or feeding non-preference expression. 'IAC-17' also prolonged the nymphal period, indicating the occurrence of resistance. The insects from 'PI-227687' showed the lowest average weight, also indicating the occurrence of antibiosis and/or feeding non-preference. Our results may be useful for soybean breeding programs focusing on development of genotypes resistant to insects.

Comparison of eggs, larvae, and pupae of plutella xylostella (lepidoptera: Plutellidae) as prey for podisus nigrispinus (Hemiptera: Pentatomidae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Aspectos biológicos e taxa de consumo de Orius insidiosus (Say, 1832) (Hemiptera: Anthocoridae) predando Plutella xylostella (L., 1758) (Lepidoptera: Plutellidae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Resistência de genótipos de soja Glycine max (L.) a Nezara viridula (L. ,1758) (Hemiptera: Pentatomidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência de sistemas de semeadura na população de pragas e nas características morfofisiológicas em cultivares de soja

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

cis-Jasmone e Tween 20 na indução de metabólitos secundários em soja e seus efeitos em insetos-praga

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Feeding preference of Nezara viridula (Hemiptera: Pentatomidae) and attractiveness of soybean genotypes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Assessing antixenosis of soybean entries against Piezodorus guildinii (Hemiptera: Pentatomidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Resistência de genótipos de soja a Dichelops melacanthus (Dallas)(HEMIPTERA: PENTATOMIDAE)

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Sequential sampling of Euschistus heros (Heteroptera: Pentatomidae) in soybean

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Dinâmica populacional, distribuição espacial e plano de amostragem sequencial de Euschistus heros (Fabricius, 1794) (Heteroptera: Pentatomidae) em cultivares de soja

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estabelecimento do capim-massai em consórcio com milho AG-1051 e Bt, em áreas infestadas pelo percevejo castanho das raízes.

The system consortium of grain crops with forage plants allows the establishment of pastures resistant, vigorous and lower cost in areas infested with stink bug brown root. Maize has favorable characteristics for intercropping as high plant height and insertion height of the studs, allowing the crop to occur without interference of forage plants. Furthermore, the production system in consortium with Bt corn reduced the infestation of Spodoptera frugiperda and was not affected by Scaptocoris carvalhoi (Hemiptera: Cydnidae), The Panicum maximum cv. Massai allowed a consortium with excellent corn and pasture provided a vigorous and excellent leaf mass distribution and very deep roots in the soil. Grain yield for Bt corn was higher and significant (P <0.05), compared to other treatments. The use of Lorsban (1.5 liters / ha) and Thiodan (2.0 liters / ha) was highly effective (P <0.05) in the control of Spodoptera frugiperda and Scaptocoris carvalhoi (Hemiptera: Cydnidae).