The male-produced sex pheromone of Hedypathes betulinus was identified as a mixture (E)-6,10-dimethyl-5,9-undecadien-2-one (geranylacetone) (1) and its respective alcohol (2) acetate (3). Kinetic resolution promoted by CAL-B in organic media provided both, (R)-(−)-(E)-6,10-dimethyl-5,9-undecadien-2-yl (3) (S)-(+)-(E)-6,10-dimethyl-5,9-undecadien-2-ol high enantiomeric purity. Comparative GC analysis using chiral column revealed the natural constituents being (R)-(3) (R)- (S)-(2) ratio 82.3%...

The damage caused by spittlebugs varies according to the species of grass, and losses can reach alarming levels. Measures for population control are currently restricted use resistant grasses diversification pastures. Therefore, alternative measures necessary, such as botanical insecticides. aim this study was evaluate insecticidal activities thymol, carvacrol, eugenol, cinnamaldehyde, trans-anethole on Mahanarva spectabilis eggs, nymphs, adults under laboratory conditions. In egg tests,...

Abstract Social wasps in the Polybia genus are important for use as pest‐control agents agricultural systems. The objective of this study was to investigate behavioural responses fastidiosuscula Saussure (Hymenoptera: Vespidae) volatiles from maize, both constitutive and those induced by herbivory Spodoptera frugiperda ( JE Smith) (Lepidoptera: Noctuidae). To assess response P. S. larvae, undamaged plants, frugiperda‐ damaged mechanically plants plus regurgitant larvae extracts various...

This study examined effects of elevated CO2 alone and in combination with temperature on plant-aphid interactions. levels which the host plants were grown affected durations some nymphal stadia, but not survivorship within each instar or all instarS. Sipha flava (Forbes) (Hemiptera: Aphididae) adults kept under a constant high environment (500 ppm) fed fluctuating (avg. 440 greenhouse had significantly greater longevity reproduction than aphids either level 368 ppm). Nevertheless, no...

Abstract The mating behaviour and evidence for sex‐specific pheromones of the main pest green mate, Ilex paraguariensis , southern region Brazil, Hedypathes betulinus (Klug, 1825) (Coleoptera: Cerambycidae: Lamiinae), were studied in laboratory. sequence H. includes: female approaching male, antennal contact, male mounting start copulation. This provided support our hypothesis that recognition males by females may be mediated a male‐produced pheromone recognize contact pheromones....

The present study aimed to compare the morphometric measurements of Mangalarga Marchador horses batida and picada marcha.Twenty-two linear eight angular 222 males (130 marcha 92 marcha) 266 females (168 98 were compared in a completely randomized design, consisting two treatments: marcha.The results submitted analysis variance means by Fisher test (P<0.05).It was concluded that most measures have similar values, however, there are differences between some angles members.

The aim of this study was to determine the favorable constant temperature range for Mahanarva spectabilis (Distant) (Hemiptera: Cercopidae) development as well generate geographic distribution maps insect pest future climate scenarios. M. eggs were reared on two host plants (Brachiaria ruziziensis (Germain and Edvard) Pennisetum purpureum (Schumach)), with individual kept at temperatures 16, 20, 24, 28, 32°C. Nymphal stage duration, nymphal survival, adult longevity, egg production recorded...

The aim of this study was to determine the damage in Brachiaria ruziziensis (Germain &amp; Edvard) according density and exposure time adults Mahanarva spectabilis (Distant, 1909) (Hemiptera:Cercopidae). Each plant kept with 0, 12, 18, or 24 M. for five ten days. Then, insects were removed from plant, following parameters evaluated: content loss chlorophyll, visual score, shoot dry mass, capability regrowth. In fact, plants exposed highest level infestation 10 days showed an 80.97% which is...

The aim of this study was to determine the damage caused by adult Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae) on Brachiaria ruziziensis (Germain & Evard) under field conditions. A total 0, 4, 8, 12, or 16 M. adults per plot were maintained for 6 days. Thereafter, insects removed from plant, and following parameters evaluated: chlorophyll content, score, dry as well fresh weights, percentage shoots' matter, forage's ability regrow. content significantly reduced; score matter...

Abstract Several herbivorous insects utilize plant chemical cues to identify hosts for feeding. The role of smell in host detection by Mahanarva spectabilis (Distant) remains largely unknown. In this study, assays were applied assess M . olfactory responses forage grasses ( Pennisetum purpureum cvs. Roxo Botucatu and Pioneiro; Panicum maximum Makueni Tanzânia; Hyparrhenia rufa cv. Jaraguá; Melinis minutiflora ; Cynodon dactylon Tifton; Brachiaria brizantha Marandú; decumbens Basilisk)....

Recently, horse breeding has achieved greater prominence in the Brazilian society and now it started to appear as a part of agribusiness. The state Minas Gerais stands out main producer equidae Brazil. aim this work was characterize State order support future researches sector. By evaluation records from 1990 2009 provided by Institute Geography Statistics (IBGE) also 967 interviews with breeders equidae, possible some important points. It observed that moves over R$1,500,000,000 per year...

This study aimed to characterize the maximum heart rate (HR) and intensity of official marcha contests (OMC) compare cost transport (COT) metabolic power (Pmet) Mangalarga Marchador (MM) horses batida (MB) picada (MP) gaits. Twenty-two MM participated in this study. The experiment was conducted 3 phases: 1) effort test (MET), 2) OMC, 3) standardized (SMT). To HR, 19 (14 MB 5 MP) underwent a MET. Of those, 13 (9 4 were monitored during which consisted stages: marcha, walk, functional trial,...

This study determined the number of spittlebug adults, Mahanarva spectabilis Distant (Hemiptera: Cercopidae), that should be used in selection tests forage grass, Brachiaria ruziziensis (Germain and Evrard). In this study, 0, 1, 2, 4, or 8 M. adults were kept plants for 4 d per experimental plot. After these periods, insects removed from chlorophyll content, damage score, dry weight, fresh percent matter shoots evaluated. Chlorophyll content decreased significantly with higher density...

Cropping practices are necessary in order to help reduce the population of pest insect, such as induction resistance through fertilization. Therefore, this study aimed assess alterations on production and quality Brachiaria ruziziensis when receiving fertilization composed by macronutrients NPK and/or exposed attack Mahanarva spectabilis nymphs adults. B. plants were fertilized according recommendation (R), half recommended (H), or non-fertilization (C). They also different M. nymph adult...

The effects of various temperatures on the development and survival Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) fed Rhopalosiphum padi (Linnaeus) (Hemiptera: Aphididae) were studied, some biological aspects among these predators compared. On average, 70 nymphs R. added to each experimental unit with predator larvae maintained at 12, 16, 20, 24, 28, or 32 °C. duration (days) (%) measured for immature stage two species....

The aim of this work was to test if egg viability polyandrous females increased with increasing number matings. Longevity and reproductive output the predatory stinkbug Podisus nigrispinus that were allowed mate for 0, 1, 2, 3 times or in continuous presence same male evaluated. Polyandry resulted diminished sperm depletion. Females had mated three a produced more offspring than once twice throughout their lifetime. There negative correlation mating history on female longevity. Results...

Journal Article Does the Silvopastoral System Alter Hymenopteran Fauna (Insecta: Hymenoptera) in Brachiaria decumbens Monocultures? Get access A. M. Auad, Auad 2 1Entomology Laboratory, Embrapa Dairy Cattle Research Center, Eugênio do Nascimento, Juiz de Fora - MG, 36038-330, Brazil. 2Corresponding author, e-mail: alexander.auad@embrapa.br. Search for other works by this author on: Oxford Academic Google Scholar A.L. F. Braga, Braga 3Entomology Department, Federal University of Viçosa,...

Collaria oleosa causes leaf injuries to the main forage grasses used for cattle feeding in Brazil. The aim of this work was determine resistance B. ruziziensis clones against C. oleosa. Eighty were maintained greenhouse, which natural infestations have been occurring previous years. After 40 days, damage score and chlorophyll content reduction assessed all clones. By using these parameters, genetic gain estimated based on REML/BLUP mixed models. We observed significant differences scores...

Abstract The predator Diomus seminulus (Mulsant) has been found frequently on forage grasses feeding of Sipha flava (Forbes), suggesting that it is a natural this aphid and potential as biological control agent for pest in Brazil. objectives study were to evaluate the effect temperature aspects D. determine whether odor used by locate prey grass infested with S. flava. We performed daily evaluations viability duration each instar larval pupal stages at 16, 20, 24, 28°C. reproductive capacity...