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Timestamp: 2019-04-23 02:33:16+00:00

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In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 1., 2010, Colonia de Sacramento. Abstracts? Colonia de Sacramento: Latin American Association of Chemical Ecology, 2010. p. 138.
Neotropical Entomology, Piracicaba, v. 35, n. 2, p. 279-281, Mar./Apr. 2006.
Neotropical Entomology, Piracicaba, v. 34, n. 6, p. 911-915, Nov./Dec. 2005.
Maciel, Cleber D. de G.; Velini, Edivaldo Domingues; Bernardo, Rodrigo dos S.
Mukai, L. S.; Netto, A. C.; Szabo, MPJ; Bechara, G. H.; Gibbs, EPJ; Bokma, B. H.
Acquired immunity of horses to larvae, nymphs and adults of the Amblyomma cajennense tick was evaluated through three consecutive experimental infestations of tick-bite naive hosts. Data from these infestations were compared to those from field-sensitized horses and donkeys. It was observed that tick-bite naive horses developed a low level of resistance after two infestations as shown by a significant decrease in larval yield and a tendency for lower engorged weight of nymphs during third infestation. Ticks fed on field-sensitized horses had a similar biological performance to that observed on the third infestation of tick-bite naive horses but the mean engorged nymph weight was significantly lower than that of the first infestation from tick-bite naive horses. Donkeys presented the strongest resistance with significantly lower engorged weights of all instars and of the egg mass compared to the first infestation of tick-bite naive horses. Donkeys also displayed a significantly higher resistance than field-sensitized horses as demonstrated by significantly lower egg mass weights. Overall these results indicate that donkeys but not horses maintain a strong resistance to A. cajennense ticks. The importance of these findings in relation to vectoring of tick-borne diseases is discussed. (C) 2003 Elsevier B.V. All rights reserved.
Insecticide potential and efficaciousness of vegetal extracts concentrations from six botanic families in three different modes were analyzed on the nymphs of the silverleaf whitefly Bemisia tabaci (Genn. 1889) on a tomato plantation Lycopersicon esculentum Mill. Nymph breeding was kept in cherry tomato shrubs. Test solutions were obtained from successive extractions with ethanol and evaporation in a rotary evaporator. Tests consisted of 10 solutions in four concentrations (500; 1,000; 1,500 and 3,000 μg/mL) and control treatment (distilled water + 1% DMSO) under three different modes of activity, namely, contact, translaminar and systemic. Experimental design was totally randomized with four repetitions and eleven treatments. Means were compared by Scott-Knott test at 5% probability and lethal concentrations (CL50) were calculated by POLO. In the case of contact activity mode, all extracts had efficiency above 50% with the highest concentration (3,000 μg/mL) in which the highest efficiency for all extracts tested was verified. There was a need for dose increase in translaminar activity mode for similar results, whereas in the case of systemic activity the best performance was obtained with extracts of Nerium oleander, Derris amazonica and Ipomoea carnea. Extracts of the last two caused a higher percentage when compared with that of other extracts in all activity modes lower than CL50.
Lanceleaf crotalaria, Crotalaria lanceolata E. Mey (Leguminosae) was found hosting the small green stink bug, Piezodorus guildinii (Westwood), in Paraná State, Brazil. In the laboratory, nymphs showed less mortality when fed on immature pods of crotalaria (64%) than when fed on immature pods of soybean, Glycine max (L.) Merrill (88%). From 2nd stadium to adult, nymphs required less time to complete development on crotalaria (mean of females and males = 18.4 days) than on soybean (21.5 days). Fresh body weight at adult emergence was greater on crotalaria (mean of females and males = 51.4 mg) than on soybean (42.2 mg). Adult P. guildinii tended to live longer on crotalaria than on soybean. Mean adult longevity was 34.6 days on crotalaria, and 28.8 days on soybean. However, the reproductive performance of females, although similar on both foods, tended to be greater on soybean. These results indicated that P. guildinii was able to develop and reproduce on the wild host lanceleaf crotalaria. Compared to soybean, this weed plant was more suitable for nymph development, and equally suitable for adult reproduction.
Hirose,Edson; Panizzi,Antônio R.; Cattelan,Alexandre J.
The antibiotic streptomycin added to the drinking water at a concentration of 125 mg/l during nymphal development of Nezara viridula (L.) (Heteroptera: Pentatomidae)accelerated the development in ca. 2 days, increased survivorship, and doubled adult longevity; nymph survivorship and adult body weight were not affected when compared to control insects. Streptomycin has potential in rearing N. viridula, especially in improving quality of field-collected adults, by mitigating the introduction of pathogenic bacteria, and improving the quality of the population.
In their natural environment, plants experience multiple biotic interactions and respond to this complexity in an integrated manner. Therefore, plant responses to herbivory are flexible and depend on the context and complexity in which they occur. For example, plant growth promoting rhizobacteria (PGPR) can enhance plant growth and induce resistance against microbial pathogens and herbivorous insects by a phenomenon termed induced systemic resistance (ISR). In the present study, we investigated the effect of tomato (Solanum lycopersicum) pre-inoculation with the PGPR Pseudomonas fluorescens WCS417r, on the performance of the generalist phloem-feeding insect Bemisia tabaci. Based on the ability of P. fluorescens WCS417r to prime for ISR against generalists chewing insects and necrotrophic pathogens, we hypothesized that pre-inoculated plants will strongly resist B. tabaci infestation. In contrast, we discovered that the pre-inoculation treatment increased the tomato plant suitability for B. tabaci which was emphasized both by faster developmental rate and higher survivability of nymph stages on pre-inoculated plants. Our molecular and chemical analyses suggested that the phenomenon is likely to be related to: (I) the ability of the bacteria to reduce the activity of the plant induced defense systems; (II) a possible manipulation by P. fluorescens of the plant quality (in terms of suitability for B. tabaci) through an indirect effect on the rhizosphere bacterial community. The contribution of our study to the pattern proposed for other belowground rhizobacteria and mycorrhizal fungi and aboveground generalist phloem-feeders is discussed.
Effect of resistant and susceptible soybean cultivars on the nymphal development, fecundity and mortality of Euschistus heros (Hemiptera:pentatomidae).
MICHEREFF, M. F. F.; BLASSIOLI-MORAES, M. C.; HOFFMANN-CAMPO, C. B.; DINIZ, I. R.; SILVEIRA, S.; LAUMANN, R. A.; BORGES, M.
Fonte: In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 1., 2010, Colonia de Sacramento. Abstracts? Colonia de Sacramento: Latin American Association of Chemical Ecology, 2010. p. 138. Publicador: In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 1., 2010, Colonia de Sacramento. Abstracts? Colonia de Sacramento: Latin American Association of Chemical Ecology, 2010. p. 138.
Potential use of antibiotic to improve performance of laboratory-reared Nezara viridula (L.) (Heteroptera: Pentatomidae).
HIROSE, E.; PANIZZI, A. R.; CATTELAN, A. J.
Fonte: Neotropical Entomology, Piracicaba, v. 35, n. 2, p. 279-281, Mar./Apr. 2006. Publicador: Neotropical Entomology, Piracicaba, v. 35, n. 2, p. 279-281, Mar./Apr. 2006.
Nymphal and adult performance of genetically determined types of Nezara viridula (L.) (Heteroptera: Pentatomidae), under different tempetature and photoperiodic conditions.
VIVAN, L. M.; PANIZZI, A. R.
Fonte: Neotropical Entomology, Piracicaba, v. 34, n. 6, p. 911-915, Nov./Dec. 2005. Publicador: Neotropical Entomology, Piracicaba, v. 34, n. 6, p. 911-915, Nov./Dec. 2005.
Nutritional enhancement of leaves by a psyllid through senescence-like processes: insect manipulation or plant defence?
Steinbauer, M.J.; Burns, A.E.; Hall, A.; Riegler, M.; Taylor, G.S.

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