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Search Results: 1 - 10 of 601685 matches for " Panizzi A. R. "
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Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)
Chocorosqui, V. R.;Panizzi, A. R.;
Brazilian Journal of Biology , 2003, DOI: 10.1590/S1519-69842003000400012
Abstract: the influence of the photoperiod on the biology and seasonal morphs of dichelops melacanthus (dallas, 1851) was studied in the laboratory. four different photoperiods (11, 12, 13, and 14 hl = hours of light) were tested, keeping the temperature at 25 ± 1oc and the relative humidity at 65 ± 5%. nymph developmental time tended to be longer under shorter photophases (11 and 12 hl). the 14-hour photophase (long day) resulted in lower nymph mortality rates. females maintained at 13 and 14 hl showed greater weight gain (1st-28th day) than females under 12 hl. d. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hl. under 13 and 14 hl, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hl, respectively. fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. seasonal dimorphism induced by photoperiod was observed in d. melacanthus adults. under short-day conditions (11 and 12 hl), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hl), high lipid contents, and lower percentage of mature reproductive organs. under long-day conditions (13 and 14 hl), the stink bugs showed greatly developed shoulder spines, green abdomen, low lipid contents, and mature reproductive organs.
Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)
Chocorosqui V. R.,Panizzi A. R.
Brazilian Journal of Biology , 2003,
Abstract: The influence of the photoperiod on the biology and seasonal morphs of Dichelops melacanthus (Dallas, 1851) was studied in the laboratory. Four different photoperiods (11, 12, 13, and 14 hL = hours of light) were tested, keeping the temperature at 25 ± 1oC and the relative humidity at 65 ± 5%. Nymph developmental time tended to be longer under shorter photophases (11 and 12 hL). The 14-hour photophase (long day) resulted in lower nymph mortality rates. Females maintained at 13 and 14 hL showed greater weight gain (1st-28th day) than females under 12 hL. D. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hL. Under 13 and 14 hL, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hL, respectively. Fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. Seasonal dimorphism induced by photoperiod was observed in D. melacanthus adults. Under short-day conditions (11 and 12 hL), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hL), high lipid contents, and lower percentage of mature reproductive organs. Under long-day conditions (13 and 14 hL), the stink bugs showed greatly developed shoulder spines, green abdomen, low lipid contents, and mature reproductive organs.
Photophase influence on the reproductive diapause, seasonal morphs, and feeding activity of Euschistus heros (Fabr., 1798) (Hemiptera: Pentatomidae)
MOUR?O, A. P. M.;PANIZZI, A. R.;
Brazilian Journal of Biology , 2002, DOI: 10.1590/S1519-69842002000200006
Abstract: laboratory studies were conducted to verify the influence of photophase on diapause incidence in the neotropical brown stink bug, euschistus heros (fabr., 1798), fed with soybean [glycine max (l.)] merrill pods. nymphs were maintained at three different photophases: 10 h, 12 h, and 14 h, with constant temperature of 25 ± 1oc and relative humidity of 65 ± 5%. with 14 h, aproximately 100% of the adults showed mature reproductive organs; the shoulder (spine) length was significantly greater (2.96 and 2.79 mm for females and males, respectively) than those of bugs maintained at the photophase of 12 h (2.60 mm for females and males) and 10 h (2.59 and 2.53 mm for females and males). at the longer photophase (14 h), e. heros showed better reproductive performance and greater feeding activity than insects reared at 10 h and 12 h; in all photophases bugs tended to reduce feeding from the 1st to the 6th week of life. body color was considered an unreliable parameter to indicate diapause incidence. however, at 14 h, 60% of the insects were dark brown and 40% were reddish brown. these results indicate that e. heros enters reproductive diapause with photophase of 12 hours or less, showing immature reproductive organs or with intermediate development, with shoulder (spine) less developed and reduced feeding activity.
Photophase influence on the reproductive diapause, seasonal morphs, and feeding activity of Euschistus heros (Fabr., 1798) (Hemiptera: Pentatomidae)
MOUR?O A. P. M.,PANIZZI A. R.
Brazilian Journal of Biology , 2002,
Abstract: Laboratory studies were conducted to verify the influence of photophase on diapause incidence in the Neotropical brown stink bug, Euschistus heros (Fabr., 1798), fed with soybean [Glycine max (L.)] Merrill pods. Nymphs were maintained at three different photophases: 10 h, 12 h, and 14 h, with constant temperature of 25 ± 1oC and relative humidity of 65 ± 5%. With 14 h, aproximately 100% of the adults showed mature reproductive organs; the shoulder (spine) length was significantly greater (2.96 and 2.79 mm for females and males, respectively) than those of bugs maintained at the photophase of 12 h (2.60 mm for females and males) and 10 h (2.59 and 2.53 mm for females and males). At the longer photophase (14 h), E. heros showed better reproductive performance and greater feeding activity than insects reared at 10 h and 12 h; in all photophases bugs tended to reduce feeding from the 1st to the 6th week of life. Body color was considered an unreliable parameter to indicate diapause incidence. However, at 14 h, 60% of the insects were dark brown and 40% were reddish brown. These results indicate that E. heros enters reproductive diapause with photophase of 12 hours or less, showing immature reproductive organs or with intermediate development, with shoulder (spine) less developed and reduced feeding activity.
Alcaeorrhynchus grandis (Dallas): an eventual predator of Chlosyne lacinia saundersii Doubleday & Hewitson on sunflower in Northern Paraná State
Malaguido, Andréa B.;Panizzi, Ant?nio R.;
Anais da Sociedade Entomológica do Brasil , 1998, DOI: 10.1590/S0301-80591998000400024
Abstract: observou-se a ocorrência de alcaeorrhynchus grandis (dallas) (hemiptera: pentatomidae: asopinae) predando larvas da lagarta do girassol chlosyne lacinia saundersii doubleday & hewitson em girassol (helianthus annuus l.) na fazenda experimental da embrapa soja, no norte do paraná, durante janeiro-fevereiro de 1998. de ovos coletados em campo, ninfas do percevejo foram criadas em laboratório alimentadas com larvas de c. l. saundersii obtidas no campo. as ninfas também foram criadas com larvas da lagarta da soja anticarsia gemmatalis hübner obtidas em laboratório, para compara??o. nenhuma ninfa de a. grandis sobreviveu até a idade adulta, atingindo 100% de mortalidade já no 3o instar, quando alimentadas com larvas de c. l. saundersii. quando alimentadas com larvas de a. gemmatalis, 32,5% das ninfas atingiram a idade adulta. trata-se do primeiro registro deste predador associado a lagarta do girassol no norte do estado do paraná.
Danos de Euschistus heros (Fabr.) (Hemiptera: Pentatomidae) em aquênios de girassol
Malaguido, Andréa B.;Panizzi, Ant?nio R.;
Anais da Sociedade Entomológica do Brasil , 1998, DOI: 10.1590/S0301-80591998000400005
Abstract: quantitative and qualitative damage of euschistus heros (f.) to sunflower (helianthus annuus l.) seeds were evaluated in the field, at embrapa soja, in londrina, pr. cages (2.0 x 2.0 x 1.5m) were installed and covered with a nylon net containing 10 plants/cage of cv. embrapa 122-v2000. the plants were infested with 2, 4 or 8 adults of e. heros/plant, in the following periods: r3 stage (second stage of blooming with bud lenghtening) to harvest; r6 stage (final blooming) to harvest; and r9 stage (seeds physiologically mature) to harvest. test cages were kept without insects. yield (kg), weight of 1000 seeds (g), and seed germination (%) were reduced significantly with infestations of 8 bugs/plant during r3 to harvest. percentage of protein on seeds was higher, in relation to other seed components, with this same level of bug infestation and at the same plant phenological stage. however, these differences were not observed with 2 or 4 bugs/plant either at r6-harvest or r9-harvest infestation periods.
Pentatomofauna associated with sunflower in Northern Paraná State, Brazil
Malaguido, Andréa B.;Panizzi, Ant?nio R.;
Anais da Sociedade Entomológica do Brasil , 1998, DOI: 10.1590/S0301-80591998000300017
Abstract: realizou-se um levantamento das espécies de pentatomídeos associadas ao girassol (helianthus annuus l.) na regi?o de londrina, norte do paraná durante abril-maio de 1997. seis espécies foram capturadas: euschistus heros (f.), piezodorus guildinii (west.), acrosternum armigera (stal), nezara viridula (l.), thyanta perditor (f.) e thyanta sp. observou-se ninfas de quatro espécies, exce??o de p. guildinii e thyanta sp. foram coletadas posturas apenas de a. armigera.
The adequacy of artificial oviposition substrates for laboratory rearing of Piezodorus guildinii (Westwood) (Heteroptera, Pentatomidae)
Silva, Flávia A.C.;Panizzi, Ant?nio R.;
Revista Brasileira de Entomologia , 2008, DOI: 10.1590/S0085-56262008000100022
Abstract: studies in the laboratory tested the suitability of synthetic wool string, cotton string, cheesecloth, and commercial cotton ball as artificial oviposition substrates for the small green stink bug, piezodorus guildinii (westwood) (heteroptera, pentatomidae). in confined cages, 54% of total egg masses was laid on synthetic wool string, 31% on cotton string, and only 15% on cheesecloth. in an additional test, the best substrate selected, synthetic wool string, received 92% of egg masses compared to 8% on the commonly used substrate, cotton ball. synthetic wool string received the most egg masses of any size, in particular those in the range 11-20 eggs/mass. because the eggs of p. guildinii are laid in two parallel double rows, the egg masses fit the wool string perfectly.
Rostrum length, mandible serration, and food and salivary canals areas of selected species of stink bugs (Heteroptera, Pentatomidae)
Depieri, Rogério A.;Panizzi, Ant?nio R.;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000400008
Abstract: laboratory studies were conducted to compare rostrum length morphology of mandible serration and area of food and salivary canals of dichelops melacanthus (dallas) (dm), euschistus heros (f.) (eh), nezara viridula (l.) (nv), and piezodorus guildinii (westwood) (pg) (heteroptera: pentatomidae). nv showed the longest (5.9 mm) and pg the shortest (3.5 mm) rostrum length; dm and eh were intermediate. length and width of mandible tip areas holding serration was bigger for nv (106.0 and 30.2 μm, respectively) and smaller for pg (71.1 and 23.7 μm), with all species having four central teeth and three pairs of lateral teeth. the inner mandible surface showed squamous texture. cross-section of food and salivary canals (fc and sc) indicated greater area for nv and dm compared to eh and pg; however, the ratio fc/sc, yielded the highest relative area for pg.
Aging and food source effects on mandibular stylets teeth wear of phytophagous stink bug (Heteroptera: Pentatomidae)
Depieri, Rogério A;Siqueira, Fábio;Panizzi, Ant?nio R;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000600017
Abstract: studies were conducted to test the effect of age and food sources on wear of the mandibular teeth of the phytophagous pentatomid, euschistus heros (f.). the total length (μm) of the area bearing the mandibular teeth, the length of the 1st tooth, and the height of the 2nd tooth for teneral (< 1 day-old) adults were significantly greater than that of adults fed on natural [green bean, phaseolus vulgaris pods, raw shelled peanuts, arachis hypogaea, and mature soybean, glycine max seeds] for 30 or 60 days. adults fed on artificial dry diet showed, in general, similar results to those of teneral adults. force (newtons) required penetrating the natural foods was significantly greater than that required penetrating the artificial diet. the greater hardness of the natural foods caused increased mandibular serration wear.
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