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Search Results: 1 - 10 of 110327 matches for " Jovenil José da;Chocorosqui "
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Danos do percevejo barriga-verde Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) em trigo
Manfredi-Coimbra, Silvana;Silva, Jovenil José da;Chocorosqui, Viviane Ribeiro;Panizzi, Ant?nio Ricardo;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000600003
Abstract: the objective of this study was to evaluate the reaction of two cultivars of wheat to the damage caused by adults of the green belly stink bug, dichelops melacanthus (dallas), confined on the culture from the beginning of tillering. the effect of different infestation levels (0, 2, 4, 8 and 16 bugs m-2) on the number of tillers m-2, number of spikes m-2, weight of 1,000 seeds (g), and yield (kg ha-1) was evaluated on wheat cvs. ?br 18' and ?brs 193', in londrina, paraná state. the number of tillers m-2 increased linearly on ?br 18' and in a quadratic form on ?brs 193', with the increase of the number of bugs m-2; the number of spikes m-2, the weight of 1,000 seeds, and the yield decreased linearly with the increase of the infestation level on both cultivars. ?brs 193' was the most susceptible to the attack of d. melacanthus, showing a reduction of 254.4kg for each unit of increase in the number of bugs m-2.
Danos do percevejo barriga-verde Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) em trigo
Manfredi-Coimbra Silvana,Silva Jovenil José da,Chocorosqui Viviane Ribeiro,Panizzi Ant?nio Ricardo
Ciência Rural , 2005,
Abstract: O objetivo deste estudo foi avaliar a rea o de dois cultivares de trigo aos danos causados por percevejos adultos de Dichelops melacanthus (Dallas), confinados sobre a cultura a partir do início do perfilhamento. Foram comparados os efeitos de diferentes níveis de infesta o (0, 2, 4, 8 e 16 percevejos m-2) sobre o número de perfilhos m-2, número de espigas m-2, peso de mil sementes (g) e rendimento (kg ha-1) das cultivares ?BR 18' e ?BRS 193' de trigo, em Londrina, PR. O número de perfilhos m-2 cresceu linearmente para a cv. ?BR 18' e de forma quadrática para a cv. ?BRS 193' com o aumento do número de percevejos m-2; o número de espigas m-2, o peso de mil sementes, e o rendimento decresceram de forma linear com o aumento do nível de infesta o para as duas cultivares. ?Acv.BRS 193' foi mais suscetível ao ataque de D. melacanthus, apresentando uma redu o de 254,4kg para cada unidade de aumento no número de percevejos m-2.
Neotropical brown stink bug (Euschistus heros) resistance to methamidophos in Paraná, Brazil
Sosa-Gómez, Daniel Ricardo;Silva, Jovenil José da;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000700019
Abstract: the objective of this work was to evaluate the soybean neotropical brown stink bug (euschistus heros) resistance to methamidophos through laboratory bioassays. bioassays were carried out using populations of adults and nymphs of euschistus heros in the last instar collected in soybean crops in paraná state. highest frequencies of genotypes resistant to methamidophos were observed in alvorada do sul, toledo and nova santa rosa, pr. populations from bela vista do paraíso, araruna, campo mour?o, mariluz, cascavel, s?o jo?o do ivaí, and mamboré were more susceptible to methamidophos. however, an increase on resistant genotypes in this locations cannot be discarded.
Attraction of Neomegalotomus parvus (Westwood)(Heteroptera: alydidae) to cow urine and ammonia
Silva, Jovenil José da;Arruda-Gatti, Iara Cintra de;Mikami, Adriana Yatie;Pissinati, Aline;Panizzi, Ant?nio Ricardo;Ventura, Mauricio Ursi;
Scientia Agricola , 2010, DOI: 10.1590/S0103-90162010000100012
Abstract: the alydid bug parvus (westwood) is not easily detected in the field and the discovery of attractants may be a suitable way to monitor this species. the attraction of n. parvus to traps (transparent, transparent green and yellow) baited with cow urine and ammonia was studied in two field trials. traps were placed near a terrace with pigeon pea plants (cajanus cajan l.). tap water, nacl 10% aqueous solution (w/v), cow urine, and ammonia (nh4oh 1% aqueous solution) were tested as attractants in yellow, transparent and transparent green traps. green traps baited with cow urine caught more bugs than yellow and transparent traps (3.2 and 7.2 times more, respectively), and more bugs than traps of the same color with just water (no captures) or nh4oh solution (14.5 times more). traps baited with ammonia caught more bugs than traps with water: 14.4, 4.7 and 6.7 times more than transparent green, yellow, and transparent traps, respectively, or nacl solution: 3.9, 7.6 and 6.2 times, respectively. both ammonia and cow urine are attractive to n. parvus and may be tested to monitor the bugs in the field.
New records of pentatomids as hosts of Hexacladia smithii ashmead (Hymenoptera: Encyrtidae) in southern Brazil
Panizzi, Ant?nio R;Silva, Jovenil J da;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000400034
Abstract: adults of the tomato stink bug, arvelius albopunctatus (de geer), from pasture lands at londrina, paraná state (latitude 23o 18' s; longitude 51o 09' w) and of dichelops furcatus (f.) (heteroptera: pentatomidae) from field crops at cruz alta, rio grande do sul state (latitude 28o 38' s; longitude) southern brazil were parasitized by hexacladia smithii ashmead , which are set as new host records for this parasitoid.
Preda??o de pupas de Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) por larvas e adultos de Calosoma granulatum Perty (Coleoptera: Carabidae) em laboratório
Chocorosqui, Viviane R.;Pasini, Amarildo;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000100008
Abstract: the predation capacity of larvae and adults of calosoma granulatum perty on alabama argillacea (hübner) pupae was studied under laboratory conditions. in the first experiment, each larva of c. granulatum (n=18) was provided with five pupae of a. argillacea per day; in the second experiment, five pupae per day were given to each c. granulatum adult (n= five males and five females). their predation rate was 1.8 pupae per day. the highest level of predation occurred from the end of the second instar to the beginning of the third instar. their predation rate for adults was 1.5 and 1.7 larvae per day, for males and females, respectively. there was no significant difference between male and female predation capacity in all evaluations. these results indicate that c. granulatum larvae and adults may prey on relatively high numbers of a. argillacea pupae, and therefore, the preservation of this predator on cultivated areas is essential to reduce the number of insecticide sprays and, consequently, the cost of production per hectare.
Nymph and adult biology of Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) feeding on cultivated and non-cultivated host plants
Chocorosqui, Viviane R.;Panizzi, Ant?nio R.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000400001
Abstract: the biology of the pentatomid dichelops melacanthus (dallas) feeding on cultivated and non-cultivated plants was studied in the laboratory. nymph mortality varied from ≈ 60 on corn (seed mature) to 77% on wheat (ear immature); no nymphs survived on seedlings of corn or wheat. nymph developmental time on soybean, corn or wheat (seed, pod or ear) varied from 25.5 to 32.8 days. body weight at adult emergence was similar and greater on most foods than on wheat ear. nymphs fed preferentially on soybean (pod immature). on non-cultivated hosts, nymphs showed high mortality (73%) on crotalaria (pod immature); on tropical spiderwort (stem) all nymphs died. nymphs took longer time to develop on crotalaria and/or on spiderwort than on soybean. body weight at adult emergence did not differ on crotalaria or soybean. survivorship decreased with time on most foods, with ≈50% of adults alive at day 30. on corn and wheat seedlings ≈80% of adults were dead on day 20. adult longevity ranged 31-43 days, except on corn and wheat seedlings < 15 days. females % ovipositing peaked (≈76%) on soybean (pod or seed immature), and was minimum (≈9%) on wheat ear (immature); no females reproduced on seedlings of corn or wheat. preoviposition period was shorter (≈12 days) on soybean (immature pod or seed) and longer (≈37 days) on wheat (ear immature). fecundity was similar and higher on all foods than on wheat (ear immature). body weigh gain occurred on all foods, but on corn and wheat seedlings. adults fed preferably on soybean (pod immature and seed mature); wheat (seedling) was the least preferred food.
Impact of cultivation systems on Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) population and damage and its chemical control on wheat
Chocorosqui, Viviane R.;Panizzi, Ant?nio R.;
Neotropical Entomology , 2004, DOI: 10.1590/S1519-566X2004000400014
Abstract: results of field evaluations indicated that the neotropical pentatomid dichelops melacanthus (dallas) is associated with wheat, triticum aestivum l. in the no-tillage cultivation system, adults and nymphs were mostly found on the soil, near the plant stems and underneath crop residues of the preceding summer crop, usually soybean, glycine max (l.) merrill, or corn, zea mays l. wheat grown under the conventional cultivation system showed minimal bug attack. d. melacanthus caused substantial damage to no-tillage wheat plants, particularly to seedlings. bug attack reduces the number of seed heads of up to 34%. seed yield was reduced in 31% due to the bugs' feeding, compared to plants free of damage. all developmental phases of the wheat plant were susceptible to the attack of d. melacanthus, and the greatest yield reduction occurred from stem elongation (26.5%) to milky grain stage (33.1%). seed treatment using insecticides was efficient, greatly reducing the grain production losses.
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.
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