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Search Results: 1 - 10 of 329063 matches for " V. R.;Panizzi "
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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.
Possible egg positioning and gluing behavior by ovipositing southern green stink bug, Nezara viridula (L.) (Heteroptera: Pentatomidae)
Panizzi, Ant?nio R.;
Neotropical Entomology , 2006, DOI: 10.1590/S1519-566X2006000100022
Abstract: from march 2002 to january 2004, a colony of southern green stink bug, nezara viridula (l.), was kept in the laboratory, and its oviposition behavior was observed. during oviposition, soon after the egg is expelled, the female touches the egg mass with the dorsal surface of the last tarsomere; this movement of one leg of the hind pair occurred once. this small component of the oviposition behavior of this pentatomid is little known and not yet fully understood; it may help to position and glue the newly deposited egg to the others.
Stink bugs on soybean in northeastern Brazil and a new record on the southern green stink bug, Nezara viridula (L.) (Heteroptera: Pentatomidae)
PANIZZI, ANT?NIO R.;
Neotropical Entomology , 2002, DOI: 10.1590/S1519-566X2002000200023
Abstract: during march-april 2001, a survey of pentatomids associated with soybean [glycine max (l.) merrill] was conducted at northeastern brazil (balsas county ? maranh?o state - latitude 7°31's, longitude 46°02'w). the majority of the phytophagous bugs (82.4%) belonged to the species euschistus heros (f.). other six species of bugs were collected in much lower numbers (<5.0%). among them, the exotic species, nezara viridula (l.), was intercepted in this area for the first time, expanding its distribution in the neotropical region.
Suboptimal nutrition and feeding behavior of hemipterans on less preferred plant food sources
Panizzi, Ant?nio R.;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000100001
Abstract: phytophagous hemipterans (heteropterans) are, in general, polyphagous, feeding on a wide array of plants. among these, less preferred plant food sources are also explored as food and/or shelter. to illustrate this, i will discuss the feeding behavior of the southern green stink bug, nezara viridula (l.) (pentatomidae) on less preferred plants in northern paraná state. this bug feeds on several uncultivated-wild, and on cultivated plants, which are less preferred, changing its feeding behavior, from a typical seed/fruit sucking habit, to leaf/stem feeding, with consequences for its nymphal and adult performance. other seed suckers, such as euschistus heros (f.) and dichelops melacanthus (dallas) (pentatomidae) and neomegalotomus parvus westwood (alydidae), also change their feeding behavior from seeds to vegetative tissues (leaf, stems) when feeding on less preferred food plants. these and other mentioned examples demonstrate that for this feeding guild in particular, the less preferred food plant sources play an important role in the life history of these bugs, and that this fact is, in general, underestimated.
A possible territorial or recognition behavior of Leptoglossus zonatus (Dallas) (Heteroptera, Coreidae)
Panizzi, Ant?nio R.;
Revista Brasileira de Entomologia , 2004, DOI: 10.1590/S0085-56262004000400022
Abstract: the coreid leptoglossus zonatus (dallas, 1852) is commonly found in corn (zea mays l.) fields in brazil, and it has been observed flying and landing on objects or persons near these fields. during january, 1995, this behavior was studied in corn plantations. results indicated that the bugs concentrated on objects (plastic cylinders traps) introduced into their habitat and that their number increased during the first 24 hs. however, as time passed (8 days), this possible territorial or recognition behavior gradually decreased, and tended to disappear.
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.
Seed-carrying and feeding behavior of Jadera choprai G?llner-Scheiding (Heteroptera: Rhopalidae)
PANIZZI, ANT?NIO R.;HIROSE, EDSON;
Neotropical Entomology , 2002, DOI: 10.1590/S1519-566X2002000200022
Abstract: during february-march 2001, the seed-carrying and feeeding behavior on cardiospermum halicacabum (l.) (sapindaceae) by jadera choprai g?llner-scheiding was studied. field observations indicated that the bugs feed on seeds found on the ground. laboratory studies indicated that j. choprai may carry seeds 200 cm from where they were found. several individuals were observed feeding on one seed, with the occurrence of cannibalism. apparently, this is the first record on the association of j. choprai with c. halicacabum, and on seed-carrying by this rhopalid.
Unusual Oviposition on the Body of Conspecifics by Phytophagous Heteropterans
PANIZZI, ANT?NIO R.;SANTOS, CLAUDIA H.;
Neotropical Entomology , 2001, DOI: 10.1590/S1519-566X2001000300022
Abstract: during march 2000 and february-march 2001, the oviposition behavior on the body of conspecifics by the pentatomid euschistus heros (f.) and by the alydid neomegalotomus parvus (west.) was studied. this behavior, uncommon for the species, was observed while maintaining rearing colonies in the laboratory. apparently, this is the first record of oviposition on conspecifics by these two species of bugs in the laboratory.
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