1,721,017 research outputs found
Observations on the presence of Peripsocus alboguttatus (Dalman), P. didymus Rösler, P. phaeopterus (Stephens) and P. subfasciatus (Rambur) (Psocoptera Peripsocidae) in Val Brembana
No full textDorypterix longipennis Smithers (Psocoptera: Psyllipsocidae) new species for Italy
No full textDorypteryx longipennis Smithers (Psocoptera Psyllipsocidae) specie nuova per l’Italia Prima segnalazione per l’Italia di Dorypteryx longipennis Smithers (Psocoptera Psyllipsocidae). La specie è stata trovata in un’abitazione privata appena ristrutturata– Dorypteryx longipennis Smithers (Psocoptera Psyllipsocidae) was recorded for the first time in Italy. The species was found in a private house, recently restructure
Effect of flour and pasta debris on larval development of Rhyzopertha dominica
Full text linkThe development of Rhyzopertha dominica (F.) larvae on different types of flour and on pasta debris was evaluated under laboratory condition. Tests were carried out on wheat flour, semolina, wheat bran, corn meal, corn starch, rice flour, buckwheat flour, chickpea flour, almond flour, chestnut flour, potato starch, and pasta debris. Two layers of flour or pasta debris, 3 and 6 mm high, were placed in Petri dishes and 20 first instar larvae were put into the middle of the substrate. Four replicates were carried out for each combination of substrate, particle size, and thickness of the layer. The emergence of adults was assessed daily. Chestnut flour and semolina permitted the development of larvae in a period of time similar to that observed in cereal kernels while chickpea flour and wheat flour were less appropriate food; in fact, only 25% of larvae underwent complete development into adults. In the case of corn meal, rice flour, and wheat bran, only 5% of adults emerged, while larvae were unable to develop on corn starch and potato starch. Although R. dominica is a well-known pest of pasta, pasta debris was less suitable for the development of larvae, as few adults emerged and a longer development time was observed. A three-millimeter layer of suitable food was sufficient for the development of larvae, although a higher number of adults was observed in the 6 mm layer
Development of Ephestia kuehniella (Zell.), Plodia interpunctella (Hbn.) and Corcyra cephalonica (Staint.) (Lepidoptera: Pyralidae) on kernels and wholemeals of Fagopyrum esculentum Moench and Triticum aestivum L
No full textThree stored product moth pests, Ephestia kuehniella, Plodia interpunctella and Corcyra cephalonica were reared on the following five foods: whole buckwheat with pericarp, decorticated buckwheat, wheat vat. 'Centauto' (kernels), wholemeal wheat flour and whole buckwheat flour. Results showed that achenes of buckwheat with pericarp are a poor food for the development of these species. A low rate of survival to adulthood for E. kuehniella and P. interpunctella was recorded, with a considerable extension of post-embryonic development. Although the mandibles of larvae are strong, they have trouble in breaking the fibrous buckwheat pericarp. It was observed that when the seed was decorticated there was a higher percentage of adults emerged. The emergence of E. kuehniella began, according to the food given, 34-42 days after the eggs were laid. The susceptibility index (s.i.) of achenes without pericarp (s.i. 9.7) was higher than that observed on wheat (s.i. 8.6). The first P. interpunctella adults were found after 29 days on wheat and after 56 days on buckwheat with pericarp. The shortest mean period of development occurred on wheat (34 days) while the longest was on buckwheat with pericarp at 81 days. The highest susceptibility index was on kernels (s.i. 12.8), the lowest one was on buckwheat with pericarp (s.i. 2.3). C. cephalonica began to emerge, according to the food given, after 40-55 days. In this case, fewer adults were recorded from buckwheat with pericarp, but no significant differences among the means of emerged adults on wheat, wholemeal wheat flour and whole buckwheat flour were observed. The longest mean period of development was recorded on wholemeal wheat flour (72 days) while the shortest was on wheat kernels (58 days). The highest value for the susceptibility index was obtained for wheat kernels (s.i. 7.4) and the lowest one for buckwheat with pericarp (s.i. 4.5)
Observations on Muscidifurax zaraptor Kogan & Legner and Nasonia vitripennis (Walker) (Hymenoptera Chalcidoidea Pteromalidae) parasitoids of Musca domestica L.
No full textRaccolte di Psocotteri in Lombardia
No full textVengono riportati i dati riguardanti raccolte di Psocotteri effettuate in Lombardia a partire dal 1990 fino al 2001. I luoghi di campionamento comprendono una località in pianura in provincia di Pavia, la Valtellina (So), la Val Brembana (Bg) e la Valle del fiume Adda (Lc). Sono state utilizzate per le raccolte tecniche diverse: trappola ad aspirazione tipo Rothamsted, raccolta di materiale vegetale, ombrello entomologico.
Le indagini hanno portato alla identificazione di quarantatré specie.Catches of Psocoptera in Lombardia
Data on catches of Psocoptera in Lombardia from 1990 to 2001 are reported. Surveyed localities are in the plain in Pavia province, in Valtellina (Sondrio province), Valbrembana (Bergamo province) and Adda River Valley (Lecco province).
Different methods were used for the survey: Rothamsted suction trap, plant material collection, beating tray. Forty three species were identified
Effects of temporary cooling on larvae of Idaea inquinata (Scopoli) (Lepidoptera Geometridae)
Full text linkIdaea inquinata develops on dried plants with a preference for medicinal plants. The survival of second and fourth instars larvae of I. inquinata exposed to 6 and -18±1 °C, for different periods of time, was observed. Groups of 20 larvae were placed at 6±1 °C 60±5% R.H. for periods of 15, 18, 20 and 25 days and then put in thermostatic chamber at 26±1 °C, 70±5% R.H. Tests were controlled after 1, 2, 3, 8, 15 and 23 days until adults emergence. The same procedure was used for tests at -18 °C with exposure times of 4, 8 and 24 hours.
For all the tested periods at 6±1 °C, a mortality higher than 95% was observed in second instar larvae after 1 day at 26 °C. A 100% mortality was observed on the second day at 26°C after treatment at 6 °C for 18, 20, 25, on the third day for 15 days treatment.
Few fourth instar larvae, placed for 25 days at 6 °C, were alive after 8 days at 26 °C, but they didn’t emerge as adult; when exposed for 15, 18 and 20 days few individuals developed to adult.
Larvae of I. inquinata were susceptible to the treatment at -18 °C. A 100% mortality was observed after 24 hours, when second and fourth instar larvae were treated for 4 hours at -18 °C
Climbing ability of Tribolium castaneum (Herbst) and T. confusum J. du Val on food packaging materials
No full textClimbing ability of Tribolium castaneum and T. confusum was tested by placing on wood props with different angles (0, 30, 45, 60 and 90°) stripes (5x10 cm) of packaging materials. Tests were carried out at 22±1°C and at 27 ±1°C, 60±10% r.h., in a chamber with natural light, conditions usually recorded in stores and processing departments. The two species climb corrugated paper placed on wood props with angles of 30, 45, 60, and 90°. On the other tested materials, from an angle of 30°, they showed a scarce ability to climb. Sometimes the two species appear to display different climbing ability. However this indication is not supported by the results of the statistical analysis
Development of a trap for monitoring Tribolium spp. and evaluation of the activity with different baits
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