1,721,005 research outputs found
Susceptibility of different kinds of powdered milk to the attack of Pyralid moths
No full textTest were carried out to determine the susceptibility of four different kinds of powdered milk, used in human nourishment to attack by Cadra cautella (Walk.), Corcyra cephalonica (Staint.), Ephestia kuehniella (Zell.) and Plodia interpunctella (Hbn.). One hundred eggs, 24-48 h old, were placed on substrates (50g) in a thermostatic room (26±1°C; 70±5% r.h.; 16:8 L:D). For each substrate, three replicates were carried out. At the end of each test the mean adult number emerged, the mean developmental period and the mean susceptibility index was calculated. Results were subjected to ANOVA and to the Duncas’ multiple range test (SPSS 11.5 for Windows).
Test species were able to complete their development on soya milk. On this substrate, emergence of 50-60 individuals were observed except for C. cephalonica where there were 19.0±1.00 emerged adults. C. cautella, E. kuehniella and P. interpunctella were not able to complete their development on the human nourishment milk (powdered whole milk, powdered reconstituted milk and powdered baby milk). C. cephalonica adults were observed not only on powdered soya milk but also on whole milk, numbers of adults that emerged were: 17.0±1.21 from powdered baby milk: 40.7±3.84 from reconstituted milk: 32.0±2.00). C. cephalonica showed the ability to use lactose, as an energetic source. This sugar, in fact, for the most part is toxic to the moths and beetles of stored products
Susceptibility of some dried medicinal plants to attack of Oryzaephilus surinamensis (L)(Coleoptera Silvanidae)
No full textConsiderazioni sulle preferenze alimentari di Idaea inquinata (Lepidoptera Geometridae) per la messa a punto di una dieta artificiale
No full textAttività di ricerca per il miglioramento delle trappole per Tribolium castaneum e T. confusum
No full textEffectiveness of 1,8-cineole (Eucalyptol) against Plodia interpunctella (Hbn.) (Lepidoptera Pyralidae)
No full textAttività di Plodia interpunctella (Hbn.) in presenza di imballaggi flessibili in polipropilene biorientato.
No full textInsecticidal activity of 1.8-cinole against Plodia interpunctella (Hbn.) (Lepidoptera Pyralidae)
No full textEffect of particle size of soft wheat flour on the development of Ephestia kuehniella Zeller (Lepidoptera : Pyralidae)
Full text linkThe effect of soft wheat flours, characterized by different particle size, protein and starch content, on the development of Ephestia kuehniella was studied. The attractiveness of the Substrata to first and third instar larvae was also considered.
The different protein content of the flours did not significantly affect the development of E. kuehniella, nor did it affect the ability of the flours to attract larvae. In tests with soft wheat flours. with the same nutritional value but different particle size, the highest mean number of adults and the shortest developmental period were recorded on samples with greatest particle size (250-419 mu m). In order to test the attractiveness of soft wheat flour to larvae, a one-way olfactometer was used. There were no significant differences observed in the number of first and third instar larvae found on flours with different protein composition and particle size. Larvae of this species show limited mobility, in fact few individuals of either instar can reach the flour from a distance of 2 m. No larvae of either instar contacted the different substrata from a distance of 2.5 m
Capture unevenness of a flour beetle trap
No full textIdaea 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
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