Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 29

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  insect inhabiting
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Among the thrips species feeding on pea plants, the most numerous were: Thrips fuscipennis – occurring on green parts of plants and flowers, Frankliniella intonsa – occurring on flowers and a polyphagous species Thrips tabaci. These species were observed on pea plants from the first decade of May to the end of harvest.The greatest number of thrips was recorded in the first decade of June. Among the recoded species Aeolothrips intermedius was also numerous. This species is a zoophagous however, its larvae can prick and suck plant tissues, especially flowers.
Over 2007–2008 in kujawsko-pomorskie voivodeskie, the study Province was carried out into the species composition, abundance and dominance of butterfly cartepillars (Lepidoptera) feeding on 4 populations of dwarf everlasts Helichrysum arenarium (L.) Moench. The research showed that the plants were infested with butterflies representing the following families: Bucculatricidae, Coleophoridae, Lasiocampidae, Noctuidae, Nymphalidae, Pyralidae and Tortricidae. In the studied habitats the most common were: Bucculatrix gnaphaliella, Eublemma minutata, Pyrausta aerealis, Coleophora gnaphalii, Vanessa cardui and caterpillars from the genus Cnephassia.
Obiekt prezentowanych badań stanowiła populacja kapturnika zbożowca (Rhyzopertha dominica F.), groźnego szkodnika magazynowanego ziarna zbóż i produktów spożywczych. Czynne przemieszczanie się osobników dorosłych tego gatunku po gładkiej powierzchni nie jest możliwe z powodu budowy ich ciała, jednak bardzo sprawnie poruszają się w obrębie pryzm ziarna. Wykazują, podobnie jak populacje innych chrząszczy spichrzowych, dużą aktywność migracyjną. Celem badań laboratoryjnych było zbadanie przebiegu procesu migracji w początkowym okresie zasiedlania ziarna pszenicy przez tego szkodnika. Ocenę aktywności migracyjnej oparto na analizie liczebności populacji oraz wskaźników: migracji, śmiertelności i struktury płciowej. Jako substrat w eksperymentach zastosowano pszenicę - optymalny pokarm dla tego gatunku owada. Badania prowadzono w temperaturze 28°C i RH 60 ±5 %. Stwierdzono, że rozprzestrzenianie się populacji kapturnika zbożowca w warunkach swobodnych migracji dwukierunkowych w początkowym okresie zasiedlania pokarmu prowadzi do szybkiego, równomiernego opanowywania całego dostępnego substratu. Ponadto samice tego gatunku wykazują wyższą aktywność migracyjną. Prowadzi to do rozprzestrzeniania się populacji i atakowania coraz to nowego ziarna zbóż. Stwierdzonej aktywności migracyjnej towarzyszy bardzo niska śmiertelność populacji.
In 2008–2009 on ornamental grasses in nurseries and the Botanical Garden in Bydgoszcz eighteen species of the Auchenorrhyncha and fifteen species of Heteroptera were found. The most numerous were: Javesella pellucida (F.), Psammotettix confinis (Dhlb.), Stenocranus major (Kbm.) and Macrosteles laevis (Ribaut) (Auchenorrhyncha) and Trigonotylus caelestialium (Kirk) and Stenodema laevigata (L.) belonging to Heteroptera.
Susceptibility of different sugar beet cultivars to larva damage caused by the third generation of beet fly (Pegomya hyoscyami Panz.) was tested in the field condition in 2008 and 2009. The effect of the pest damage on yield was estimated. Twenty four cultivars were tested in one location in 2008 (Piołunowo). Ten cultivars were tested in four locations in 2009 (Tytlewo, Tylice, Piołunowo, Zbójno). Experiments were designed by randomized blocks in four replications. Estimation of damage was done in the end of September using a six degree scale where: 1 – means very slight damage, 5 – heavy damage. The level of infection was calculated as a percentage. Yield was estimated on each plot by digging beets from 10 m2 area. Analysis of variance and correlation was done at p < 0.05. Significant differences in susceptibility of sugar beet cultivars to damage cause by beet fly larvae were stated. The level of damage ranged from 10% (cultivar Balladyna) to 45% (cultivar Picasso) in 2008. Six cultivars was weakly damaged, sixteen moderately, and two strongly. No significant correlation between leaf damage and root yield (r = 0.194, N = 24, p = 0.928). The average damage level was from 12% (cultivar Nancy) to 36.6% (Aldona) for four experiments in 2009. Damage level was week for two cultivars, moderate for six, and strong for two. Lack of correlation between root yield and damage level was stated. The obtained results revealed that sugar beet protection against the third generation of P. hyoscyami is pointless in case of a low or moderate level of damage.
During the last 20 years, Polish scientific papers on crop protection were rarely dealt with migration biology and crops’ infestation by arthropods. In presented paper research methods of insect’s migration were discussed as well as difficulties in statistical inference based on the migratory behaviour of oilseed rape pests (SADIE). Studying arthropods migrations by comparing groups of measuring points parallely placed in increasing distances from the edge of field, is not very useful. Such approach considers a priori a regular insects movement into crop canopy. Presented results, are based on research conducted earlier.
The confused flour beetle is one the most common pest insects invading stored food products with high content of starch. The object of the studies was to determine the adaptability of the pest to infest different quality groups of wheat grain divided into grain size fractions. Survivability of the confused flour beetle taking into consideration the quality and quantity of nutrient substance was studied; as well as the course and length of this developmental cycle. The results of performed studies revealed that a wheat cultivar factor significant affected development of the pest. It was also stated that pest beetles preferred grain of wheat cultivars with low protein content and pure technological quality of gluten. In contrast, grain of cultivars characterized by a high technological quality such as Korweta and Jasna were more tolerant to infestation by this pest.
In the years 2008–2009 the susceptibility of 18 cultivars and lines of red beet to plants’ infestation and colonization by aphid Aphis fabae was estimated. In the case of tested beet cultivars and lines, the percentage reduction of yield (root weight) in relation to the number of feeding aphids was also determined. Three lines of red beet (DZE IV F1, SKB F1, and NOE) revealed a high degree of resistance to aphid A. fabae infestation and feeding. The development of large and very large (43–120 and above 120 individuals per plant) aphid colonies, and 60–70% of colonized plants were recorded on three cultivars (Opolski, Karmazyn, and Astar F1) and on one EO/1 line. On the same breeding materials of beet, the greatest losses in root yield (more than 23%) were also recorded.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.