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Number of results: 4
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Abstract

Epifaunal organisms (bryozoans, foraminifera, serpulid polychaetes, cirripeds, octocorals), scratch marks and borings (brachiopod pedicle attachment traces and gastropod, phoronid, sponge and algal boreholes) were recognized on the brachiopod shells from the Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula. They are rare and occur only on about 10% of shells. It is probable that environmental conditions were not suitable for epibionts whose requirements were to be higher than those of brachiopods. The rarity of epifauna on the dead shells can be explained by their rapid burial.

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Maria Aleksandra Bitner
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Abstract

In the climatic conditions of Lower Silesia, Poland the European corn borer lays eggs on sweet corn during 3-5 week period between the 3rd decade of June and the 2nd decade ofAugust. The eggs are laid on leaves L1 to LS ofmain and lateral stems of the plants. Caterpillars start to hatch at the beginning ofJuly, but in 1998-2000 a massive hatching was observed only in the 2nd and in the 3rd decade ofJuly, whereas in 2001 - in the 3rd decade of this month and in the l st decade of August. Larvae are capable of migrating between plant rows on the soil surface, which was observed in 1998-2000 from the end ofJuly till the end of October. Most caterpillars migrated in the 2nd and in the 3rd decade of August and in the first days of September. The cob damage by caterpillars ranged between 31 and 46%. Delayed harvest caused a substantial increase in damage.
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Authors and Affiliations

Janusz Mazurek
ORCID: ORCID
Michał Hurej
Jacek Jackowski
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Abstract

Research was carried out in 2001-2002, in the Plant Breeding Station of Mikulice near Przeworsk. The occurrence of European corn borer (Ostrinia nubilalis Hbn.) on corn, as well as the effects of its chemical control were assessed. It was found out that in 2001, caterpillars damaged 40.5% of plants, while in 2002 - 99.3% of plants. As a result of double lambda cyhalothrin application (Karate 025 EC), high pest reduction was achieved: 91.4% in 2001 and 88.9% in 2002. Corn yields increased by 1.8 t/ha in 2001 and 4.3 r/ha in 2002 in comparison with yields in untreated fields.
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Authors and Affiliations

Franciszek Lisowicz
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Abstract

The paper presents results of studies on the occurrence and economic importance of maize pests: european com borer (Ostrinia nubilalis Hbn.) and frit fly (Oscinellafri1 L.) (conducted in 1977-2000) as well as aphids (Aphididae) and thrips iThysanopterai (in I 982-1983, I 985 and 1988-2000).
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Authors and Affiliations

Franciszek Lisowicz

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