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216 results on '"Čokl, Andrej"'

1. Potential of Biotremology for Monitoring and Control of Stink Bugs

Author

Laumann, Raul Alberto, Čokl, Andrej, Blassioli Moraes, Maria Carolina, Dias, Aline Moreira, Borges, Miguel, Janik, Vincent M., Series Editor, McGregor, Peter, Series Editor, Hill, Peggy S. M., editor, Mazzoni, Valerio, editor, Stritih-Peljhan, Nataša, editor, Virant-Doberlet, Meta, editor, and Wessel, Andreas, editor

Published
2022
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4. Stinkbugs: Multisensory Communication with Chemical and Vibratory Signals Transmitted Through Different Media

Author

Čokl, Andrej, Blassioli-Moraes, Maria Carolina, Laumann, Raul Alberto, Žunič, Alenka, Borges, Miguel, Janik, Vincent M., Series Editor, McGregor, Peter, Series Editor, Hill, Peggy S. M., editor, Lakes-Harlan, Reinhard, editor, Mazzoni, Valerio, editor, Narins, Peter M., editor, Virant-Doberlet, Meta, editor, and Wessel, Andreas, editor

Published
2019
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8. Vibrational Communication Networks: Eavesdropping and Biotic Noise

Author

Virant-Doberlet, Meta, Mazzoni, Valerio, de Groot, Maarten, Polajnar, Jernej, Lucchi, Andrea, Symondson, William O. C., Čokl, Andrej, Janik, Vincent M., Series editor, McGregor, Peter, Series editor, Cocroft, Reginald B., editor, Gogala, Matija, editor, Hill, Peggy S.M., editor, and Wessel, Andreas, editor

Published
2014
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10. Communication Through Plants in a Narrow Frequency Window

Author

Čokl, Andrej, Zorović, Maja, Kosi, Alenka Žunič, Stritih, Nataša, Virant-Doberlet, Meta, Janik, Vincent M., Series editor, McGregor, Peter, Series editor, Cocroft, Reginald B., editor, Gogala, Matija, editor, Hill, Peggy S.M., editor, and Wessel, Andreas, editor

Published
2014
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39. Female competition for availability of males in insects: the Nezara viridula (Linnaeus, 1758) model.

Author

Čokl, Andrej, Žunič Kosi, Alenka, Laumann, Raul Alberto, and Virant‐Doberlet, Meta

Subjects
*BIRDSONGS, *ANIMAL courtship, *MALES, *INSECTS, *HEMIPTERA, *STINKBUGS, *INFORMATION sharing
Abstract

Multimodal communication in solitary stinkbugs enables them to meet, mate and copulate. Many plant‐dwelling species exchange information during the calling phase of mating behavior using substrate‐borne vibratory signals. A female‐biased gender ratio induces rivalry and competition for a sexual partner. Female competition for males, first described among Heteroptera in three stinkbug species, revealed species specific differences and opened the question of plasticity in individually emitted temporal and frequency signal characteristics during calling and rival alternation. To address this question and gain an insight into the mechanisms underlying stinkbug female rivalry, we compared the characteristics of alternated signals in the southern green stinkbug Nezara viridula (Linnaeus, 1758) (Hemiptera: Pentatomidae). Compared to male rivalry, female rivalry is more complex, lasts longer and runs through successive phases by a combination of different song types. The male pheromone triggers alternation between females, producing song pulses that occasionally overlap each other. One female initiates the rivalry by changing individual pulses into pulse trains of three different types. The competing female alternates with pulses of changed temporal characteristics at lower levels of rivalry and by varying the frequency characteristics of pulse trains at higher levels. During female rivalry, the male either stops responding or occasionally emits calling and courtship signals in response to the female that has produced signals of steady temporal characteristics. Female rivalry shows complex and species specific patterns of information exchange at different levels with a broad‐range variation of temporal and frequency characteristics of, until now, unidentified vibratory emissions. [ABSTRACT FROM AUTHOR]

Published
2020
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44. Use of honeybees (Apis mellifera) to protect strawberry from grey mould (Botrytis cinerea)

Author

Bevk, Danilo, Pirc, Manca, Dreo, Tanja, Treven, Vinko, and Čokl, Andrej

Subjects
fungi, food and beverages, "Organics" in general
Abstract

BICOPOLL is a CORE Organic II European project on protecting strawberries from its most important disease, the grey mould (Botrytis cinerea). Protective spores of fungi Gliocladium catenulatum in Prestop® Mix (PM) are delivered to the flowers of strawberry by honeybees. We assessed effectiveness of honeybees as vectors under field conditions. Flower visits of bees, and fruit yield were monitored and departing and returning bees and strawberry flowers were sampled. Bees visited strawberry flowers the whole flowering period, but more abundant were in warm weather and in the afternoon. The quantity of spores on honeybees was determined by plating on media and a new method, qPCR that we have developed specifically for the protective fungi. The highest number of spores on bees was determined directly after administration of PM followed by a steady decline during the day until stabilization at a low number. The spores could also be detected in returning bees at a relatively constant low number. PM increased proportion of healthy berries for approximately 50 %. Results of first field experiment in Slovenia confirmed effectiveness of bees as vector of PM. We suggest some changes in application of PM.

Published
2014

50. Using honeybees to improve pollination of strawberries and to deliver biological fungicide for protection from grey mould (Botrytis cinerea)

Author

Bevk, Danilo, Čokl, Andrej, Bevk, Danilo, and Čokl, Andrej

Abstract

Organic berry production suffers heavily from lack of effective disease control and from inadequate insect pollination. BICOPOLL is a European study on protection of strawberries from their most important disease, the grey mould (Botrytis cinerea), using spores of fungus Gliocladium catenulatum in Prestop Mix (PM). G. catenulatum, which acts as an antagonist of grey mould, was delivered to strawberry flowers using honeybees. Bees gathered PM in a dispenser placed at the exit of the hive and delivered it to the flowers. A colony of Apis mellifera carnica honeybees was placed next to a 0.5 ha strawberry field in NW Slovenia during May and June of 2013 and 2014. Foraging activity and yield were monitored in eight experimental plots (4 treated and 4 controls) at different distances from the bee colony. Number of honeybees on strawberry flowers was counted four times a day. Bees visited the strawberry flowers despite alternative food sources close to the field. The visits were more frequent in warm weather and in the afternoons. Each year at the end of the flowering season, the healthy and the mouldy berries were collected from each plot and weighed. In 2013, the use of PM resulted in a 50% increase of the ratio of healthy berries over the mouldy ones. In 2014, no statistically significant differences between treated and untreated plots were found, presumably due to lower foraging activity of bees in cold and rainy weather in the flowering period. The results showed that, in favourable weather conditions, entomovectoring is an effective method for delivering biocontrol agents to flowers.

Published
2014

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