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4 results on '"Suverkropp, B.P."'

1. Movement and host finding of Trichogramma brassicae on maize plants

Author

Suverkropp, B.P., Bigler, F., van Lenteren, J.C., Suverkropp, B.P., Bigler, F., and van Lenteren, J.C.

Abstract

Direct observation of searching patterns and residence times of Trichogramma brassicae Bezdenko on maize plants were made at 18 degrees C and 25 degrees C. Temperature had a strong effect on the residence times: parasitoids spent an average of 44.9 minutes on the plant at 18 degrees C and 20.8 minutes at 25 degrees C. Observations on single plants showed that parasitoids mainly walked from one leaf to another. The leaf part closest to the stem was the most often visited and longest searched leaf area. At 18 degrees C, many parasitoids went to the lower leaf side and stopped searching. Leaf level, leaf side or size of the leaf where the parasitoid landed had no effect on residence time. Although about 20% of total searching time was spent in following the leaf edge and mid rib, Ostrinia (Hubner) egg masses touching the mid rib were not found more often than those away from the mid rib. Host finding was also not influenced by the position of egg masses relative to the stem, or by the leaf height. Naturally laid egg masses were found twice as often as artificially placed egg masses. The scales that O. nubilalis adults left in small patches on the plant seemed to be as effective a cue as host cues artificially confined to a small area around the host egg mass. When maize plants were covered with fine netting and a number of O. nubilalis kept close to the plant for one night in such a way that the moths were unable to touch the plants, host finding and residence times of T. brassicae were significantly higher on these plants than on untreated plants. This indicates that volatile cues left by O. nubilalis had an arresting effect and were used in host finding by T. brassicae.

Published
2010

2. Host-finding behaviour of Trichogramma brassicae in maize

Author

Suverkropp, B.P., Agricultural University, J.C. van Lenteren, and F. Bigler

Subjects
maïs, parasitism, parasitisme, animal behaviour, Ostrinia nubilalis, biological control, plant pests, plantenplagen, maize, Zea mays, nuttige insecten, gastheer parasiet relaties, diergedrag, Tortricidae, Chalcididae, Laboratory of Entomology, insects, biologische bestrijding, PE&RC, host parasite relationships, Laboratorium voor Entomologie, Trichogrammatidae, insecten, beneficial insects, microlepidoptera, Eulophidae
Published
1997

4. Temperature influences walking speed and walking activity of Trichogramma brassicae (Hym., Trichogrammatidae).

Author

Suverkropp, B.P., Bigler, F., and van Lenteren, J.C.

Subjects
*TRICHOGRAMMA, *PARASITISM
Abstract

Walking speeds and walking activities (walking time divided by total time) of Trichogramma brassicae were determined at 12, 16, 20 and 25°C. Walking speed was measured during a 5-min period, and walking activity over a 4-day period. Both walking speed and walking activity were strongly influenced by temperature. Walking speed increased linearly with the temperature and was twice as high at 20 as at 12°C. At 25°C, walking activity was high during the whole day, at 20 and 16°C it decreased during the afternoon, whereas at 12°C the wasps became most active only at noon or later. At low temperatures, there was a strong individual variation in walking activity. At 25°C, T. brassicae was active most of the time, so the area searched per time unit can only increase at temperatures above 25°C if walking speed increases. At temperatures below 20°C, searching was more restricted by low walking activity than by low walking speed. Even disregarding other effects of temperature, the reduction in walking speed and walking activity at suboptimal temperatures means that T. brassicae can only search half of the area at 20°C, and only one-seventh at 15°C that it can search at 25°C. [ABSTRACT FROM AUTHOR]

Published
2001
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