PDF | Fauna of aphidiine parasitic wasps has been intensively studied in the past 20 years in Serbia. Lysiphlebus testaceipes, a species introduced originally to. The aphid parasitoid Lysiphlebus testaceipes is a potentially valuable biological control agent of Aphis gossypii a major worldwide pest of cotton. One means of. Lysiphlebus testaceipes, a native parasitoid with an unusually broad host range of over aphid species, has become increasingly abundant, to the point that.

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Periodic sampling of soybeans will be conducted in various geographic regions in Wisconsin.

Thus the target audience includes soybean farmers, but only indirectly and in the long term. Normally mummies appear days after wasps lay their eggs in the greenbug. Significant correlations between parasitism by L.

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Parasitoids are tiny non-stinging wasps that lay their eggs in aphids, and the wasp larva devours the aphid and pupates within the aphid shell known as a “mummy”. Lysiphlebus testaceipes likely does not overwinter in association with soybean aphid. Wasp parasites contribute to greenbug suppression in two ways. Hyperparasite attack may reduce the effectiveness of L.

Impacts 1 Soybean aphid populations were at historic lows in the fields we monitored, with peak numbers less than 50 per plant. Research Effort Categories Basic. Pesticide Susceptibility Pesticide use in wheat or grain sorghum may decrease activity of these parasitic wasps.

Midwest Biological Control News

In addition, we collaborated with farmers who graciously allowed us access to their soybean fields. Samples are still being processed to determine final numbers. The objective of this research is to gain a better understanding of the behavior and ecology of a native aphid parasitoid, in hopes that we might better be able to utilize it for biological control of the the exotic soybean aphid.


Parasitoids were reared at constant temperatures of 12, 16, 20, 24, or 28 degrees C. Allison Dehnel, graduate student and research assistant, was responsible for the conduct of the research.

This project provided the opportunity for Ms. Another target is the community of UW researchers and extension specialists with interest in soybean aphid management and in organic agriculture. Correlations between parasitism and landscape variables that would be expected to increase with increasing landscape diversity were usually positive.

Each field will be sampled at weekly or biweekly intervals, with the following information recorded on at least 25 soybean plants: It seems likely that Lysiphlebus testaceipes leaves soybeans late in the season and finds one or more species on which to overwinter. The female wasp inserts an egg into the greenbug and in about 2 days a tiny wasp grub hatches and feeds internally on the living aphid.

Nothing significant to report during this reporting period. This aphid can build up to populations exceeding 1, per soybean plant and as a result can cause significant yield loss. Colonies of corn leaf aphid and English grain aphid were initiated with early summer collections from local wheat fields. In no-choice assays, parasitoids were presented with individuals of a single aphid species on the appropriate plant. The overall objective of this research was to gain a better understanding of the behavior and ecology of a native aphid parasitoid, in hopes that we might better be able to utilize it for biological control of the the exotic soybean aphid.

Natural Enemies Gallery: Lysiphlebus testaceipes–UC IPM

Publications No publications reported this period. Any mummies remaining in a soybean field would be crushed during the harvesting procedure, and the soybean aphid leaves soybean in the fall and colonizes buckthorn, where males and sexual females mate and the females lay overwinter eggs.

Oxford University Press is a department of the University of Oxford.

Non Technical Summary The soybean aphid is a native of Asia that was first discovered in Wisconsin in and has since spread throughout teetaceipes northern soybean growing regions of North America. Third, a field survey was conducted at three prairie sites in or near Madison, each of which was visited on one to five occasions. Relative Effectiveness Wasp parasites contribute to greenbug suppression in two ways.


Developmental rate at each temperature will be regressed against temperature, and the developmental threshold will be estimated. Impacts 1 Average numbers of soybean aphids remained below the economic threshold of aphids per plant all three summer, with the highest aphid populations occurring in and very few aphids occurring in soybeans during the drought conditions experienced in Lysiphlebuz aphids tested will include corn leaf aphid, English grain aphid, bird cherry oat aphid, green peach aphid, potato aphid, pea aphid, and a variety of other aphids in the genus Aphis, many of which occur on native prairie plants.

Email alerts New issue alert. Thus it is conceivable that Lysiphlebus testaceipes is adapting to take advantage of the availability of the recently introduced soybean aphid. Lysiphlebus testaceipes adult emerging from aphid mummy.

A major effort toward biological control of the soybean aphid was also launched, which has sought to import and establish “parasitoids” to help control soybean aphid populations. Both no-choice and choice assays were conducted. Parasitoid development pysiphlebus slightly slower in soybean aphid than in the other two aphid hosts at all temperatures.

Genetic Structure of Liriomyza trifolii Diptera: Teataceipes larva cuts a hole in the bottom of the aphid, attaches the aphid to a leaf with silk and a glue, and the dead greenbug changes color from green to a brown “mummy”.