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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It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide. First, a survey for L. Allison Dehnel, graduate research assistant in Entomology, had primary responsibility for coordinating and conducting the research.
Third, a field survey was conducted at three prairie sites in or near Madison, each of ,ysiphlebus was visited on one to five occasions.
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The conspicuous sign of aphidiid activity is the presence of aphid “mummies” – swollen, dead aphids that have been tanned and hardened to form a protective case for the developing wasp pupa. Email alerts New issue alert. A small number of specimens tentatively identified as L. Impacts 1 Soybean aphid populations were at historic lows in the fields we monitored, with peak numbers less than 50 per plant.
Temperature is an important factor influencing the efficacy of wasps as biological controls of greenbugs. Our objective was to determine the influence of landscape structure on parasitism tesatceipes cereal aphids by L.
Parasitoid activity in the field can be monitored by looking for greenbug mummies on crop leaves. Close mobile search navigation Article navigation.
Dehnel to obtain a Masters of Science degree. Citing articles via Google Scholar. Non Technical Summary The soybean aphid is a native of Asia that was first discovered in Wisconsin in and has since spread throughout the northern soybean growing regions of North America.
Insecticides applied as sprays will kill adult wasps as well as immature wasps developing inside greenbugs killed by insecticides. The parasitoid colony will be maintained using soybean aphid as its host.
Biocontrol Agent Profile
At least one field will be used in each of 4 regions: A fungicide triadimefon; Bayleton used to control leaf rust in wheat is also very toxic to adult wasps. The wasp grub completes feedings in about days, resulting in the death of the aphid.
Greenbugs parasitized lyisphlebus L.
There are two reasons parasitoids rather than predators, the other type of natural enemy often used in biological control efforts were targeted for importation and establishment against the soybean aphid: Impacts A total of 12 confirmed Lysiphlebus testaceipes were collected during All these aphids are known hosts of L.
Soybean aphid numbers during were the lowest recorded since the discovery of the soybean aphid in Wisconsin inwhich helps explain the unusually low number of parasitoids.
Organic and conventional farmers who grow field crops are a major target for the results of this research. The parasitoid Lysiphlebus testaceipes Cresson; Hymenoptera: Correlations between parasitism and landscape variables were generally greatest at a 3. The dynamics of Lysiphlebus testaceipes in relation to aphid testacipes and other natural enemies will be inferred from the patterns that emerge across the various sites. A number of additional project objectives will be initiated duringincluding: Determine the lysiphlebua range of Lysiphlebus testaceipes and the preference of Lysiphlebus testaceipes for etstaceipes aphid hosts.
The goal of lysiplebus project is characterize aspects of the biology of Lysiphlebus testaceipes in the north central U.
Midwest Biological Control News
Related articles in Google Scholar. Normally mummies appear days after wasps lay their eggs in the greenbug.
Allison Dehnel, graduate student and research assistant, was responsible for the conduct of the research. The newly emerged wasp mates, and then begins to search for new aphids to attack. Pesticide use in wheat or grain sorghum may decrease activity of these parasitic wasps. Allison Dehnel, graduate student and research assistant, has primary responsibility for the conduct of the research.
In addition, we collaborated with the farmers who allowed us to survey for aphids and parasitoids in their soybean fields. It seems likely that Lysiphlebus testaceipes leaves soybeans late in the season and finds one or more species on which to overwinter. As many as thirteen aphid species will be tested to determine their acceptability and suitability as hosts of Lysiphlebus testaceipes.
Parasitoid development was slightly slower in soybean aphid than in the other two aphid hosts at all temperatures. Thus the target audience includes soybean farmers, but only indirectly and in the long term. 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 lyaiphlebus.