Biomedical subjects

L Wennemann

Publications and source records attributed to L Wennemann.

4 recordsLinked to original sources

PubMed2004

Movement of entomopathogenic nematodes in soils of Fragaria spp.

The mobility of three entomopathogenic nematodes (Steinernema carpocapsae UK and All Strain, and S. glaseri (Nematoda: Steinernematidae) was observed in strawberry fields in Vancouver, WA. Nematodes were sprinkled over the soil surface using a mason jar. Soil and soil-moisture content, soil composition, soil pH and conductivity was reported over the evaluation period. 12 cm deep soil samples were taken after surface application at 9 and 25 days, 7, 26 and 45 and 6, 22, 37 and 50 days at the three different test sites within the surface application site and at 5 cm distance. Soil samples taken were divided into three layers (0-4, 5-8 and 9-12 cm) and exposed once to five Galleria larvae in the laboratory to evaluate nematode presence and movement. Results after surface application demonstrated more vertical movement of S. glaseri into deeper soil layers in comparison to both S. carpocapsae strains.

Animals↗

PubMed2003

Distribution patterns of entomopathogenic nematodes applied through drip irrigation systems.

The distribution of entomopathogenic nematodes applied by drip irrigation was evaluated by injecting small volumes of Steinernema carpocapsae (Weiser) All strain, Steinernema feltiae (Filipjev) SN strain, Steinernema glaseri Steiner, and Heterorhabditis bacteriophora HP 88 strain Poinar suspensions into drip irrigation lines. Additionally, Steinernema riobrave Cabanillas, Poinar, & Raulston, and S. carpocapsae were injected in a 10-liter volume of water with an injection pump. Overall, the nematodes were evenly distributed along the drip lines. The total number of nematodes recovered from drip emitters was variable ranging from 42 to 92%. However, drip irrigation lines have potential to deliver entomopathogenic nematodes efficiently into pest habitats.

Agriculture↗

PubMed2003

Distribution patterns of MCA-coated granules aerially applied to corn fields of Southern Hungary between 2000 and 2002.

Field studies in corn (Zea mays L.) were conducted to evaluate distribution patterns of 4-methoxy-cinnamaldehyde (MCA) coated corn grits after aerial application with a Dromader fixed wing aircraft. The kairomone mimic MCA is synthetically available and a quite specific and efficient adult attractant for the invasive alien maize pest western corn rootworm (WCR) Diabrotica virgifera virgifera LeConte. Orientation disruptive properties of MCA for WCR when applied at unphysiologically high concentrations are currently under investigation. For successful implementation of the MCA disruption technique, the distribution patterns of MCA coated corn granules ('grits') in the field are important. Grits are degrained corn cobs, shredded to different sizes, coated with MCA and used as a carrier material to disseminate MCA vapors into corn fields. Granules of 10-12 mesh size were aerially applied eight times at rates ranging from 12.4 to 25.0 kg/ha. The goal is to evaluate distribution patterns of corn grits treated with MCA in three fields located at Csanadpalota, Kardoskút and Mezöhegyes in Southern Hungary between 2000 and 2002. Increasing rates reflect our attempts in finding and optimising the most even distribution of granules in the field. Field experiments were evaluated by collecting grits in 30-cm plastic saucers and by counting grits accumulated on corn plant parts. Variation in grit number per unit area and frequency of corn granule number per plant showed some transient technical application problems. Analysis of grits collected in the saucers revealed some statistical difference between the different application dates as well as differences in rates applied. Altogether grits in saucers were more evenly distributed in comparison to the grits collected on plant parts. As the corn plants age, their leaves and whorls present a smaller and smaller surface area where granules can accumulate. Altogether, however, grit distribution patterns indicate that aerial application is a viable tool for disseminating MCA in corn fields.

Acrolein↗

PubMed2001

Distribution patterns of MCA-coated corn grit formulation after aerial application to maize fields.

Field studies in corn (Zea mays L.) were conducted during the summer of 2000 to evaluate distribution patterns of corn grits treated with MCA (4-methoxy cinnamaldehyde). Aerial application was used in a 8 ha corn field situated in south-east Hungary. Corn granules ('grits') of 10-12 mesh size were applied on July 18th, August 1st and August 28th at rates of 18.3, 21.9 and 20.2 kg grits/ha and were covered with 80, 119 and 120 g MCA/ha. Experiments were evaluated by collecting grits in 30-cm plastic saucers and by counting grits accumulated on leaves and in leaf axils on corn plants. Analysis revealed a statistical difference between MCA treated and untreated grit application rates only at the first application date. Variation in grit number per unit area and frequency of corn granule number per plant showed some transient technical application problems. However, altogether, grit distribution patterns indicate that aerial application is a viable tool for disseminating MCA in corn fields. With it, orientation disruption of the introduced maize pest Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae) recently introduced into SE Europe will come within reach.

Acrolein↗