Entomology Commons^™

Hatching Of Sod Webworm Eggs In Relation To Low Temperatures, E. A. Heinrichs, Ellis L. Matheny

Department of Entomology: Faculty Publications

Eggs of Chrysoteuchia topiaria (Zeller), Crambus pascuellus floridus (Zeller), and Pediasia trisecta (Walker) were exposed to temperatures of 25, 15, 10, 4, and –10°C. Only those of P. trisecta hatched after exposure to 4°C for 30 days, while none hatched after exposure to –10°C. Eggs of none of the species hatched after exposure to 4 and 10°C for 60 days. Pre-exposure and post-exposure conditioning had no significant effect on percent hatch of P. trisecta eggs, while length of exposure period had a significant effect.

Lipid Content And Seasonal Activity Of Odontopus Calceatus (Coleoptera: Curculionidae) Adults, E. A. Heinrichs

Department of Entomology: Faculty Publications

Overwintering Odontopus calceatus (Say) adults were first observed feeding on April 10. Weekly collections during the activity period indicated that new-generation adults began emerging June 4. By July 23 they had entered the forest litter for hibernation. Lipid content decreased throughout the hibernation period as the weevils utilized 77% of their total lipid content during this time. The most rapid decrease during hibernation occurred from February to March, just prior to mating and oviposition in the spring. No increase in lipid content occurred during the activity period in spring and summer. A great increase in lipid content did occur within …

Effects Of Metepa On Gametogenesis And Embryogenesis In The Large Milkweed Bug Oncopeltus Fasciatus (Dallas), Donald E. Lawson, Harold J. Ball

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

Considerable research is currently being directed toward discovering means of controlling insects other than by applying insecticides. There are several promising concepts of control which minimize the use of insecticides and one of these is the use of sterilizing techniques. Some emphasis is currently being placed on the development of chemosterilant techniques. Many of the studies have been concerned with the screening of potentially active chemicals, whereas other research has dealt with the efficacy of field application. The more basic work has been accomplished through the participation of several disciplines. The purpose of this study was to characterize the effects …

Tb39: Canada Plum, Prunus Nigra Aiton, As A Primary Host Of The Green Peach Aphid, Myzus Persicae (Sulzer), In Northeastern Maine, W. A. Shands, Geddes W. Simpson, H. E. Wave

Technical Bulletins

Studies were conducted to determine the role of Canada plum as a host of the green peach aphid in northeastern Maine and to assess its importance as a source of infestation by the aphid on potatoes. The results relate chiefly to chronological and phenological aspects of the use of Canada plum as a primary host of this aphid; temperature developmental requirements of the aphid on this plant in spring; productiveness of spring migrants of the aphid in thickets and in cages; interrelationships between fall aphid populations on foliage, and egg deposition and overwintering to naturally occurring aphid colonies in spring …

The Intestinal Flora Of Triatoma Protracta Protracta (Uhler) (Hemiptera: Reduviidae) Including New Bacterial Isolation Techniques, Stephen A. Nyirady

Loma Linda University Electronic Theses, Dissertations & Projects

A bacteriological procedure for the removal of the intestinal flora of Triatominae is described. Immersion of Triatoma protracta adults and fifth instar nymphs in 5% aqueous formaldehyde for three hours was sufficient to free the integument of these insects of viable bacteria without penetration into the alimentary tract.

Twenty-two adults and 17 fifth instar nymphs of Triatoma protracta protracta were collected from Neotoma lodges in southern California. Eleven of the 17 nymphs molted into adults in the laboratory. With the use of a 2% peracetic acid sterilized custom built plastic germ-free isolator the Triatoma were dissected and various sections of …

Let's Control Swarming, William P. Nye, George F. Knowlton

All PIRU Publications

No abstract provided.

Food Preference As A Factor In Distribution And Abundance Of Phoetaliotes Nebrascensis, K. P. Pruess

Department of Entomology: Faculty Publications

Western wheat grass, Agropyron smithii, was the plant most frequently ingested by Phoetaliotes nebrascensis (Thomas) in 4 of 5 habitats and was preferred in all. All grasses were eaten to some extent; nonpreferred plants may support populations in otherwise suitable habitats. Most forbs were unattractive but all tested species of Cichoriaceae were acceptable. Plant-finding was by random searching; selection was made only after contact through the mouthparts. While habitats in which preferred hosts were more abundant had higher grasshopper populations, annual changes in grasshopper abundance within a habitat were independent of abundance of primary food plants.

An Analysis Of Gene-Enzyme Variability In Natural Populations Of Drosophila Melanogaster And D. Simulans, Stephen J. O'Brien, Ross J. Macintyre

Biology Faculty Articles

Nine populations of D. melanogaster and two populations of D. simulans were analyzed for polymorphism in 10 gene-enzyme systems by the technique of gel electrophoresis. In the eight natural populations of D. melanogaster, an average of 54% of the enzymes were polymorphic, and the average heterozygosity was 22.7%. An experimental population of D. melanogaster, which has been maintained in a laboratory cage for 20 years, showed levels of polymorphism equivalent to those of natural populations. The D. simulans populations had much less variability. The possible factors involved in maintaining these polymorphisms are discussed.

A National Program Of Research For Bees And Other Pollinating Insects And Insects Affecting Man, U.S. Department Of Agriculture

An

The United States Department of Agriculture and State Agricultural Experiment Stations are continuing comprehensive planning of research. This report is a part of this joint research planning and was prepared under recommendation 2 (page 204, paragraph 3) of the National Program of Research for Agriculture.

The Biology And Ecology Of Trogoderma Glabrum (Herbst) In Stored Grains, Benjamin H. Kantack, Robert Staples

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

These investigations were undertaken to determine the distribution and importance of Trogoderma glabrum (Herbst) in stored grain in Nebraska, the ecological factors favoring population increase in stored wheat, corn, and sorghum, and the role T. glabrum might play in disseminating internally the Aspergillus molds commonly encountered in stored grain.

Northern And Western Corn Rootworms In Minnesota, H. C. Chiang, R. G. Flaskerd

Journal of the Minnesota Academy of Science

The occurrence and population changes of the northern corn rootworm, Diabrotica longicornis (Say), and the western corn rootworm, D. virgifera LeConte, were reviewed on the basis of information assembled at the Department of Agriculture of the State of Minnesota; and the Department of Entomology, Fisheries, and Wildlife and the Extension Entomologist's Office of the University of Minnesota.

The review shows no record of the northern species in Minnesota before 1899, but it appeared between 1899 and 1915. Populations were probably very law until 1932. Sporadic infestations were reported between 1932 and l 953. Progressive increase in infestation from 1954 paralleled …

Protein Patterns Of Dragonfly Hemolymph As Shown By Gel Disc Electrophoresis, Myron Anderson, Lee Halgren, Louis Nuti

Journal of the Minnesota Academy of Science

Acrylamide gel disc electrophoresis of the hemolymph of nymphs of the families Libellulidae and Aeschnidae showed a difference in the mobility of their protein components. Simultaneous comparisons of Anax iunius, Aeschna umbrosa, and Libellula pulchella gave clear separation of the species. Changes in protein composition associated with stage of nymphal development and transition from nymph to adult were apparent.

Mayfly Cholinesterase: Solubilization And Partial Purification, Burton C. Lidgerding, Donald J. Kraft

Journal of the Minnesota Academy of Science

A method hos been developed for the solubilization of cholinesterase from whole mayflies (Hexagenia bilineata, Soy). Solubilization is enhanced through the use of: (1) protamine sulfate, (2) sephadex, (3) sodium taurocholate, and (4) ammonium sulfate-sodium bicarbonate treatments. Partial purification of the enzyme is also reported. Fractions representing a final activity of 246 units and a purification factor of 17.79 are presented.

The Biology And External Morphology Of Bees With A Synopsis Of The Genera Of North-Western America, W. P. Stephen, George E. Bohart, P. F. Torchio

All PIRU Publications

No abstract provided.

A New Species Of Dufourea From California *Hymenoptera: Halictidae), George E. Bohart

All PIRU Publications

No abstract provided.

Phoretic Behavior Of Four Species Of Alkali Bee Mites As Influenced By Season And Host Sex, Earle A. Cross, George E. Bohart

All PIRU Publications

No abstract provided.

Pieridae Of Arkansas, E. Phil Rouse

Journal of the Arkansas Academy of Science

No abstract provided.

Fossil Phylloxerid Plant Galls From The Lower Eocene, Eugene B. Wittlake

Journal of the Arkansas Academy of Science

No abstract provided.

Spiders Collected From Mud-Dauber Nests In Clark County, Arkansas, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

No abstract provided.

A New Rhinoceros From The Nebraska Miocene, Lloyd G. Tanner

Bulletin of the University of Nebraska State Museum

A new species of rhinoceros, Menoceras marslandensis, is here proposed. It is based upon a nearly complete skull from the upper part of the Marsland Formation, Hemingford Group (Miocene), of Box Butte County, Nebraska. The new species was probably derived from Menoceras arikarense (Barbour), collected from the Agate Springs Quarries (Arikaree Group, Harrison Formation) of Sioux County, Nebraska, with which both Diceratherium niobrarensis Peterson and D. cooki Peterson are likely synonymous. From Menoceras arikarense, the presumed ancestral stock, Menoceras marslandensis differs in possessing the following characters: (1) very long, fused but slightly cleft, nasals, with flattened, rugose areas …

Selective Breeding Of Honeybees For Alfalfa Pollen Collection: Sixth Generation And Outcrosses, O. Mackensen, William P. Nye

All PIRU Publications

No abstract provided.

Addition To The List Of Spiders Collected In Clark County, Arkansas, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

No abstract provided.

Control Of Insects In Cotton, D G. Shedley, D. L. Hardy, P. J. Michael

Journal of the Department of Agriculture, Western Australia, Series 4

Results of two experiments at the Ord Irrigation area in 1968 indicate that farmers may be spending more than necessary to obtain economic control of cotton pests in some seasons.

One experiment clearly demonstrated the relationship between low insect numbers and improved cotton yields—the second indicated that a moderate but well timed spray schedule, especially during the early part of the season, can result in more economic insect control than an intensive spray schedule.

Simple Treatment Will Protect Farm-Stored Grain, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

WITH unusually large quantities of grain likely to be stored on farms this season, 1970 will be an important year for the control of pests in stored grain.

Infested grain from farms is responsible for almost all outbreaks of infestation in bulk storages, leading to costly treatment by the grain handling authority. Effective control on the farm would eliminate most of this.

Lupins In Western Australia. 3. Cultivation Methods Continued, John Sylvester Gladstones

Journal of the Department of Agriculture, Western Australia, Series 4

THE characteristics of the lupin varieties grown in Western Australia were described in the first two articles of the series (Journal of Agriculture, August and September, 1969), together with recommendations for growing bitter sandplain lupins.

This article gives general recommendations for growing grain lupins, and discusses the main diseases and pests of lupins in Western Australia and their control.

A Comparison Of Silphids Taken From Covered And Uncovered Carrion (Coleoptera : Silphidae), Brett C. Ratcliffe, Robert J. Luedtke

University of Nebraska State Museum: Entomology Papers

As an extension of the silphid research by the senior author, an experiment was conducted to ascertain the differences, if any, in silphid species that would be attracted by placing covered and uncovered animal carcasses in the field. A review of the literature indicated that nothing has been published in this regard.

In eastern Nebraska silphids are very active in the spring, their numbers being greater at this time of year than at any other. University of Nebraska Entomology Museum records show that 14 species have been taken in Lancaster County.

Two tests were conducted at Steven's Creek, three miles …