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Microhabitat Selection In Two Species Of Heteromyid Rodents, Cliff A. Lemen, Michael L. Rosenzweig Apr 1978

Microhabitat Selection In Two Species Of Heteromyid Rodents, Cliff A. Lemen, Michael L. Rosenzweig

School of Natural Resources: Faculty Publications

An experiment was conducted to determine the microhabitat preferences of two heteromyid rodents, Dipodomys ordi and Perognathus flavus. This experiment used marked seeds and the atomic absorption spectrophotometer in order to study the environment as a mosaic of microhabitats. The results of our analysis indicate that these two heteromyids are microhabitat selectors. The preferences of the rodents are, D. ordi: grass habitat 0.0%, near grass habitat 22.5%, open habitat 77.4%, and P. flavus: grass habitat 46.2%, near grass habitat 32.2%, open habitat 21.4%. The overlap between the two species is only 0.43.

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Reclassification Of The Gray Wolf In The United States And Mexico, With Determination Of Critical Habitat In Michigan And Minnesota Mar 1978

Reclassification Of The Gray Wolf In The United States And Mexico, With Determination Of Critical Habitat In Michigan And Minnesota

Rocky Mountain Wolf Recovery: Annual Reports

The Service issues a final rulemaking which provides for the reclassification of the gray wolf in the United States and Mexico, and for the determination of critical habitat for species of gray wolf in Michigan and Minnesota. The reclassification is considered to accurately express the current status of the gray wolf, based solely on an evaluation of the best available biological data. The special regulations being established in Minnesota are deemed necessary and advisable to provide for the future well-being of the species. Although an increased legal take of wolves committing depredations on domestic animals will be authorized, this take …

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Volume 2, Number 3 (March 1978), The Otec Liaison Mar 1978

Volume 2, Number 3 (March 1978), The Otec Liaison

The OTEC Liaison

No abstract provided.

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Some Problems Concerning The Control Of Bird Damage In Southwestern Nigeria , M. Akande Mar 1978

Some Problems Concerning The Control Of Bird Damage In Southwestern Nigeria , M. Akande

Vertebrate Pest Conference Proceedings: 8th (1978)

The problems of controlling bird damage, especially to crops, may be both social and practical. The practical problems are subject to environmental and ecological factors. The social problems relate to lack of adequate biological knowledge of the pest species, lack of confidence between farmers and researchers, persistent government red tapes, and human feelings. Damage is often as a result of feeding and nesting activities. Control measures include both prevention of contact between birds and crops by erection of barriers, use of chemical repellents and scaring devices, and attempted reduction in numbers of pest species, by shooting and trapping. None of …

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"Vexar" Plastic Netting To Reduce Pocket Gopher Depredation Of Conifer Seedlings, Richard M. Anthony, Victor G. Barnes Jr., James Evans Mar 1978

"Vexar" Plastic Netting To Reduce Pocket Gopher Depredation Of Conifer Seedlings, Richard M. Anthony, Victor G. Barnes Jr., James Evans

Vertebrate Pest Conference Proceedings: 8th (1978)

In 1976, we began a comprehensive evaluation of "Vexar" seedling protectors as a means of reducing damage to conifer seedlings by pocket gophers (Thomomys spp.). The protectors are cylinders of plastic netting that gradually decompose in sunlight. The evaluation is being conducted on four national forests in three western states. Three conifer species, lodgepole pine (Pinus contorta), ponderosa pine (P. ponderosa), and Shasta red fir (Abies magnifica var. shastensis), are under study. After two growing seasons, gophers have caused only 5 percent mortality among "Vexar"-enclosed seedlings compared to 20 percent mortality among unprotected …

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Rodent Population Control For Public Health And Safety, Allan M. Barnes Mar 1978

Rodent Population Control For Public Health And Safety, Allan M. Barnes

Vertebrate Pest Conference Proceedings: 8th (1978)

Rodent populations - particularly those that live in close proximity to man - constitute a perennial and often severe threat to man's health as reservoirs and often as direct sources of infection for a wide variety of viral, rickettsial, and bacterial disease producing agents. The following will discuss the place of rodent population reduction for the control of plague, a bacterial disease of rodents transmitted by fleas endemic in the western United States.

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Improvements In The Use Of 4-Aminopyridine For Protecting Agricultural Crops From Birds, Jerome F. Besser Mar 1978

Improvements In The Use Of 4-Aminopyridine For Protecting Agricultural Crops From Birds, Jerome F. Besser

Vertebrate Pest Conference Proceedings: 8th (1978)

In 1976 and 1977, studies to improve the use of 4-aminopyridine (4-AP), a chemical frightening agent for protecting crops from blackbird damage, were conducted in sunflower in North Dakota, corn in Ohio, grain sorghum in Kansas, and sprouting rice in Arkansas and Texas. Because of the high vulnerability of sunflower, much of the effort was concentrated in this crop, despite the 1976 federal registration of a 4-aminopyridine product, AvitrolR FC Corn Chops-99S, in 14 midwestern states. Hand baiting the perimeter of fields appeared effective in protecting sunflowers from damage by three species of blackbirds, but was ineffective in protecting …

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Establishing Native Forbs To Reduce Black-Tailed Deer Browsing Damage To Douglas-Fir, Dan L. Campbell, James Evans Mar 1978

Establishing Native Forbs To Reduce Black-Tailed Deer Browsing Damage To Douglas-Fir, Dan L. Campbell, James Evans

Vertebrate Pest Conference Proceedings: 8th (1978)

Principal methods being used to alleviate browsing damage to Douglas-fir (Pseudotsuga menziesii) seedlings by black-tailed deer (Odocoileus hemionus columbianus) in the Pacific Northwest are animal repellents applied to foliage and plastic mesh cylinders around individual seedlings. As an alternate method, we demonstrated that prompt establishment of highly palatable native forbs reduced summer browsing on planted seedlings to the point that black-tailed deer were no longer a factor limiting Douglas-fir regeneration. We believe that establishing native forbs is a sound ecological approach to deer-reforestation problems; furthermore, it should have wide utility because it integrates forest- and wildlife-management …

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Control Of Ground Squirrels In California Using Anticoagulant Treated Baits, Dell O. Clark Mar 1978

Control Of Ground Squirrels In California Using Anticoagulant Treated Baits, Dell O. Clark

Vertebrate Pest Conference Proceedings: 8th (1978)

Anticoagulant treated grain baits have been used to control vertebrate pest depredations in California for over 30 years. The use of anticoagulant treated baits has increased seven (7) times in the past seven (7) years; the majority for the use of ground squirrel, Spermophilus spp., control. Since 1968-69, an average of 1,747,828 net over 5,700,919 gross acres per year has been treated for ground squirrel control.

Current use patterns for ground squirrel control with anticoagulant treated baits include: (1) Repeated spot baitings, and (2) exposure of bait in bait boxes.

Experimental work and many years of operational field use have …

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Conference Participants Mar 1978

Conference Participants

Vertebrate Pest Conference Proceedings: 8th (1978)

A total of 436 people registered. They came from 37 states, the District of Columbia, and 12 other countries: Canada, Egypt, England, France, Italy, Netherlands, New Zealand, Nigeria, Pakistan, Philippines, Switzerland, and Venezuela. The international representation contributed greatly to the success of the Conference by providing an exchange of information on an international level.

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Toxic Collar For Control Of Sheep-Killing Coyotes: A Progress Report, Guy E. Connolly, Richard E. Griffiths Jr., Peter J. Savarie Mar 1978

Toxic Collar For Control Of Sheep-Killing Coyotes: A Progress Report, Guy E. Connolly, Richard E. Griffiths Jr., Peter J. Savarie

Vertebrate Pest Conference Proceedings: 8th (1978)

The toxic sheep collar is the most selective method known for killing coyotes that prey on domestic sheep. The concept dates back to the early 1900's, and has been studied at the Denver Wildlife Research Center (DWRC) since 1974. Field tests with sodium cyanide (NaCN) in 1975 were unsuccessful due to repellent properties of the toxicant and to the apparent reluctance of coyotes to attack tethered lambs wearing bulky collars. Coyotes attacked one or more tethered, collared lambs in 7 of the 19 test pastures. In all, 14 collared lambs were attacked. Eight of the collars were punctured but no …

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Bird Damage Research At The University Of California, Davis, A. Charles Crabb Mar 1978

Bird Damage Research At The University Of California, Davis, A. Charles Crabb

Vertebrate Pest Conference Proceedings: 8th (1978)

The University of California, Davis, starling research program was broadened in 1976 to encompass agricultural pest birds in general. Under new direction there were a number of applied problems studied. The effects of feeding cattle only between 1600 hours and 0800 hours on cattle weight gain was studied with results indicating slower weight gains and lower meat quality when compared to cattle fed ad lib. Feed component selection by starlings (Sturnus vulgaris) was also studied finding that a starling selected diet contains a higher percentage of the high protein components than present in a commercially prepared dairy feed …

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World Bird Damage Problems, John W. De Grazio Mar 1978

World Bird Damage Problems, John W. De Grazio

Vertebrate Pest Conference Proceedings: 8th (1978)

There is a lack of information on bird-caused economic losses on a worldwide basis. Some estimates are available for specific problems in the United States, Canada, and parts of Oceania and Europe, but loss estimates are almost totally lacking in Latin America, Asia, and Africa. To justify development of control programs, it is desirable that reliable data on losses be obtained. Such data are helpful at all levels of decision-making about bird control, from research to implementation.

Bird damage situations throughout the world are similar, involving many of the same crops and genera of birds.

This report summarizes major damage …

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A Public Information Program On Predator Damage Control, David S. Decalesta Mar 1978

A Public Information Program On Predator Damage Control, David S. Decalesta

Vertebrate Pest Conference Proceedings: 8th (1978)

A public information and education program was developed in Oregon to defuse a controversy between environmentalists and livestock growers over management of predator damage control. Emphasis was placed on involving special interest and leadership/influential groups in the program and participa-tion was high. Attempts were made to involve the "general public" but response to solicitation and participation were low. Participating groups thought the program was of high value and expressed the need for additional information. Attitudes and beliefs of the special interest groups were changed little by the program, but constructive communications between the groups increased and the controversy dwindled. A …

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Brodifacoum (Talon™ Rodenticide), A Novel Concept, A.C. Dubock, D.E. Kaukeinen Mar 1978

Brodifacoum (Talon™ Rodenticide), A Novel Concept, A.C. Dubock, D.E. Kaukeinen

Vertebrate Pest Conference Proceedings: 8th (1978)

Brodifacoum, a new rodenticide, is described. This anticoagulant is shown to be of exceptional potency and capable of controlling resistant rodents as well as several non-commensal species. Results demonstrate that, in contrast to first generation anticoagulants, a bait concentration of only 50 ppm is adequate to give control and in only a single feeding for most species. In common with other anticoagulants, vitamin K1 is an effective antidote. In contrast with other acute rodenticides, symptoms are delayed and no bait shyness is observed. The results of laboratory and field trials from many parts of the world are summarized and …

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Electromagnetic Repellers—Fact Or Fiction?, William D. Fitzwater Mar 1978

Electromagnetic Repellers—Fact Or Fiction?, William D. Fitzwater

Vertebrate Pest Conference Proceedings: 8th (1978)

The effectiveness of devices that supposedly repel a large number of invertebrate and vertebrate animals by emitting oscillating electromagnetic impulses is investigated. While scientific support that electromagnetic forces affect biological systems exists, these data are based on animals confined under higher intensity fields than are seemingly produced by commercial units. A number of instances of field use of the devices is discussed. These indicate little objective support for the units.

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8th Vertebrate Pest Conference 1978 Frontmatter Mar 1978

8th Vertebrate Pest Conference 1978 Frontmatter

Vertebrate Pest Conference Proceedings: 8th (1978)

CONTENTS

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Management Of Blackbird And Starling Winter Roost Problems In Kentucky And Tennessee, Kenneth M. Garner Mar 1978

Management Of Blackbird And Starling Winter Roost Problems In Kentucky And Tennessee, Kenneth M. Garner

Vertebrate Pest Conference Proceedings: 8th (1978)

Blackbirds and starlings in winter roosts create conflict problems in five major categories: 1) Public Health, 2) Agricultural Crop, 3) Wildlife Competition, 4) Structural, 5) Safety. After identification of problems created by an individual roost and roost site, problems are solved by one or a combination of seven methods: 1) No Action, 2) Move the Roost, 3) Alteration of Agricultural Practices, 4) Bird Proofing, 5) Move Birds from Feeding or Loafing Site, 6) Population Reduction at Feedlots, 7) Population Reduction of Roosts.

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Control Of The Multimammate Rat, Mastomys Natalensis (A. Smith) In The Irrigated Fields Of The Republic Of Burundi, Jacques Giban Mar 1978

Control Of The Multimammate Rat, Mastomys Natalensis (A. Smith) In The Irrigated Fields Of The Republic Of Burundi, Jacques Giban

Vertebrate Pest Conference Proceedings: 8th (1978)

Irrigated cultivations have been developed in Burundi with the aid of the European Fund for Development. Three major rodent species are considered pests, but one of them is far more important and can survive flooding: Mastomys natalensis, the multimammate rat. The biological cycle of the species is well identified, with peak populations generally in the July-October period. A first attempt to prevent the damages consisted of slight changes in the timing of some cultivations. The second step was to find a rodenticide and a bait that could have practical use in that country. Corn paraffin blocks poisoned with chlorophacinone …

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Vertebrate Pest Control In Urban/Suburban Areas, Ronald M. Gilman Mar 1978

Vertebrate Pest Control In Urban/Suburban Areas, Ronald M. Gilman

Vertebrate Pest Conference Proceedings: 8th (1978)

Urban/suburban vertebrate pest control problems present unique challenges because of the people-afflicted environment in which they occur. People are a major consideration in effective urban/ suburban vertebrate pest control because of their emotions and changing values. Those responsible for today's vertebrate pest control must anticipate and consider this element of increasing importance and use it to their advantage rather than let it become a liability.

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Damages Caused By Cotton Rat, Sigmodon Hispidus Zanjonensis, On Sugar Cane In San Pedro Sula, Honduras , A. Gonzalez Romero, G. Tello Sandoval, J. Sernasecundino, V.M. Aguilar Ramirez Mar 1978

Damages Caused By Cotton Rat, Sigmodon Hispidus Zanjonensis, On Sugar Cane In San Pedro Sula, Honduras , A. Gonzalez Romero, G. Tello Sandoval, J. Sernasecundino, V.M. Aguilar Ramirez

Vertebrate Pest Conference Proceedings: 8th (1978)

Technical assistance was given to Compañía Azucarera Hondureña, S.A. (Agro-Industrial Co.), Honduras, Central America, to determine if a campaign against noxious rodents to agriculture crops was needed. Several trappings were carried out at different places using snap traps to determine the population structure of rodents associated with the crop, and live traps to determine the index or density of the Sigmodon hispidus rat population, which was identified as being responsible for the damage to sugarcane. Results were 43.24% adult males, 14.86% young males, 31.41% adult females, and 10.47% young females. Of the adult females captured, 54.83% were pregnant with an …

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Coyotes, Sheep And Lithium Chloride, Richard E. Griffiths Jr., Guy E. Connolly, Richard J. Burns, Ray T. Sterner Mar 1978

Coyotes, Sheep And Lithium Chloride, Richard E. Griffiths Jr., Guy E. Connolly, Richard J. Burns, Ray T. Sterner

Vertebrate Pest Conference Proceedings: 8th (1978)

The use of LiCl-treated baits and carcasses has been advocated as a means of controlling coyote predation on sheep through a process known as "aversive conditioning or taste aversion." While some investigators have made well publicized claims of damage reduction through the use of LiCl on sheep ranges, other researchers have experienced difficulty establishing prey aversion in captive coyotes. The conflicting results suggest a need for extensive, carefully controlled research in both pen and field situations before valid conclusions can be reached regarding aversive conditioning as a depredations control method.

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County Programs For Vertebrate Pest Control In California, M. Hugh Handley Mar 1978

County Programs For Vertebrate Pest Control In California, M. Hugh Handley

Vertebrate Pest Conference Proceedings: 8th (1978)

Vertebrate pest control is an important function which has been performed for many years by County Agricultural Commissioners. Since 1917, control materials have been prepared and distributed to assist farmers in the control of rodents and pest animals. Our authority for these programs comes from the California Food and Agricultural Code. It explains why this aspect of pest control is conducted by Agricultural Commissioners.

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Opening Comments—Eighth Vertebrate Pest Conference—And The Stability Of Vertebrate Populations In Man-Modified Habitats, Walter E. Howard Mar 1978

Opening Comments—Eighth Vertebrate Pest Conference—And The Stability Of Vertebrate Populations In Man-Modified Habitats, Walter E. Howard

Vertebrate Pest Conference Proceedings: 8th (1978)

Good morning. I am Professor Howard, your Conference Chairperson. Welcome to the Eighth Vertebrate Pest Conference. Vertebrate pest control has come a long way since our first two-day Conference, in 1962. An excellent meeting has been arranged by the hard-working Conference Committees and the 17 members of the Vertebrate Pest Council, who direct the Vertebrate Pest Conference. It is already a great success--because all of you are here. As I said in opening our first Conference 16 years ago, this is a Conference, not a convention. No motions or resolutions will be entertained. We are here to get acquainted with …

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Rid-A-Bird Perches To Control Bird Damage, William B. Jackson Mar 1978

Rid-A-Bird Perches To Control Bird Damage, William B. Jackson

Vertebrate Pest Conference Proceedings: 8th (1978)

Rid-A-Bird wick perches, using 9.4% endrin or 11% fenthion, may be used on a variety of structures for control of house sparrows, starlings, and pigeons. Installations take advantage of a bird's propensity to perch briefly before feeding or entering roost or nesting structures. Applications may be made to a variety of structures but are restricted from food storage or preparation areas. Additional toxicity and use research is needed.

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Anticoagulant Baiting For Jackrabbit Control, John C. Johnston Mar 1978

Anticoagulant Baiting For Jackrabbit Control, John C. Johnston

Vertebrate Pest Conference Proceedings: 8th (1978)

The jackrabbit, Lepus californicus, is properly called a hare rather than a rabbit, because the young are born fully furred and with eyes open. Hares differ from rabbits in anatomy and in the lack of burrowing, although individual hares often have a more or less regular retreat or "form" at the base of a bush or clump of grass. Jackrabbits rely upon speed and dodging to escape enemies. They live chiefly in open places, seldom inhabiting dense brush or woods.

Black-tailed hares or jackrabbits are classed as game mammals by the California Fish and Game Code, but when found …

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The Changing Rodent Pest Fauna In Egypt, A. Maher Ali Mar 1978

The Changing Rodent Pest Fauna In Egypt, A. Maher Ali

Vertebrate Pest Conference Proceedings: 8th (1978)

The most serious known rodent pests in agricultural irrigated land are: Rattus rattus, Arvicanthis niloticus and Acomys sp. Occasionally there are rodent outbreaks in agricultural plantations. The changing agro-ecosystem in the present and future agricultural plantations is expected to affect the status of the following potential rodent pest species: Spalax ehrenbergi aegyptiacus, Nesokia indica, Jaculus orientalis, and Gerbillus gerbillus gerbillus. Basic studies are needed to quantify damage including water loss, which is caused by rodents, forecast of rodent outbreaks, and integrated control of rodents in agricultural projects.

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Warfarin Baits Bagging To Control The Population Of Cotton Rats In Field Crops In Sinaloa, Mexico, C. Martinez-Palacios, C. Chavez-Sanchez, R. Ituarte-Soto, A. Marquez Moreno Mar 1978

Warfarin Baits Bagging To Control The Population Of Cotton Rats In Field Crops In Sinaloa, Mexico, C. Martinez-Palacios, C. Chavez-Sanchez, R. Ituarte-Soto, A. Marquez Moreno

Vertebrate Pest Conference Proceedings: 8th (1978)

Tests were conducted using 0.05% warfarin baits which were put into polietilinized paper bags with corn oil as attractants, in order to control cotton rats (Sigmodon hispidus major) through-out 4,000 ha. of crops in the Sinaloa State. Both the effectiveness of the warfarin bait and the security and efficiency of the handling of the polietilinized paper bags was demonstrated. Furthermore, the tests showed that there were economic advantages in using the warfarin baits instead of the zinc phosphide baits; to the extent of a 46.67% saving in the control expenses.

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Rodenticidal Activity Of Bromadiolone—A New Anticoagulant, Adrian P. Meehan Mar 1978

Rodenticidal Activity Of Bromadiolone—A New Anticoagulant, Adrian P. Meehan

Vertebrate Pest Conference Proceedings: 8th (1978)

Bromadiolone, a new anticoagulant rodenticide, has been evaluated against laboratory rats and mice. Kill of both species was excellent, even when bromadiolone was offered for only one day in the presence of alternative food. Effectiveness against homozygous warfarin resistant rats was also demonstrated. Limited field trials on farms showed that after baiting for seven days with bromadiolone, warfarin resistant rat populations were substantially reduced although subsequent re-infestation occurred. Longer or continuous periods of baiting with bromadiolone would almost certainly prevent population increase, but government restrictions on the amount of bait approved for the trials did not allow this to be …

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Vertebrate Pest Control, Where From Here?, Raymond M. Momboisse Mar 1978

Vertebrate Pest Control, Where From Here?, Raymond M. Momboisse

Vertebrate Pest Conference Proceedings: 8th (1978)

The legal and regulatory problems confronting the vertebrate pest control profession have mushroomed in recent years. The causes, the groups responsible and a suggested action plan for meeting the problem is outlined.

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