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Articles 45031 - 45060 of 52552
Full-Text Articles in Physical Sciences and Mathematics
Unmasking Mascall's Mouse Traps, David C. Drummond
Unmasking Mascall's Mouse Traps, David C. Drummond
Vertebrate Pest Conference Proceedings: 15th (1992)
Twelve mouse traps described and figured by Leonard Mascall in 16th Century England are illustrated and interpreted afresh. Special attention is given to one that is also depicted on the Merode altarpiece, an important 15th Century Dutch painting. Since Mascall's era many of his mouse traps have virtually disappeared. Others have been made more effective by various design changes, including the incorporation of small powerful helical springs and improved release mechanisms, and by the greater use of wire mesh and sheet metal.
The Evaluation Of Alternative Toxins To Sodium Monofluoroacetate (1080) For Possum Control, Charles T. Eason
The Evaluation Of Alternative Toxins To Sodium Monofluoroacetate (1080) For Possum Control, Charles T. Eason
Vertebrate Pest Conference Proceedings: 15th (1992)
Possum control in New Zealand is dependent on the use of sodium monofluroacetate (1080) and cyanide. Although 1080 is highly effective, its use is restricted to government staff. Cyanide is available for a wider group of licensed operators, but cyanide "shyness" reduces its effectiveness. An acute toxicity program has been set up to identify nonanticoagulant toxins that could be used safely by farmers. Dose-ranging studies showed that possums are susceptible to cholecalciferol, calciferol, gliftor, alpha-chloralose, and nicotine, but not to bromethalin. As lethal doses for these toxins have been ascertained, which of them are likely to be cost-effective and safe …
Toxic Bait And Baiting Strategies For Feral Cats, Charles T. Eason, David R. Morgan, B. Kay Clapperton
Toxic Bait And Baiting Strategies For Feral Cats, Charles T. Eason, David R. Morgan, B. Kay Clapperton
Vertebrate Pest Conference Proceedings: 15th (1992)
To improve feral cat control we developed a dry pelleted toxic bait and evaluated the potential of lures. A polymer fish meal bait was preferred by cats from a range of bait types tested. L-alanine further increased bait acceptance by cats in pen trials and catnip may have the potential to increase field acceptance and target specificity. An oral LD90 of 0.38 mg/ kg was established for sodium monofluoroacetate (1080) in feral cats voluntarily eating surface-loaded baits. Acute toxicity to cats of warfarin, cholecalciferol, and gliftor was tested. However, because the cat proved highly sensitive to 1080, we recommend …
High Frequency Sound Devices Lack Efficacy In Repelling Birds, William A. Erickson, Rex E. Marsh, Terrell P. Salmon
High Frequency Sound Devices Lack Efficacy In Repelling Birds, William A. Erickson, Rex E. Marsh, Terrell P. Salmon
Vertebrate Pest Conference Proceedings: 15th (1992)
Ultrasonic or high-frequency sound-producing devices are marketed as a scaring or frightening method for bird control. Although inaudible to humans, most birds also do not hear in the ultrasonic frequency ranges of above 20,000 Hz, thus the credibility of advertised claims raises questions. A review of efficacy studies conducted and published by a number of researchers fails to demonstrate the usefulness of such bird control devices.
An Integrated Approach To The Management Of Urban Canada Goose Depredations, Steven D. Fairaizl
An Integrated Approach To The Management Of Urban Canada Goose Depredations, Steven D. Fairaizl
Vertebrate Pest Conference Proceedings: 15th (1992)
Canada geese (Branta canadensis) in the Reno-Sparks, Nevada urban area have become a problem of increasing significance. Nuisance complaints from city parks, golf courses, and housing developments augment the bird hazard to aircraft operations at the local airport. Eleven goose collisions with commercial aircraft, between January 1986 and April 1989, caused $250,000 in structural damages but no injuries or loss of human life. The Federal Aviation Administration required action be taken to reduce the hazard if airport certification was to continue. A multi-agency task force was formed to develop and implement an integrated pest management plan. Population surveys …
The Starling In Europe: Multiple Approaches To A Problem Species , Chris J. Feare, Pierre Douville De Franssu
The Starling In Europe: Multiple Approaches To A Problem Species , Chris J. Feare, Pierre Douville De Franssu
Vertebrate Pest Conference Proceedings: 15th (1992)
In Europe, Starlings are widely distributed and comprise both resident and migrant populations. These cause various kinds of damage which varies with the crops grown in different European Economic Community (EEC) countries. Although EEC member states are governed by the same legislation on bird protection, each state interprets the Community legislation in its own national legislation. This leads to different national approaches to the prevention of Starling damage, with little information exchange between member states. The establishment of an EEC (or wider) working group on bird pests is recommended to coordinate research and development.
Interactive Computer Kiosks For Vertebrate Ipm—Status Report, Stephen C. Frantz, Robert M. Durlak
Interactive Computer Kiosks For Vertebrate Ipm—Status Report, Stephen C. Frantz, Robert M. Durlak
Vertebrate Pest Conference Proceedings: 15th (1992)
The recent outbreak of raccoon rabies in New York State during a period of unprecedented fiscal constraints presents an emerging organizational dilemma—how to handle increasing demands for services in an environment of diminishing resources. As one response to this need, the New York State Department of Health (DOH) is developing an interactive computer system for integrating public education, professional training and public/professional communication. The basic objective is to enhance consumer access to information regarding rabies, Lyme disease and other public health issues; thereby, forming the basis for prevention. In essence, this effort can be classified as an “educational intervention,” the …
Front Matter And Contents
Vertebrate Pest Conference Proceedings: 15th (1992)
Contents:
Avitrol Use In The Protection Of Wine Grapes From The House Finch (Linnet) In Sonoma County, Pierre Gadd
Avitrol Use In The Protection Of Wine Grapes From The House Finch (Linnet) In Sonoma County, Pierre Gadd
Vertebrate Pest Conference Proceedings: 15th (1992)
Two field trials were conducted to determine the effectiveness of Avitrol® (4-aminopyridine) mixed grains 0.50% in the repelling of house finches (Carpodocus mexicana) from two vineyards in Sonoma County. In the first trial, two properties were prebaited for twelve and fourteen days respectively. After the removal of the prebait, Avitrol treated grain mixture was then placed in the bait troughs for a period of from two to four days. A count of the house finch (linnets) number visiting the troughs during the prebaiting and treatment phases of the trial was recorded. Subsequent linnet counts were made to determine …
A Review Of The Results From Laboratory Tests Of Some Rodenticides Against Eight Rodent Species, J.E. Gill
A Review Of The Results From Laboratory Tests Of Some Rodenticides Against Eight Rodent Species, J.E. Gill
Vertebrate Pest Conference Proceedings: 15th (1992)
The susceptibility of eight rodent species to a range of widely used and candidate rodenticides was determined in laboratory feeding tests. No choice and choice tests were used to assess toxicity and effect on palatability of the rodenticides to Meriones shawi (Shaw's gerbil), Arvicanthis niloticus (Nile rat), Acomys cahirinus (Egyptian Spiny mouse), Mastomys natalensis (Multimammate rat), Sigmodon hispidus (Cotton rat), Rattus exulans (Polynesian rat), and R. rattus (Ship rat) which responded differently to each chemical. The results of these tests suggest possible rodenticides suitable for control of each species. Field trials are now needed to assess the effectiveness of these …
Urban Crow Roosts In California, W. Paul Gorenzel, Terrell P. Salmon
Urban Crow Roosts In California, W. Paul Gorenzel, Terrell P. Salmon
Vertebrate Pest Conference Proceedings: 15th (1992)
We reviewed the historical and current status of the American crow (Corvus brachyrhynchos), urban crow roosts and control efforts in California. Crows aggregate in traditional winter roosting areas. In the late 1930s most crows in California roosted in the Sacramento Valley in rural locations. Crow roosts were not a concern except for potential damage to adjacent farmlands. From the 1960s through 1980s crows colonized urban areas for nesting and winter roosting. A phone survey of vertebrate pest management officials indicated all known roosts were in urban areas, with most occurring in the Sacramento Valley. From 1970 to 1989 …
Metoclopramide Hydrochloride Did Not Prevent 1080-Induced Vomiting In Coyotes, Jeffrey S. Green
Metoclopramide Hydrochloride Did Not Prevent 1080-Induced Vomiting In Coyotes, Jeffrey S. Green
Vertebrate Pest Conference Proceedings: 15th (1992)
Vomiting is a characteristic, although undesirable effect when using Compound 1080 (sodium monofluoroacetate) as a method of predator control for coyotes. Compound 1080 meat baits with (treatment) and without (control) an antiemetic, metoclopramide hydrochloride (MH), were fed to captive coyotes to determine whether MH would prevent vomiting. All treatment and control animals died as a result of consuming the 1080 bait with no difference between the groups in time from bait consumption to death. There was no significant difference between the number of treatment and control animals that vomited after consuming the baits. Likewise there was no difference between the …
Reinfestation Of Bandicota Bengalensis (Gray) In Irrigated Field Habitat, B.K. Guruprasad
Reinfestation Of Bandicota Bengalensis (Gray) In Irrigated Field Habitat, B.K. Guruprasad
Vertebrate Pest Conference Proceedings: 15th (1992)
Bandicota bengalensis, a predominant species inhabiting irrigated fields is a potential pest on agricultural crops and is known to live in extensive burrow systems. The burrow opening covered with mud which is an indicator of its activity seems to be discontinuous. An analysis of burrow systems and their occupations indicated reuse of abandoned burrow systems by new entrants. A study simulated in semi-natural conditions supported the view that there is occupation of old burrows by new immigrants. Non-effective barriers; and availability of Panicum repens on bunds, a food alternative may support the population influx. Availability of old burrow systems …
Forty Five Years Of Anticoagulant Rodenticides — Past, Present And Future Trends, Malcolm R. Hadler, Alan P. Buckle
Forty Five Years Of Anticoagulant Rodenticides — Past, Present And Future Trends, Malcolm R. Hadler, Alan P. Buckle
Vertebrate Pest Conference Proceedings: 15th (1992)
The anticoagulant rodenticides were discovered in the 1940s and their advantages of efficacy and safety quickly resulted in their use dominating the practice of rodent control in temperate countries. However, the development of resistance to the early compounds within a decade stimulated research culminating in the invention of anew class of anticoagulant, the second generation compounds, active against resistant strains but also overall far more potent than those previously available. A novel baiting strategy, pulsed baiting, was developed to make full use of this valuable characteristic. Pulsed baiting has enabled the use of second generation anticoagulants in situations where early …
Closing Remarks For The Fifteenth Vertebrate Pest Conference, Wendy S. Halverson
Closing Remarks For The Fifteenth Vertebrate Pest Conference, Wendy S. Halverson
Vertebrate Pest Conference Proceedings: 15th (1992)
As chair-elect for the 16th Vertebrate Pest Conference it is my responsibility to provide the closing remarks for this conference. In achieving this objective I would like to accomplish three things: summarize the 15th conference, leave you with some thoughts to take home, and provide information and an invitation to the 16th Vertebrate Pest Conference to be held in 1994. At this conference, over the last three days, eighty-one papers have been presented. There were 327 registered participants representing eleven foreign countries and thirty-two states. I would like to take this opportunity to acknowledge the individuals who have worked very …
California Ground Squirrel Field Efficacy Study Using 0.005% Chlorophacinone Bait, Brent Hazen, Richard M. Poche
California Ground Squirrel Field Efficacy Study Using 0.005% Chlorophacinone Bait, Brent Hazen, Richard M. Poche
Vertebrate Pest Conference Proceedings: 15th (1992)
A field efficacy study was completed using Wilco Ground Squirrel Bait (containing 0.005% chlorophacinone) to control California ground squirrels (Spermophilus beecheyi) in Madera County, California. Bait was applied in plastic stations at the rate of 2 lbs. per station. Two plots with buffer zones were treated (about 11.5 acres each). Visual and burrow counts were used as the census indices to determine field efficacy. Pretreatment and posttreatment census observations were conducted over three days pretest and three days posttreatment. Efficacy after 21 days was 94.4% for plot T-l and 100% on plot T-2 using visual counts. Burrow count …
Impacts Of House Mouse Activity On Five Types Of Insulation, Scott E. Hygnstrom
Impacts Of House Mouse Activity On Five Types Of Insulation, Scott E. Hygnstrom
Vertebrate Pest Conference Proceedings: 15th (1992)
House mice (mus musculus) cause a variety of problems with livestock, feed, and structures. Researchers have yet to discover an insulative material that is not susceptible to house mouse damage. In this study, house mice caused significant (P < 0.01) increases in the thermal conductance of 10.2-cm thick wall panels, insulated with cellotex, fiberglass, rockwool, styrofoam, and vermiculite. Mouse populations increased 3-to 4-fold inside the insulated panels during the 6-month study period.
Vertebrate Pesticides No Longer Registered And Factors Contributing To Loss Of Registration, William W. Jacobs
Vertebrate Pesticides No Longer Registered And Factors Contributing To Loss Of Registration, William W. Jacobs
Vertebrate Pest Conference Proceedings: 15th (1992)
Many pesticide chemicals once used to control vertebrate pests are no longer registered in the U.S. Changes in pesticide laws and regulations have played a major role in the loss of vertebrate pesticides, but relatively few products, uses, or compounds have been lost because the U.S. Environmental Protection Agency (EPA) determined that they were too hazardous to be registered. Most canceled products, use patterns, and chemicals have been lost because their registrants abandoned them, choosing not to pay the fees or data development costs necessary to maintain registrations. Pesticide users or other interested parties may be able to "save" a …
Improved Aerosol Methodology For Applying Cpt To Control Roosting Species Of Pest Birds, Brad E. Johns, R. Daniel Thompson, Kenneth A. Crane
Improved Aerosol Methodology For Applying Cpt To Control Roosting Species Of Pest Birds, Brad E. Johns, R. Daniel Thompson, Kenneth A. Crane
Vertebrate Pest Conference Proceedings: 15th (1992)
Colony roosting species of blackbirds (Icterinae), including European starlings (Sturnus vulgaris), can be significant pests. The chemical avicide CPT has been applied experimentally in the U.S. and France to roosting blackbirds. However, apparent effective aerial application rates are high, 44-101 kg/ha (40-90 lbs/a), and the actual efficacy, expressed as percent mortality, is difficult to determine. We assessed CPT as a respirable aerosol for potential use as a roost avicide. Starlings exposed to 17 ppm CPT for 5.5 min received lethal doses. The birds appear very sensitive to CPT administered in this manner. The methods of CPT entry into …
Evaluations Of Aversive Agents To Increase The Selectivity Of Rodenticides, With Emphasis On Denatonium Benzoate (Bitrex®) Bittering Agent, Dale E. Kaukeinen, Alan P. Buckle
Evaluations Of Aversive Agents To Increase The Selectivity Of Rodenticides, With Emphasis On Denatonium Benzoate (Bitrex®) Bittering Agent, Dale E. Kaukeinen, Alan P. Buckle
Vertebrate Pest Conference Proceedings: 15th (1992)
Aversive agents are proposed as potential additives to rodenticides to increase selectivity to the target species. Examples of various aversive agent categories are given, including odorants, tastants, and emetics, with examples of evaluations. Tastant additives have been found that do not interfere with rodenticidal efficacy. Denatonium benzoate (commercially available as Bitrex®) is an intensely bitter but non-toxic substance, being increasingly used to adulterate common household materials to reduce the potential risks involved with accidental exposures. No known prior research results have been published concerning the incorporation of Bitrex in rodenticides. Rate determination studies utilizing different rodenticidal formulations were conducted. A …
The Field Rat Control Campaign, Chiapas, Mexico, Gillian E. Key, Romeo De La Piedra Constantino
The Field Rat Control Campaign, Chiapas, Mexico, Gillian E. Key, Romeo De La Piedra Constantino
Vertebrate Pest Conference Proceedings: 15th (1992)
The Secretariat for Rural Development of the State Government of Chiapas, southern Mexico, has been charged with conducting a campaign against the field rat which began in February 1991. Four areas were identified as key sites for the campaign benefiting 3,355 farmers in a total area of 8,000 ha and an initial budget of approximately $500m Mexican pesos (US $170,000). The major crops for which damage is reported are maize, sugar cane and cacao. The term “field rat” is a general one encompassing any rodent causing damage to field crops and in Chiapas probably covers a variety of species; no …
Nontarget Hazards Associated With Egg Baits Used To Control Corvid Depredations On Endangered California Least Tern Eggs At Camp Pendleton, California—1990 (Abstract Only), C. Edward Knittle
Nontarget Hazards Associated With Egg Baits Used To Control Corvid Depredations On Endangered California Least Tern Eggs At Camp Pendleton, California—1990 (Abstract Only), C. Edward Knittle
Vertebrate Pest Conference Proceedings: 15th (1992)
Several small nesting colonies of the endangered California least tern (Sterna antillarum browni) remain along the California coast. The largest of these is located on Camp Pendleton Marine Base in southern California. Many forms of disturbance have apparently contributed to the decline of this tern species, including corvid, primarily raven (Corvus corax), predation on the eggs. Efforts to eliminate corvid predation have primarily focused on shooting offending birds; this method is selective, but it has inherent public safety problems. In 1988, biologists from the Denver Wildlife Research Center (DWRC) and the U.S. Navy, in cooperation with …
Which Useful Toxicological Information Can Be Drawn From Studies On The Hepatic Fixation Of Anticoagulant Rodenticides, J.C. Lechevin, A. Vigie
Which Useful Toxicological Information Can Be Drawn From Studies On The Hepatic Fixation Of Anticoagulant Rodenticides, J.C. Lechevin, A. Vigie
Vertebrate Pest Conference Proceedings: 15th (1992)
Anticoagulant rodenticides act at the hepatic level where they are more or less fixed according to their lipophilic nature. The studies on kinetics and metabolism carried out with no toxic doses are useful to know how products act but do not allow to anticipate the toxicity risks for non target species, because of low residual contents. These risks can only be assessed after the administration of toxic doses taking into account the residue levels. The use of half-life to express the results is not sufficiently accurate and may lead to wrong conclusions. The studies involving the residue and secondary toxicity …
Laboratory Studies Of More Durable Baits For Controlling Pocket Gophers, Ling Ling Lee, Walter E. Howard, Rex E. Marsh
Laboratory Studies Of More Durable Baits For Controlling Pocket Gophers, Ling Ling Lee, Walter E. Howard, Rex E. Marsh
Vertebrate Pest Conference Proceedings: 15th (1992)
A laboratory study of 68 Botta's pocket gophers (Thomomys bottae) was carried out to compare the preference for 20 different nontoxic baits and the preference and efficacy of 14 different toxic baits. All baits were designed to be more durable (i.e., longer lasting) than loose grain baits to increase the chance that one baiting might successfully control any new gopher invader that moved into an unoccupied burrow system. Bait types ranged from pure paraffin cubes, polyethylene bags of grain bait (plain or coated with paraffin and carrot powder), and paraffin grain baits (3.4 g and 10 g). Wide …
Electronic Frightening Devices For Reducing Coyote Predation On Domestic Sheep: Efficacy Under Range Conditions And Operational Use, Samuel B. Linhart, Gary J. Dasch, Richard B. Johnson, Jerry D. Roberts, C. Joe Packham
Electronic Frightening Devices For Reducing Coyote Predation On Domestic Sheep: Efficacy Under Range Conditions And Operational Use, Samuel B. Linhart, Gary J. Dasch, Richard B. Johnson, Jerry D. Roberts, C. Joe Packham
Vertebrate Pest Conference Proceedings: 15th (1992)
A portable 12-v battery-operated coyote frightening device was developed for reducing coyote predation on sheep and evaluated on fenced pasture farm flock operations (1979-1982). In 1986, the final experimental model consisted of a PVC case, a timer, a blinking strobe light, and a warbling type siren that was activated for 7-10 seconds at about 6-7 minute intervals throughout the night. The devices were generally suspended about 2 m above the ground and were activated at dusk by a photocell and turned off about 2 hours after dawn by a timer. Here we report tests on high mountain summer sheep ranges …
Progress On Managing Cattail Marshes With Rodeo® Herbicide To Disperse Roosting Blackbirds, George M. Linz, David L. Bergman, William J. Bleier
Progress On Managing Cattail Marshes With Rodeo® Herbicide To Disperse Roosting Blackbirds, George M. Linz, David L. Bergman, William J. Bleier
Vertebrate Pest Conference Proceedings: 15th (1992)
In August and September 1989 and 1990, we aerially sprayed 8 cattail (Typha spp.) marshes with Rodeo® herbicide to begin evaluating its use for fragmenting dense cattail stands used by roosting blackbirds (Icterinae). Treated marshes were effectively eliminated as roost sites for blackbirds. After 2 years, cattail densities in 4 marshes treated with Rodeo® at 5.8 - 7.0 L/ha were 87% lower than pretreatment densities (P = 0.0001). In 1990, we treated 4 marshes with Rodeo® at 4.7 L/ha. One year later, 6% of the cattails survived in the sprayed areas. Of 7 groups of "indicator birds," only marsh …
Scarecrows And Predator Models For Frightening Birds From Specific Areas, Rex E. Marsh, William A. Erickson, Terrell P. Salmon
Scarecrows And Predator Models For Frightening Birds From Specific Areas, Rex E. Marsh, William A. Erickson, Terrell P. Salmon
Vertebrate Pest Conference Proceedings: 15th (1992)
Scarecrows and raptor models are fairly common traditional methods of attempting to frighten unwanted birds. Their effectiveness depends on the conditions under which they are used and the unwanted bird species involved. Best results are obtained from those that are most lifelike and have motion. When coupled with loud startling sounds or recorded distress calls their effectiveness is generally enhanced. Habituation by at least some birds is inevitable so the duration of effectiveness diminishes with time. It is essential to know what works best in a given situation so those methods can be employed to achieve maximum efficiency. An understanding …
Reflections On Current (1992) Pocket Gopher Control In California, Rex E. Marsh
Reflections On Current (1992) Pocket Gopher Control In California, Rex E. Marsh
Vertebrate Pest Conference Proceedings: 15th (1992)
Rodenticide options for pocket gopher control are more limited now than anytime in the last 40 years. Strychnine remains the most economical and efficacious of the rodenticides available for use in production agriculture and forestry. The anticoagulant rodenticides, diphacinone and chlorophacinone, provide the best alternative to strychnine where the latter is thought inappropriate (e.g., school grounds, parks, etc.). The development of a behavioral type resistance to strychnine baits is currently jeopardizing control on certain ranches. Perishable baits (e.g., cubed raw carrots) are no longer an option because technical or concentrated strychnine is no longer registered for such uses. The development …
Nonlethal Repellents: The Development Of Cost-Effective, Practical Solutions To Agricultural And Industrial Problems, J. Russell Mason, Larry Clark
Nonlethal Repellents: The Development Of Cost-Effective, Practical Solutions To Agricultural And Industrial Problems, J. Russell Mason, Larry Clark
Vertebrate Pest Conference Proceedings: 15th (1992)
Repellents substances and devices cause pest species to avoid otherwise attractive or palatable materials. For birds, repellents can be visual, auditory, pyrotechnic, tactile, chemosensory, physiologic, or physical. Here, we consider chemical agents only. Few substances are registered with the U.S. Environmental Protection Agency (EPA), and thus legally available for use. This lack of available bird repellent technology reflects the small demonstrable economic impact of many agricultural bird damage problems. Accurate information about damage and market size is virtually nonexistent, and private companies are reluctant to invest resources in the unknown. To successfully commercialize new repellents, clearly lucrative markets must be …
Studies On Bait Preference And Acceptance Of Flocoumafen In Rattus Rattus Infesting Poultry Farms And Godowns, Manju Mathur, A.P. Jain, Nisha Kashyap, Farzana Parveen
Studies On Bait Preference And Acceptance Of Flocoumafen In Rattus Rattus Infesting Poultry Farms And Godowns, Manju Mathur, A.P. Jain, Nisha Kashyap, Farzana Parveen
Vertebrate Pest Conference Proceedings: 15th (1992)
The black rat (Rattus rattus) has global distribution with 570 forms (Walker 1940). However, in India it is represented by 16 sub-species (Biswas and Tiwari 1969) with R.r. rufescens as most common commensal rodent (Barnett and Prakash 1975). It distinctly occupies rural and urban areas in Rajasthan. Besides infesting human dwellings rats occupy poultry farms, godowns, shops, flour mills, etc. With increase in poultry farming the rat problem has become critical and so is the fate of farm produce being stored at farmers’ godowns which are small, non-scientifically constructed and nonrodent proof. Often it is recommended that poultry …