Perceived damage and areas of needed research for wildlife pests of California agriculture.

Many wildlife species cause extensive damage to a variety of agricultural commodities in California, with estimates of damage in the hundreds of millions annually. Given the limited availability of resources to solve all human-wildlife conflicts, we should focus management efforts on issues that provide the greatest benefit to agricultural commodities in California. This survey provides quantitative data on research needs to better guide future efforts in developing more effective, practical and appropriate methods for managing these species. We found that ground squirrels, pocket gophers, birds, wild pigs, coyotes and voles were the most common agricultural wildlife pest species in California. The damage caused by these species could be quite high, but varied by agricultural commodity. For most species, common forms of damage included loss of crop production and direct death of the plant, although livestock depredation was the greatest concern for coyotes. Control methods used most frequently and those deemed most effective varied by pest species, although greater advancements in control methods were listed as a top research priority for all species. Collectively, the use of toxicants, biocontrol and trapping were the most preferred methods for control, but this varied by species. In general, integrated pest management practices were used to control wildlife pests, with a special preference for those approaches that were efficacious and quick and inexpensive to apply. This information and survey design should be useful in establishing research and management priorities for wildlife pest species in California and other similar regions.

Rodenticide grain bait ingredient acceptance by Norway rats (Rattus norvegicus), California ground squirrels (Spermophilus beecheyi) and pocket gophers (Thomomys bottae).

Vertebrate pest control in California is often accomplished through the use of rodenticide grain baits. These grain baits are composed of steam-rolled oats (SRO), a toxicant, an indicator dye and an oil combination. A series of tests were performed to determine the effects of various dye and oil formulations on acceptance of grain bait by Norway rats [Rattus norvegicus (Berk)], California ground squirrels [Spermophilus beecheyi (Richardson)] and pocket gophers (Thomomys bottae Eyd & Gerv). Seven different dyes, four oil formulations and clean (untreated) oats were tested for acceptance. The addition of the selected oils and dyes to grain resulted in no significant differences in consumption. This indicates that there is a wide variety of dyes that could be used in the formulation of rodenticides. These alternatives could aid in proper pesticide use, the deterrence of bait consumption by birds and possibly in ingredient adhesion to the finished bait.

Effect of diphacinone on blood coagulation in Spermophilus beecheyi as a basis for determining optimal timing of field bait applications.

The effect was determined of a single dose of 2 mg kg-1 diphacinone on three blood-clotting parameters [Prothrombin Time (PT), Partial Thromboplastin Time (PTT), and Protein Induced by Vitamin K Absence or Antagonists (PIVKA)] over a 120-h period in California ground squirrels, Spermophilus beecheyi. Diphacinone resulted in elevated PT, PTT and PIVKA within 24 h of squirrels receiving the dose. The most significant change was observed 72 h after dosing. As time following diphacinone dosing increased, there was higher individual variation in blood-clotting time. We suggest that increasing the interval between field bait applications should still result in squirrel mortality but reduce the potential for secondary hazards that may occur when squirrels have the opportunity to consume more than one lethal dose of diphacinone.

Color M-mode Doppler flow propagation velocity is a relatively preload-independent index of left ventricular filling.

Standard Doppler indexes of transmitral filling vary in response to alterations in left ventricular (LV) relaxation or preload. To determine whether color M-mode Doppler flow propagation velocity (vp), a new index of LV relaxation, is affected by preload, we obtained LV volumes, standard Doppler filling indexes, and vp in 20 patients at baseline, during Trendelenburg's position, inverse Trendelenburg's position, and after inhalation of amyl nitrite. LV end-diastolic volume decreased from 111 +/- 41 mL at baseline and 116 +/- 43 mL during Trendelenburg's position, to 104 +/- 40 during inverse Trendelenburg's maneuver and 92 +/- 33 mL after inhalation of amyl nitrite (P <.0001). Peak early filling velocity decreased from 79 +/- 19 cm/s and 90 +/- 20 cm/s to 73 +/- 22 cm/s and 64 +/- 20 cm/s, respectively (P < 0.0001). In contrast, no significant changes were found in vp (48 +/- 24 and 50 +/- 26 cm/s vs 48 +/- 25 and 48 +/- 25 cm/s). We conclude that vp is not affected significantly by preload. Thus vp may provide a more reliable and independent assessment of LV relaxation.

Telling it to Studs Terkel: HMPRG at age five.

After five years, the Health and Medicine Policy Research Group, out of generosity or vain-glory, has come to believe that its health policy interventions are a moveable feast. In what follows, the nation's premier interviewer extracts from three HMPRG stalwarts the history and the style of work which, up to this moment, has proven remarkably productive for us. Please presume this interview is an invitation to readers wherever you may be to inquire and seek counsel about how what we have been able to do might be replicated in your city. The interview was aired on WFMT's Studs Terkel Program of January 6, 1986. Patricia Terrell, Executive Director of HMPRG, John McKnight, Professor of Urban Policy at Northwestern University and a co-founder of the group, and Quentin Young, former Medical Director of Cook County Hospital and President of HMPRG, answered, as best they could, Studs Terkel's interrogatories.

Beyond the categories: human service managers view the new federal aid.

Social agency chief executives in six program areas--welfare, health, mental health, community action, model cities, and community mental health centers--were surveyed to determine their reaction to the recent revenue sharing/block grant efforts to decentralize the federal aid system. Despite their strong belief that social initiatives and values were advanced principally by federal action, and that excessive reliance on state and local officials could severely jeopardize social programs with weak constituencies, agency executives also recognized major weaknesses in traditional categorical grant policy and, to varying degrees, supported revenue sharing and block grant alternatives. Those agencies largely dependent on federal support for their survival--model cities, community action programs, and community mental health centers--tended to support the new aid efforts only reluctantly. Those agencies more fully integrated into the regular policy-making arrangements of local government--health, welfare, and mental health agencies--were considerably more positive in their endorsement of greater decentralization.