Archive image from page 33 of The Dalles pocket gopher and. The Dalles pocket gopher and its influence on forage production of Oregon mountain meadows dallespocketgoph884moor Year: 1951 32 CIRCULAR 884, U. S. DEPARTMENT OF AGRICULTURE Figure 15.—How to use runway probe: A, Right way, forcing probe into main run- way just deep enough to make an opening and to avoid punching a hole in the floor: B. wrong way, placing bait in a side runway; (.. placing bait correctly. COST AND RETURNS FROM CONTROL A measure of the value of pocket gopher control as a range-improve- ment practice is obtained b
Archive image from page 33 of The Dalles pocket gopher and. The Dalles pocket gopher and its influence on forage production of Oregon mountain meadows dallespocketgoph884moor Year: 1951 32 CIRCULAR 884, U. S. DEPARTMENT OF AGRICULTURE Figure 15.—How to use runway probe: A, Right way, forcing probe into main run- way just deep enough to make an opening and to avoid punching a hole in the floor: B. wrong way, placing bait in a side runway; (.. placing bait correctly. COST AND RETURNS FROM CONTROL A measure of the value of pocket gopher control as a range-improve- ment practice is obtained by comparing the cost of control with the value of the increased forage yield. The results obtained in this study, in which plots were maintained virtually 100 percent gopher-free by treatment twice each year, and by trapping to remove persistent indi- viduals, are not entirely comparable to results that would be obtained from gopher-control projects. They do serve, however, as a guide to what can be expected from control measures. Control on a project basis, with an efficient crew and thorough treat- ment of an area, should give at least a 90-percent kill of gophers. This should be followed by maintenance treatment each year, at about 10 percent of the cost of the first treatment, until the effect of the gopher is overcome. Obviously, poisoning an area and then allowing repopulation of the gophers by failing to carry out any subsequent measures would not be effective control. Recent estimates of costs for large-scale gopher control projects are not available, because there have been none since World War II. Based on records of earlier projects, present costs of control in the most acces- sible areas having moderate gopher populations are estimated to be about 40 cents per acre. However, costs vary considerably between areas because of such factors as accessibility and population density. Under heavy infestation and other conditions, costs may be increased several times.
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Keywords: 1950, 1951, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, drawing, forage_plants_oregon, historical, history, illustration, image, moore_a_w_albert_watts_1897_, page, picture, pocket_gophers_oregon, print, reference, reid_elbert_hann_1912_, vintage, washington_d_c_u_s_dept_of_agriculture
