. Champ de contrôle des rongeurs en Californie. Les Mammifères Rongeurs. Fig. 15. Utilisation de la sonde pour placer des appâts gaufre ; lorsqu'il est enfoncé dans le sol, si la sonde chute soudainement d'environ 2 pouces, un tunnel a été retrouvé ; alors le trou de sonde est faite assez grande pour insérer un appât empoisonné. cette sonde, peuvent traiter plusieurs centaines de trous, plus de 40 hectares, en un seul jour. La sonde est plus facile à utiliser lorsque le sol est humide et doux jusqu'au niveau des principaux tunnels et moins facile quand le sol est dur. Il n'est pas satisfaisante dans le sable. Dans adobe le sol qui se fissure quand sec, la sonde descend comme ea

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. Controlling field rodents in California. Mammals; Rodents. Fig. 15. Use of probe for placing pocket gopher baits; when pushed into the ground, if the probe suddenly drops about 2 inches, a main tunnel has been located; then the probe hole is made large enough to insert a poisoned bait. this probe, can treat several hundred holes, over as much as 40 acres, in a single day. The probe is easiest to use when the soil is damp and soft down to the level of the main tunnels and less easy when the ground is hard. It is unsatisfactory in sand. In adobe soil that cracks when dry, the probe drops as easily into a crack as into a burrow. In finely cultivated fields the dry surface soil should be scraped back before closing the hole, which may be done with a clod of earth. The best time to use the probe is in the fall during the first cool weather or just after the first good rains, and in the spring months. Burrows are easier to locate when the mounds are conspicuous, before green vegetation becomes tall and abundant. The land should be gone over thoroughly at this season. Alfalfa fields, due to the abundant and continuous food supply, are someties harder to treat effec- tively than orchards or open fields. Gophers are most apt to gnaw or girdle orchard trees during late summer, after the surface of the ground has become dry and green vegetation is scarce. Thus at the season when the gopher is doing the most serious damage, and speedy destruc- tion is most to be desired, the probing method is least easy, and the operator may have to dig down to the main run- ways to place poisoned baits. In a garden, nursery, or lawn where it seems desirable to use poisoned baits rather than traps, formula 5 or 6 may be employed. [32]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Storer, Tracy I. (Tracy Irwin), 1889-197

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