Historic, archived document Do not assume content reflects current scientific knowledge, policies, or practices. 3 Paper No. 39 ber 1958 FOREST INSECT CONDITIONS iBR em A NEW MEXICO, ARIZONA, Re Yn — ae > 4 ia) } = = = = SPO) 8 o's | Fe) Ge at 21 7 | ra oe OF = b ox : Z a 600 A¥ 700 yy ZY a 600 Y Y oO 800 ~ Uy Y ine Ha 7 : LOU and covers 2,500 acres. In 1958, two new outbreaks were dis- covered -- one 3, 000-acre area on Baker Mountain, Tonto National Forest; the other, a 12, 000-acre area on Sandia Mountain, Cibola National Forest. The two outbreaks on'the Tonto National Forest are about 40 miles apart with 300 air-miles separating them from the Sandia Mountain outbreak. Defoliation in specific localities in the Pinal Mountain outbreaks is severe; some trees have lost all of their foliage. Feeding intensity in other areas is light to heavy. No tree mortality has resulted. During June 1958 the Forest Service sprayed about 100 acres of heavily infested white fir on Pinal Mountain. Treatment was by aerial application of 1 pound of DDT in I gallon of fuel oil. The effectiveness of the treatment was limited. Moths in the unsprayed Gee area were extremely abundant, and as a result the insect not only reinfested the control area, but caused serious damage in areas where light or no damage was anticipated. Aspen leaf roller Defoliation of aspen by the aspen leaf roller (Archips conflictana (Wlkr.)) has risen from 500 to 1, 280 acres on the Tres Piedras District, Carson National Forest. Needle miner All outbreaks of this needle miner (Recurvaria sp. ) have disappeared. The areas infested in 1956 and 1957 were ground checked and no insects were found. Sa wily There was an increase in 1958 from 640 to 1, 280 acres of ponderosa pine defoliation caused by an unidentified pine sawfly south of Grants, New Mexico. The infestation is heavy, but no tree mortality has resulted. MISCELLANEOUS PESTS Red turpentine beetle The red turpentine beetle (Dendroctonus valens Lec. ) is active in ponderosa pine severely damaged by a July hailstorm on the Mescalero Indian Reservation. Outbreaks, about 1 acre in size, are scattered throughout the hail-damaged pine. Tree killing by the beetle is expected. Prescott scale The moderate infestation of the Prescott scale (Matsucoccus vexillorum Morrison) on the North Rim of the Grand Canyon National Park remained static in 1958. Pinyon needle scale A pilot control test with three dosage rates of Malathion was conducted against the pinyon needle scale (Matsucoccus acalyptus Herbert) on the South Rim of the Grand Canyon in July 1958. Lack of data on the life history of this scale is considered chiefly respon- sible for the poor control obtained. Varying dosages of a systemic insecticide, Systox, were. applied to the base of several pinyon trees infested with the scale. Variable but unsatisfactory control was observed. The scale at Grand Canyon is light, but heavy infestations can be found on adjacent national forest land. Mites The mite infestation on Douglas-fir near Lost Lodge on the Lincoln National Forest, which began in 1956, is decreasing in intensity. Fall webworm Defoliation by the fall webworm (Hyphantria cunea Drury) increased in 1958. Cottonwoods in the Rio Grande Valley north of Santa Fe, New Mexico, and various broadleaved trees along Oak Creek Canyon in the Coconino National Forest were heavily defoliated and damaged. Walnut caterpillar An infestation of Datana sp. on Texas black walnut continues to be a problem at Carlsbad Caverns National Park. Frequent spray applications of DDT are greatly minimizing damage, but reinfestation from surrounding areas is hindering control efforts. Lacebug The unidentified lacebug that caused leaf injury to sycamore in Montezuma Castle National Monument in 1957 had apparently died out by 1958. 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