Post-Attack Injection of Silvisar 510 (Cacodylic Acid) in Spruce Beetle (Coleoptera: Scolytidae) Infested Trees

Abstract

Can. Ent. 109: 1221-1225 (1977) Post-attack injections of full-and half-strength Silvisar 510 (cacodylic acid) appear to inhibit populations of Dendroctonus rufipennis (Kirby) more effectively than quarter-and tenthstrength dilutions. Arsenic concentrations in the phloem were highest in the full-strength treatments and progressively decreased in the lesser strength treatments. Arsenic concentrations in the phloem were generally highest just above the frill while concentrations at 20 ft and higher above the frill were significantly lower than those just above the frill. Arsenic concentrations in the needles were highest in the full-and half-strength treatments and decreased progressively in the lesser strength treatments. Concentrations in the needles were essentially equal in the upper and lower portions of the crown. Arsenic concentrations in the soil were not affected by the treatments.

EFFECTS OF SEMIOCHEMICAL BAITING ON THE ATTRACTIVENESS OF FELLED AND UNFELLED LETHAL TRAP TREES FOR SPRUCE BEETLE, DENDROCTONUS RUFIPENNIS (KIRBY) (COLEOPTERA: SCOLYTIDAE), MANAGEMENT IN AREAS OF HIGH AND LOW BEETLE POPULATIONS

“…Within the notfelled subgroup, relationships of both baited and not-baited treatments displayed a significant (p = 0.0001) negative slope. Decreasing attack level with increasing height on standing trees is in agreement with Knight (1960) and Frye et al (1977). The significant difference (p = 0.01) between the negative slopes of the attack x distance relationship in the baited (b = -2.19) and the not-baited treatment (b = -0.45) suggests that baiting produced higher attack densities by promoting greater attack in the vicinity of the bait.…”

A 3,000-yr high-resolution reconstruction of forest disturbances in the Cascade Range, Oregon

“…Unfavourable conditions during this short window, such as heavy rainfall, can lead to interrupted flight patterns, and the subsequent incorporation of beetle remains within depositional environments (Brunelle et al, 2008). For example, the 1949 spruce beetle epidemic on the White River Plateau, Colorado, coincided with the wettest June on record (NCDC, 2010), resulting in an accumulation of adult beetle carcasses six inches deep, six feet wide, and more than a mile along the eastern shore of Trappers Lake (Frye et al, 1977;Morris et al, 2010).…”

“…As such large masses of bark beetles outside of the safety of the host tree is likely a rare occurrence. This may explain why examples of intact adult bark beetle accumulations within lake sediments are rare (Sturtevent, et al 2013;Morris et al, 2015;Schmid and Frye, 1977). In comparison, budworms spend their life history feeding on external plant tissues (needles, cones, and seeds).…”