Striped Pine Scale Control, Midsummer Applications, Golden, Co, 1992

Abstract

Trials were conducted at a Golden, CO golt course on Scotch pine that were heavily infested with striped pine scale. Applications were made 4 Aug to point of run-off on individual infested terminal branches. Plot design was a RCB with 4 replications. At the time of treatment nymphs were in the second instar; at evaluation males were beginning to emerge. Plots were evaluated by counting the total number of nymphs on 10 needle bundles collected randomly on 10 Sep.

Effects of Horticultural Oil and Foliaror Soil-Applied Systemic Insecticides on Euonymus Scale in Pachysandra

“…We propose that failure of the compound to move out of the phloem and xylem allowed the euonymus scale to feed on subcuticular plant cells without substantial exposure to imidacloprid. This explanation is supported by the failure of soil applied imidacloprid to control armored scales on pines where control of phloem-feeding soft scales was observed (Cooper and Cranshaw 1995;Cranshaw and Cooper 1995). The 4 months that elapsed between application and the final assay is beyond the 3-month interval needed for soil applications to kill insects in mature elm tree canopies (Sclar and Cranshaw 1996).…”