IntensIve sIlvIculture - Forest Science Labs - Research Network ...

595. Sumaryono and G. Crabtree. 1989. Differential tolerance of woody nursery crop seedlings to
napropamide. Weed-Technology 3(4): 584-589.
Keywords: nursery operations
release treatments
chemical release
tree/stand health
261
Abstract: Field studies at Corvallis, Oregon and greenhouse experiments were conducted to
evaluate the tolerance to napropamide of black locust (Robinia pseudoacacia), honeylocust
(Gleditsia triacanthos), apple, Douglas fir (Pseudotsuga menziesii), ponderosa pine (Pinus
ponderosa) and Japanese black pine (Pinus thunbergii) in the seedling stage. Deciduous species
were more susceptible to napropamide than coniferous species. Apple had the slowest seed
germination and root development and was more susceptible. The deciduous species had more
secondary roots in the shallow soil layer which contained most of the herbicide than the
coniferous species. The roots of all woody species tested in vitro were inhibited significantly by
contact with the herbicide, but only shoot growth of apple and black locust was inhibited. Injury
to woody nursery crop seedlings may be avoided by delaying herbicide application.
596. Summers, D. and G.E. Miller. 1986. Experience with systemic insecticides for control of cone
and seed insects in Douglas-fir seed orchards in coastal British Columbia, Canada. In Proceedings
of the 2nd Conference of the Cone and Seed Insects Working Party, Station de Zoologie
Forestiere, Olivet, France, September 3-5, 1986. Ed. A. Roques. pp. 267-283.
Keywords: seed orchard management
tree/stand protection
tree/stand health
reproduction
stand conditions
Abstract: Three systemic insecticides were screened experimentally, and 2 of them used
operationally, against cone and seed insects (especially Contarinia oregonensis, Megastigmus
spermotrophus and Barbara colfaxiana), in seed orchards of Douglas fir [Pseudotsuga menziesii]
on Vancouver I., British Columbia. Dimethoate, as a foliar spray, controlled the pests and
increased the number of filled seeds per cone, making it the recommended choice. Oxydemetonmethyl,
as a foliar spray, was as effective as dimethoate in controlling the insects but appeared
less effective in increasing the number of filled seeds. Injections of oxydemeton-methyl were less
effective than foliar sprays in controlling insect damage. Acephate as a foliar spray was
inconsistent in the level of pest control achieved and as an injection gave poor results; its use was
also associated with the development of serious outbreaks of Adelges cooleyi [Gilletteella
cooleyi].
597. Summers, D. and D.S. Ruth. 1987. Effect of diatomaceous earth, malathion, dimethoate and
permethrin on Leptoglossus occidentalis (Hemiptera: Coreidae): a pest of conifer seed. Journalof-the-Entomological-Society-of-British-Columbia
84: 33-38.
Keywords: tree/stand protection
stand conditions
Abstract: Field and laboratory studies were carried out in British Columbia in 1986 to test
the efficacy of some insecticides against Leptoglossus occidentalis attacking Douglas fir