Contact Toxicity of 17 Insecticides Applied Topically to Adult Bark Beetles PDF Download
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Author: Robert L. Lyon
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 4
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Author: Robert L. Lyon
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 4
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Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 208
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Author: Richard Harrison Smith
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 12
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Book Description
Residual effectiveness of nine insecticides applied to bark was tested against western, mountain, and Jeffrey pine beetles. Ponderosa and Jeffrey pine trees were treated and logs cut from them 2 to 13 months later, and bioassayed with the three beetles. The insecticides were sprayed at the rate of 1 gal (3.8 l) per 40- or 80-ft2 (3.6 or 7.2 m2) bark surface at varying concentrations. Effectiveness of treatment was based on reduction in length of egg galleries 2 to 3 weeks after initiating bioassay. All chemicals were quite effective for 2 to 13 months, except for malathion and Imidan which were relatively ineffective, depending largely on concentration and application rate. On the basis of equivalent amounts of lindane, the ranking ofeffectiveness ofinsecticides tested was as follows: (a) on western pine beetle: decamethrin> permethrin> lindane> Reldan> Dursban Sumithion> Sevin; (b) on mountain pine beetle: decamethrin> permethrin> lindane> Dursban Reldan> Sevin> Sumithion; (c) on Jeffrey pine beetle: decamethrin> permethrin> lindane> Sevin. The residual effectiveness of lindane was about doubled by adding 2 percent molasses, and high pH of water reduced effectiveness of Sevin. Other application parameters had little effect.
Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 596
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 4
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Author: Philip M. McDonald
Publisher:
ISBN:
Category : Clearcutting
Languages : en
Pages : 796
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Book Description
In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 490
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Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 72
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Author:
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 36
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Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 262
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