Influence of Temperature on Egg Production in Sunflower Stem Weevil \u3ci\u3eCylindrocopturus Adspersus (Coleoptera: Cucurlionidae)

Controlled laboratory experiments were conducted to study the influence of temperature on production of eggs by a sunflower stem weevil Cylindrocopturus adspersus. Maximum egg production occurred when the temperature was 30± 1°C. At 27C the rate of egg production was lower than at 30°C but significant only at the P \u3c 0.1 level. At 20, 23. and 35C egg production was significantly lower than at 30°C (P \u3c 0.05) indicating that temperature can be an important factor in regulating the fecundity of this species

Laboratory Evaluation of the Pathogenicity of \u3ci\u3eBeauveria Bassiana\u3c/i\u3e and \u3ci\u3eMetarhizium Anisopliae\u3c/i\u3e to Larvae of the Banded Sunflower Moth, \u3ci\u3eCochylis Hospes\u3c/i\u3e (Lepidoptera: Cochylidae).

Laboratory bioassays were conducted to assess the virulence of two entomopathogenic fungi, Beauveria bassiana, and Metarhizium anisopliae to 5th instars of the banded sunflower moth, Cochylis hospes,(Lepidoptera: Cochylidae). Temperature conditions of 20 and 25°C and high humidity, (near saturation) were nearly optimal for development of both fungi. Concentrations of 10(7) to 10(8) conidia/ml produced 100% mortality in 10 days or less and 106 conidia/ml produced 90% mortality at 21 to 26 days. Median lethal concentrations of conidia (LC50) from M. anisopliae were 3.6 x 103 at 25°C and 4.1 x 103 at 20°C. The LC50 for B. bassiana was 14.9 x 104 conidia/ml at 20°C and 6.7 x 103 conidia/ml at 25°C. Although B. bassiana tended to be less virulent at 20°C, these differences were not significant. The high humidities required for germination and growth may reduce the usefulness of these fungi as con­trol agents of C. hospes in the northern Great Plains. Further studies and field evaluations are needed to determine if there are microhabitats in the soil or on the sunflower head where the humidity is high enough for germination and growth of B. bassiana or M. anisopliae. Targeting of C. hospes stages in the soil to avoid contaminating the seed or oil with saprophytic fungal spores may be preferred to targeting the sunflower plant for reasons of preserving seed quality, marketing, and consumption

Partial melting of amphibolite to trondhjemite near Ykutat, Alaska

At Nunatak Fiord, 55 km NE of Yakutat, Alaska, a uniform layer of Cretaceous metabasalt approximately 3 km thick was metamorphosed to amphibolite facies and locally partially melted to trondhjemite pegmatite. Results of the rare earth element analysis performed on the amphibolite and the trondhjemite pegmatite are discussed

Oviposition by the Banded Sunflower Moth, \u3ci\u3eCochylis Hospes\u3c/i\u3e (Lepidoptera: Cochylidae) in Response to \u3ci\u3eHelianthus Annuus\u3c/i\u3e Pollen

Oviposition on an artificial substrate by the banded sunflower moth Cochylis hospes Walsingham was examined in response to sunflower pollen (Helianthus annuus) and sunflower pollen extract. Sunflower pollen in quantities as small as 0.2 mg significantly reduced oviposition on an artificial substrate relative to a control without pollen. Aqueous pollen extract applied to the artificial substrate significantly reduced oviposition with respect to the control substrate that was treated with solvent. Banded sunflower moths have gained some reproductive or competitive advantage by ovipositing on the bracts of sunflower and a deterrent effect of pollen could, at least in part, have had functional significance in the development of a behavioral preference for the bracts of the sunflower head as an oviposition site

New broad 8Be nuclear resonances

Energies, total and partial widths, and reduced width amplitudes of 8Be resonances up to an excitation energy of 26 MeV are extracted from a coupled channel analysis of experimental data. The presence of an extremely broad J^pi = 2^+ ``intruder'' resonance is confirmed, while a new 1^+ and very broad 4^+ resonance are discovered. A previously known 22 MeV 2^+ resonance is likely resolved into two resonances. The experimental J^pi T = 3^(+)? resonance at 22 MeV is determined to be 3^-0, and the experimental 1^-? (at 19 MeV) and 4^-? resonances to be isospin 0.Comment: 16 pages, LaTe

An Alternative Parameterization of R-matrix Theory

An alternative parameterization of R-matrix theory is presented which is mathematically equivalent to the standard approach, but possesses features which simplify the fitting of experimental data. In particular there are no level shifts and no boundary-condition constants which allows the positions and partial widths of an arbitrary number levels to be easily fixed in an analysis. These alternative parameters can be converted to standard R-matrix parameters by a straightforward matrix diagonalization procedure. In addition it is possible to express the collision matrix directly in terms of the alternative parameters.Comment: 8 pages; accepted for publication in Phys. Rev. C; expanded Sec. IV, added Sec. VI, added Appendix, corrected typo

Creating ultracold molecules by collisions with ultracold rare gas atoms in an optical trap

We study collisions of para-H$_2$ with five rare gas atomic species (He, Ne, Ar, Kr and Xe) over the range from 1 K to 1 $\mu$ K and evaluate the feasibility of sympathetic cooling H$_2$ with ultracold ground state rare gas atoms co-trapped within a deep optical trap. Collision cross-sections over this large temperature range show that all of these species could be used to cool H$_2$ to ultracold temperatures and that argon and helium are the most promising species for future experiments.Comment: 5 pages, 1 figure, 1 table, submitted for publicatio