A seed midge pest of big bluestem

A Cecidomyiid midge reared from the panicles of big bluestem (Andropogon gerardii Vitman (var. gerardii) at Mead, Neb., was identified as Contrarinia wattsi Gagne. This midge was previously known only from panicles of little bluestem (Schizachyrium scoparium (Michx.) Nash) in New Mexico. In Nebraska, C. wattsi appears to have a minimum of 3 generations per season. Larvae of the earlier generations leave the florets after completing development, making it difficult to associate floret damage with the midge. Larvae of the last generation of a season remain in diapause, in the floret, throughout the winter. Evidence obtained in this study in 1985 indicates that, at harvest time, 7 and 15% of the florets in the 2 fields studied contained diapausing midges. However, when an estimate of seed loss by the earlier generations (as indicated by empty florets and small seed) was considered, the total loss was probably closer to 40%. An unidentified species of thrips (Thysanoptera: Thripidae) also was found in big bluestem florets during this study. However, evidence suggests that thrips do not damage big bluestem seed as seriously as the midge

Materials science and engineering

xxiii, 885 hlm. : ilus. ; tab. ; 26 cm

Materials science and engineering

xxiii,122 p. : il.; 28 c

Material Science and Engineering

Xxiii.; 960 hal.;ill.; 14x21 c

A seed midge pest of big bluestem

A Cecidomyiid midge reared from the panicles of big bluestem (Andropogon gerardii Vitman (var. gerardii) at Mead, Neb., was identified as Contrarinia wattsi Gagne. This midge was previously known only from panicles of little bluestem (Schizachyrium scoparium (Michx.) Nash) in New Mexico. In Nebraska, C. wattsi appears to have a minimum of 3 generations per season. Larvae of the earlier generations leave the florets after completing development, making it difficult to associate floret damage with the midge. Larvae of the last generation of a season remain in diapause, in the floret, throughout the winter. Evidence obtained in this study in 1985 indicates that, at harvest time, 7 and 15% of the florets in the 2 fields studied contained diapausing midges. However, when an estimate of seed loss by the earlier generations (as indicated by empty florets and small seed) was considered, the total loss was probably closer to 40%. An unidentified species of thrips (Thysanoptera: Thripidae) also was found in big bluestem florets during this study. However, evidence suggests that thrips do not damage big bluestem seed as seriously as the midge

Materials science and engineering. Ninth edition

Hoboken, NJxxiii, 905 p.: app., gloss., index; 25 c

Materials Science and Engineering: An Introduction -9/E.

Building on the extraordinary success of eight best-selling editions, Callister\u27s new Ninth Edition of Materials Science and Engineering continues to promote student understanding of the three primary types of materials (metals, ceramics, and polymers) and composites, as well as the relationships that exist between the structural elements of materials and their properties

Materials Science and Engineering SI Version, -8/E.

Building on the extraordinary success of seven best-selling editions, Bill Callister\u27s new Eighth Edition of MATERIALS SCIENCE AND ENGINEERING continues to promote student understanding of the three primary types of materials (metals, ceramics, and polymers) and composites, as well as the relationships that exist between the structural elements of materials and their properties. Supported by WileyPLUS, an integrated online learning environment containing the highly respected Virtual Materials Science and Engineering Lab (VMSE), a materials property database referenced to problems in the text, and new modules in tensile testing, diffusion, and solid solutions (all referenced to problems in the text) List of Symbols. Table of Contents 1. Introduction. 2. Atomic Structure and Interatomic Bonding. 3. The Structure of Crystalline Solids. 4. Imperfections in Solids. 5. Diffusion. 6. Mechanical Properties of Metals. 7. Dislocations and Strengthening Mechanisms. 8. Failure. 9. Phase Diagrams. 10. Phase Transformations in Metals: Development of Microstructure and Alteration of Mechanical Properties. 11. Applications and Processing of Metal Alloys. 12. Structures and Properties of Ceramics. 13. Applications and Processing of Ceramics. 14. Polymer Structures. 15. Characteristics, Applications, and Processing of Polymers. 16. Composites. 17. Corrosion and Degradation of Materials. 18. Electrical Properties. 19. Thermal Properties. 20. Magnetic Properties. 21. Optical Properties. 22. Economic, Environmental, and Societal Issues in Materials Science and Engineering

Fundamentals of Materials Science and Engineering An Integrated Approach -4/E.

"Fundamentals of Materials Science and Engineering 4th Edition" continues to take the integrated approach to the organization of topics. That is, one specific structure, characteristic, or property type at a time is discussed for all three basic material types: metals, ceramics, and polymeric materials. This order of presentation allows for the early introduction of non-metals and supports the engineer\u27s role in choosing materials based upon their characteristics. Also discussed are new, cutting-edge materials. Using clear, concise terminology that is familiar to students, "Fundamentals "presents material at an appropriate level for both student comprehension and instructors who may not have a materials background