Download or read book Economic Injury Level of the Pear Psylla Psylla Pyricola Forster and a Discrete Time Model of a Pear Psylla predator Interaction written by Jay Finis Brunner and published by . This book was released on 1975 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Control in the Western United States written by James Robert Nechols and published by A N R Publications. This book was released on 1995 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1975 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Analysis of Pear Psylla Populations 1977 79 written by Robert Eaton Fye and published by . This book was released on 1981 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Bibliography of Psylla Homoptera Psyllidae on Pear Trees written by and published by . This book was released on 1981 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Distribution of Pear Psylla Psylla Pyricola Foerster and Honeydew in Bartlett Pear Trees written by Martin George Kers and published by . This book was released on 1983 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Susceptibility to Dust and Spray Mixtures of the Pear Psylla Psylla Pyricola F rster written by Frederick Zeller Hartzell and published by . This book was released on 1925 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Feeding Rates and Behavior for Some Predators of Two Psylla Species and a Biology of a Parasite of Psylla Pyricola F rster written by Robert Randolph Hansen and published by . This book was released on 1975 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pear Psylla Psylla Pyricola Foerster written by Canada. Department of Agriculture and published by . This book was released on 1981 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Bibliography of Psylla Homoptera Psyllidae on Pear Trees written by G. J. Fields and published by . This book was released on 1981 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pear Psylla Psylla Pyricola Forester written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Potential of Endemic Natural Enemies to Suppress Pear Psylla Cacopsylla Pyricola F rster in the Hood River Valley Oregon written by Steven R. Booth and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addressed the potential of endemic predaceous and parasitic arthropods of the Hood River Valley, Oregon to suppress the pear psylla, Cacopsylla pyricola F8rster. Natural enemies adequately suppressed psylla in three of seven unsprayed orchards of differing vegetational settings, orchard age, and size. Relatively few psylla natural enemies dispersed to unsprayed pear mini-orchards, dspite abundant populations on surrounding noncultivated vegetation. Pear psylla natural enemies were more abundant on arboreal rather than herbaceous non-pear hosts. Selective programs of pear pest control based on diflubenzuron were moderately successful in controlling the pear psylla, with natural enemies aiding in suppression in six of fourteen commercial trials of selective programs. In both unsprayed and commercial pear orchards, late-season psylla densities appeared to be best suppressed when levels of natural enemies were high during early-season. Classification analysis confirmed that orchard site, chemical regime, type (mini- or commercial), and season affected proportions of natural enemies and their pear psylla prey. Complexes of natural enemies and pear psylla immatures from commercial orchards where biological control was successfully demonstrated were taxonomically similar. Effective natural enemy complexes in commercial orchards were characterized by earwigs, lacewing larvae, and moderate proportions of pear psylla immatures during early season and Deraeocoris brevis, earwigs, and lacewings during mid-season. Plagiognathous guttatipes (Uhler) or Diaphnocoris provancheri (Burque) dominated effective natural enemy seasonal complexes at each of two mini-orchards. The functional response to pear psylla eggs was measured for five predaceous mirids. Functional response parameters differed among species and their life-stages, but all destroyed large numbers of psylla eggs. Further experimental directions for the implementation of pear psylla biological control are proposed. General investigative strategies include: (1) augment natural enemies on non-pear vegetation adjacent to the target orchard, and (2) modify the orchard habitat to both encourage natural enemy colonization and allow permanent complexes of natural enemies to develop. Specific tactics include: plant hedgerows of filbert or willow, cultivate snakeflies, introduce Anthocoris nemoralis, adjust early season psylla densities with suitable timing and kind of delayed dormant sprays, using a more effective selective psyllacide, and reduce winter pruning to allow development of natural enemies which overwinter in the egg stage.

Download or read book Host Resistance to the Pear Psylla in New York written by Marvin K. Harris and published by . This book was released on 1972 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pear Psylla Psylla Pyricola Foerster written by Canada. Agriculture Canada and published by . This book was released on 1981 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical and Behavioral Ecology of the Pear Psylla Cacopsylla Pyricola F rster Hemiptera Psyllidae written by Robert Lamarr Brown and published by . This book was released on 2008 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Tree Nitrogen on Pear Psylla Psylla Pyricola Foerster written by Douglas Goode Pfeiffer and published by . This book was released on 1982 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: