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Studies On The Susceptibility Of Pear Trees To Pear Psylla Psylla Pyricola Foerster Homoptera
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Book Synopsis Studies on the Susceptibility of Pear Trees to Pear Psylla, Psylla Pyricola Foerster (Homoptera by : Juan F. F. Chang
Download or read book Studies on the Susceptibility of Pear Trees to Pear Psylla, Psylla Pyricola Foerster (Homoptera written by Juan F. F. Chang and published by . This book was released on 1977 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Bibliography of Psylla (Homoptera: Psyllidae) on Pear Trees by :
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:
Book Synopsis A Bibliography of Psylla (Homoptera: Psyllidae) on Pear Trees by : G. J. Fields
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:
Book Synopsis Susceptibility to Dust and Spray Mixtures of the Pear Psylla (Psylla Pyricola Förster) by : Frederick Zeller Hartzell
Download or read book Susceptibility to Dust and Spray Mixtures of the Pear Psylla (Psylla Pyricola Förster) 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:
Book Synopsis An Analysis of Pear Psylla Populations 1977-79 by : Robert Eaton Fye
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:
Book Synopsis Distribution of Pear Psylla, Psylla Pyricola Foerster, and Honeydew in Bartlett Pear Trees by : Martin George Kers
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:
Book Synopsis The Pear-tree Psylla by : Mark Vernon Slingerland
Download or read book The Pear-tree Psylla written by Mark Vernon Slingerland and published by . This book was released on 1892 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of the Possible Role of Predaceous Ants in the Management of Pear Psylla, Cacopsylla Pyricola (Foerster) (Homoptera:Psyllidae) by : Gregory Stephen Paulson
Download or read book Evaluation of the Possible Role of Predaceous Ants in the Management of Pear Psylla, Cacopsylla Pyricola (Foerster) (Homoptera:Psyllidae) written by Gregory Stephen Paulson and published by . This book was released on 1990 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory and Field Studies on the Seasonal Forms of Pear Psylla, Psylla Pyricola Förster, in Northern California by : Tim Tun Yuey Wong
Download or read book Laboratory and Field Studies on the Seasonal Forms of Pear Psylla, Psylla Pyricola Förster, in Northern California written by Tim Tun Yuey Wong and published by . This book was released on 1966 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Tree Nitrogen on Pear Psylla, Psylla Pyricola Foerster by : Douglas Goode Pfeiffer
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:
Book Synopsis The Pear Psylla and the New York Plum Scale by : Mark Vernon Slingerland
Download or read book The Pear Psylla and the New York Plum Scale written by Mark Vernon Slingerland and published by . This book was released on 1896 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pear Psylla Integrated Pest Management by : Louis Nottingham
Download or read book Pear Psylla Integrated Pest Management written by Louis Nottingham and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pear psylla (Cacopsylla pyricola [Foerster] [Hemiptera: Psyllidae]) is an important pest of pear in Washington. Honeydew produced by pear psylla causes fruit russet, and serious infestations can stunt and defoliate trees. Pear psylla likely arrived in the United States along with shipments of pear nursery stock from western Europe. It was first found in Connecticut in 1832 and spread to Washington State by 1939. Within a few years it became a serious pest throughout all pear growing areas in the Pacific Northwest.
Book Synopsis Susceptibility to Spraying Mixtures of Hibernating Pear Psylla Adults and Their Eggs by : Harold Edward Hodgkiss
Download or read book Susceptibility to Spraying Mixtures of Hibernating Pear Psylla Adults and Their Eggs written by Harold Edward Hodgkiss and published by . This book was released on 1914 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 1978 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliographies and Literature of Agriculture by :
Download or read book Bibliographies and Literature of Agriculture written by and published by . This book was released on 1981 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Selective Bibliography on Insects Causing Wood Defects in Living Eastern Hardwood Trees by : C. John Hay
Download or read book A Selective Bibliography on Insects Causing Wood Defects in Living Eastern Hardwood Trees written by C. John Hay and published by . This book was released on 1981 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monitoring Pesticide Resistance in Psylla Pyricola Foerster from Western Oregon Pear Orchards by : Peter A. Follett
Download or read book Monitoring Pesticide Resistance in Psylla Pyricola Foerster from Western Oregon Pear Orchards written by Peter A. Follett and published by . This book was released on 1984 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modified slide-dip bioassay was used to survey and establish baseline resistance levels in Psylla pyricola Foerster from western Oregon orchards to four pesticides. Orchards selected in the Hood River, Rogue River and Willamette Valleys spanned a wide range of environmental and management conditions. During the study period of 1982-1983, management conditions present at these sites included intensively sprayed, minimally sprayed (IPM), recently abandoned, and long abandoned orchards. Lethal concentration (LC50) values determined for psylla populations ranged from 0.31-12.64 g AI/1 for azinphosmethyl, 0.14-1.73 g AI/1 for endosulfan, 0.02-0.10 ml AI/1 for fenvalerate, and 0.41-1.52 ml AI/1 for Perthane. Pear psylla from all orchards showed some level of resistance to azinphosmethyl (12- to 41-fold) and endosulfan (2- to 12-fold) when compared to the susceptible OSU Entomology Farm strain. Comparative differences in susceptibility among populations to fenvalerate and Perthane, calculated by comparing each strain to the most suceptible strain, were between 1- and 5-fold. Resistance was not correlated with insecticide usage in individual orchards in the Hood River and Rogue River Valleys, where commercial pear production is intensive. Psylla from unmanaged orchards had similar or slightly higher LC50 values than managed trees for each compound. In contrast, in the Willamette Valley, where pear production is much less intensive and orchards are widely scattered, psylla resistance levels were better correlated with local insecticide usage patterns. Pairwise comparisons of mean LC50 values for a region indicated that psylla resistance levels were significantly different at the regional level for azinphosmethyl and endosulfan. The mean LC50 value for Rogue River Valley populations to azinphosmethyl of 9.00 g AI/1 was significantly higher (p
