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 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 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 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book Investigations on the Control of Pear Psylla written by Frederick George Mundinger and published by . This book was released on 1925 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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

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 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:

Download or read book Pear Psylla written by Diane G. Alston and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Some Aspects of the Ecology of the Pear Psylla written by Robert Louis Sisson and published by . This book was released on 1962 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

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 Laboratory and Field Studies on the Seasonal Forms of Pear Psylla Psylla Pyricola F rster 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:

Download or read book Pear Psylla Psylla Pyricola Foerester written by and published by . This book was released on 1978 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Pear Psylla in California written by Harold F. Madsen and published by . This book was released on 1962 with total page 20 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: