Population Dynamics of the Onion Thrips, Thrips Tabaci Lind., on Onions
Author: Solomon Quatekwei Quartey
Publisher:
Published: 1982
Total Pages: 438
ISBN-13:
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Author: Solomon Quatekwei Quartey
Publisher:
Published: 1982
Total Pages: 438
ISBN-13:
DOWNLOAD EBOOKAuthor: Rita Kuukuwa Lloyd-Mills
Publisher:
Published: 2011
Total Pages: 112
ISBN-13:
DOWNLOAD EBOOKAuthor: Jody Lynn Gangloff
Publisher:
Published: 1999
Total Pages: 144
ISBN-13: 9780599413269
DOWNLOAD EBOOKThe onion thrips, Thrips tabaci Lindeman (Thysanoptera: Thripidae) is a worldwide pest of onions and other crops. In New York it is an annual threat to the commercial onion industry where populations are managed with regular applications of insecticides. Two peaks of flight activity occurred during the period when T. tabaci infest onions in New York. These flights were composed of both female and males of this species, as well as a smaller number of other species. On-plant populations consisted of both female and male T. tabaci but no other species of thrips. Numbers of thrips on onion plants increased steadily through the growing season, exceeding the economic threshold of three thrips per leaf by mid to late summer in most fields. During the period of population increase, and especially during peaks of flight activity, airborne thrips were captured in equal numbers on traps placed throughout onion fields. Peaks of flight activity and proportions of T. tabaci of all thrips captured in onions did not correspond with peaks, harvest or ratio of thrips captured in neighboring field and forage crops, although T. tabaci was found to be a dominant species in areas outside onion fields. Sexually reproducing strains of T. tabaci were collected from onion fields. These were found to be highly resistant to pyrethroids, including l -cyhalothrin. By contrast, T. tabaci collected in areas adjacent to onions, such as alfalfa fields, reproduced asexually and had low resistance to l -cyhalothrin. It was concluded that neighboring field and forage crops are not the most significant source of T. tabaci that invade onion fields each year and become hard to manage in New York. High levels of insecticide resistance indicate that a resistance management plan and the promotion of integrated pest management in New York's onion industry should be high priorities in the near future.
Author: Jody Lynn Gangloff-Kaufmann
Publisher:
Published: 1999
Total Pages: 262
ISBN-13:
DOWNLOAD EBOOKAuthor: Jennifer Kathleen MacIntyre Allen
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
Published: 2004
Total Pages: 239
ISBN-13: 9780612949843
DOWNLOAD EBOOKAuthor: Frank Hurlbut Chittenden
Publisher:
Published: 1919
Total Pages: 18
ISBN-13:
DOWNLOAD EBOOKAuthor: Larry Eugene Sandvol
Publisher:
Published: 1979
Total Pages: 184
ISBN-13:
DOWNLOAD EBOOKAuthor: Frank Bradshaw Maughan
Publisher:
Published: 1936
Total Pages: 338
ISBN-13:
DOWNLOAD EBOOKAuthor: Bruce L. Parker
Publisher: Springer Science & Business Media
Published: 2013-11-11
Total Pages: 606
ISBN-13: 1489914099
DOWNLOAD EBOOKThrips (fhysanoptera) are very small insects, widespread throughout the world with a preponderance of tropical species, many temperate ones, and even a few living in arctic regions. Of the approximately 5,000 species so far identified, only a few hundred are crop pests, causing serious damage or transmitting diseases to growing crops and harvestable produce in most countries. Their fringed wings confer a natural ability to disperse widely, blown by the wind. Their minute size and cryptic behavior make them difficult to detect either in the field or in fresh vegetation transported during international trade of vegetables, fruit and ornamental flowers. Many species have now spread from their original natural habitats and hosts to favorable new environments where they often reproduce rapidly to develop intense damaging infestations that are costly to control. Over the past decade there have been several spectacular examples of this. The western flower thrips has expanded its range from the North American continent to Europe, Australia and South Africa. Thrips palmi has spread from its presumed origin, the island of Sumatra, to the coast of Florida, and threatens to extend its distribution throughout North and South America. Pear thrips, a known orchard pest of Europe and the western United States and Canada has recently become a major defoliator of hardwood trees in Vermont and the neighboring states. Local outbreaks of other species are also becoming problems in field and glasshouse crops as the effectiveness of insecticides against them decline.
Author: J. Wilcox
Publisher:
Published: 1960
Total Pages: 4
ISBN-13:
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