Exotic plant pests and North American agriculture by Charles L. Wilson

By Charles L. Wilson

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The deliberate introduction of pests into new areas is rare, but does occur (Gregory, 1979). As stated by Gregory (p. " Much of the history of past introductions and most of the reasons for quarantine are based on logic, but much of the logic is based on reasonably well-established facts. The source of pathogens and the time of their entry is logically based on their time of appearance at different places.

XI. XII. XIII. XIV. XV. XVI. XVII. XVIII. Hypothesis Logic A. Introduction of United States Food Crops B. Desirability of Introducing New Crops Plant Introduction as a Government Activity Entrance of Pathogens with Hosts Return of Native Plants from Abroad Entrance of Pathogens without Hosts Entrance of Hosts without Pathogens The Importance of Alternate Hosts The Importance of Vectors Introduction of Pathogens by Travelers Variable Host Range Chance of Establishment Changing Virulence of Pathogens Changing Susceptibility of Hosts Pathogens Introduced into the United States A.

In 1955, it moved into Texas from Mexico and was eradicated. However, it reinvaded Texas in 1969 and Florida in 1976. All infestations have been controlled by parasites introduced from India and southeast Asia. The second range extension category involving Mexico and Cuba includes species native to those countries. Many of these are immigrant only in the sense that they are tropical forms having an extreme northern range that more or less coincides with south Texas or southern Florida. In favorable years, they extend their range into the United States.

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