Quarantine Treatments: A Biological Approach to Decision- Making for Selected Hosts of Codling Moth (Lepidoptera: Tortricidae)

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The current criterion for insect quarantine treatments in many countries is the probit 9 (i.e., 99.9968% mortality). This concept is used without due consideration for commodity infestation levels or types (multiple or solitary) or survival on the harvested commodity. Historically, probit 9 was based on security levels required for tropical fruit fly species. However, other quarantined insects such as codling moth, Cydia pomonella (L.), infest commodities at very low levels; in addition, inherent survival and reproductive potential on these commodities after harvest is quite low. When infestation levels at harvest alone are considered, several of the currently approved quarantine treatments appear to be extremely conservative based on potential for survival and reproduction. Tables are provided showing the probability of a potential mating pair of codling moths occurring in a shipment based on infestation levels, volumes shipped, as well as mortality required, if any, to maintain survival below this level. Systems approaches to quarantine include development of more quantitative biology data, modification of shipment volume, arrival times, and the distribution of the commodity upon arrival. All of these data suggest that quarantine treatment should be based on survival and that, in a number of situations, treah11ent is not needed at all.

Document Type: Research Article

Publication date: February 1, 1993

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