COMMODITY TREATMENT AND QUARANTINE ENTOMOLOGY Low Temperature Phosphine Fumigation for Postharvest Control of Western Flower Thrips (Thysanoptera: Thripidae) on Lettuce, Broccoli, Asparagus, and Strawberry
نویسنده
چکیده
U.S. exported lettuce, broccoli, asparagus, and strawberries oftenharborwesternßower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), a quarantined pest in Taiwan, and therefore require quarantine treatment. Fumigation with diluted pure phosphine at a low temperatureof 2 Cwas studied to controlwesternßower thrips and todetermineeffects on thequality of the treated products. Total thrips control was achieved in 18-h fumigation treatments with 250 ppm phosphine. One day fumigation treatment with 1,000 ppm phosphine was tested on lettuce and broccoli. One-day fumigation treatments with 500 ppm and 1,000 ppm phosphine were tested on asparagus and strawberry. Visual quality of lettuce, broccoli, and asparagus was evaluated after 2-wk posttreatment storage. Strawberry quality was evaluated immediately after fumigation and after 1-wk posttreatment storage. For all the products, there were no signiÞcant differences between the treatments and thecontrols inpostharvest quality, and therewereno injuries causedby the fumigation treatments. Therefore, phosphine fumigation at low temperature was promising for postharvest control of western ßower thrips on lettuce, broccoli, asparagus, and strawberry.
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