Effectiveness of micronized fluorescent powder for marking citrus psyllid, Diaphorina citri

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  • Nakata Tadafumi
    Crop Production and Protection Group, Tropical Agriculture Research Front (TARF), Japan International Research Center for Agricultural Sciences (JIRCAS)

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Asian citrus greening disease (CGD) is caused by Candidatus Liberibacter asiaticus, transmitted by the Asian citrus psyllid, Diaphorina citri Kuwayama. An effective method for controlling the pathogen is currently unavailable; therefore, controlling psyllids is a more practical strategy for minimizing damage from CGD. However, ecological/ethological field studies on this insect are limited due to a lack of effective marking methods. This study examined the effectiveness of a marking method for psyllids using fluorescent powder (FZ-2803). Equal numbers of marked and unmarked psyllids were released at a distance of 2 m from a light. The collection of marked psyllids near the light was significantly lower than that of unmarked psyllids until 4 h after marking. After 5 h, no significant difference was observed. No significant differences in mortality were detected between the two groups during a 40-day period after marking. The persistence of a mark on the psyllid body was confirmed visually in the laboratory for 40 days. One hundred marked psyllids were released in an orange jasmine field (18 m×18 m). The marked insects were detected visually, and the proportion of marked insects was 30% after 20 days and 20% after 40 days. These results indicate that the marking method using fluorescent powder does not affect survival, and it can be used for ca. 5 weeks in the field.

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