| Autor: |
Song ZJ; Institute of Equipment Technology, Chinese Academy of Inspection and Quarantine, Beijing 100123, China.; Department of Plant Biosecurity, College of Plant Protection, China Agricultural University, Beijing 100193, China.; Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China., Zhao QY; Institute of Equipment Technology, Chinese Academy of Inspection and Quarantine, Beijing 100123, China.; College of Environmental and Life Sciences, Health, Engineering and Education, Murdoch University, Perth 6150, Australia., Ma C; Division of Plant Quarantine, National Agro-Tech Extension and Service Center, Beijing 100125, China., Chen RR; Division of Plant Quarantine, National Agro-Tech Extension and Service Center, Beijing 100125, China., Ma TB; Institute of Equipment Technology, Chinese Academy of Inspection and Quarantine, Beijing 100123, China.; Department of Plant Biosecurity, College of Plant Protection, China Agricultural University, Beijing 100193, China., Li ZH; Department of Plant Biosecurity, College of Plant Protection, China Agricultural University, Beijing 100193, China., Zhan GP; Institute of Equipment Technology, Chinese Academy of Inspection and Quarantine, Beijing 100123, China. |
| Abstrakt: |
Paracoccus marginatus is a highly polyphagous invasive pest that poses a significant quarantine threat to tropical and subtropical countries. Infested commodities in international trade should undergo phytosanitary treatment, and irradiation is recommended as a viable alternative to replace methyl bromide fumigation. Dose-response tests were conducted on the 2-, 4-, and 6-day-old eggs and gravid females of P . marginatus using the X-ray radiation doses of 15-105 Gy with an interval of 15 Gy. Radiotolerance was compared using ANOVA, fiducial overlapping and lethal dose ratio (LDR) test, resulting in no significant difference among treatments, except for the overall mortality and LDR at LD 90 (a dose causing 90% mortality at 95% confidence level). The estimated dose for LD 99.9968 was 176.5-185.2 Gy, which was validated in the confirmatory tests. No nymphs emerged from a total of 60,386 gravid females exposed to a gamma radiation dose range of 146.8-185.0 Gy in the confirmatory tests. The largest dose in confirmatory tests should be the minimum threshold for phytosanitary treatment, consequently, a minimum dose of 185 Gy is recommended for the phytosanitary irradiation treatment of papaya mealybug-infested commodities, ensuring a treatment efficacy of ≥99.9950% at 95% confidence level. |
