북미 수출용 과수원의 검역대상 잎응애류 발생 예찰
Monitoring of the teteranychid mites at apple and pear orchards in Gyeongbuk province export to North America
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This study was to provide basic data for the occurrence status of the tribe Tetranychini in export apple and pear orchards in Gyeongbuk province and to meet the requirements of quarantine regulations of import countries. This study was conducted to investigate Tetranychini occurrence status of the export desgnated farmhouses during 1999~2003, and the interrelation among meteorological data, pesticides application and Tetranychini occurrence. The farmhouses which were designated as Canada export groves sprayed pesticides and fungicides at the same time monthly 1~2 times to reduce labor power and expenses. Acaricides was sprayed usually 2-3 times annually in the early stage of Tetranychini occrrence. The annual occurrence quantity of Acaricides was 38.1(Yeongcheon), 29(Sangju), 23.9(Gunwi) and 10.3(Mungyeong) in 1999 but diminished to 2.4(Yeongcheon), 0.3(Sangju) and 0(Mungyeong) in 2003. The percentage of the export orchards where Tetranychini was found decreased sharply from Yeongcheon and Gunwi 100%, Sangju 69.8% and Mungyeong 87.5%(1999) to each 40%, Gunwi 30.8% and Munggyeong 0%(2003). Specially, the yearly average temperature in Yeongcheon and Sangju was higher than that of the other area, thus, the occurrence was thought to be higher because of the ecological traits of Tetranychini. In 1999, under high temperature and dry weather condition, the population of T. urticae was relatively higher compared to the other years in export orchards. The monthly occurrence quantity reached to the peak from Jun. through Aug. In all export orchards, the occurrence quantity was diminished suddenly in 2003, Tetranychini occurrence quantity was thought to decrease because of the increase of the precipitation and rainfall days during the mature stage of Tetranychini. and also due to climatic condition of low temperature and much moisture. According to the results of survey on orchard of Yeongcheon, Sangju, Gunwi, and Mungyeong in Gyeongbuk Province for 1999~2003, T. urticae seemed to be the most serious pest in pear orchards and mainly occurred in the Jun.~Aug. with a peak. P. ulmi occurred as much as T. urticae in apple orchards and collected most frequently during Aug.~Sep. The investigation shows that Tetranychini diminishing has an interrelationship with climate condition, so to control the pest, it is also important to monitor the status of Tetranychini occurrence and exact weather forecast information at the right time. Along with this, the advancement of cultivation technology and pest control method of the farmers also had a great part in managing the occurrence of the mite. Even if the chemicals used was not changed widely, when controlling the pest, it was very effective to spray the chemicals at the early stage of the occurrence. As a result of monitoring Tetranychini in export orchards (1999~2003), a farmhouse was disqualified from taking part in export program in 1999 and thereafter the advancement of cultivation technology, knowledge on weather forecast and sharing the information on the web have diminished the occurrence of the mite.