新竹地區海梨柑根腐線蟲危害調查

Survey on Damage of Hai-Li Tangor Caused by Root Lesion Nematode (Pratylenchus ssp.) in Hsinchu County

調查新竹縣關西鎮、芎林鄉、新埔鎮、峨眉鄉四個鄉鎮、49處生長良好之海梨柑果園土壤中根腐線蟲（Root lesion nematode Pratylenchus spp.）族群危害情形，結果顯示無線蟲危害者僅8處，佔16.33%，其餘為極輕微危害者有41處，佔83.67%。顯示新竹地區海梨桶柑園內根腐線蟲發生比例頗高，即使在生長良好的果園中，仍有如此高比例之寄生性線蟲存在，表示其潛在性的危害極為嚴重，如不及早加以防治，可能造成嚴重損失。

A survey was conducted on damages caused by root lesion nematodes and the nematode population in 49 Hai-li tangor orchards distributed in Kunsi, Chunlin, Shinpu, and Earmay in Shiuchu in 1998 December was conducted. Results showed that root lesion nematodes were present in 83.67% of Hai-li tangor orchards and caused damages. Only t6.33% of the orchards did not find this nematode, 41 orchard (83.67%) were very slightly damaged, where the population of nematodes was less than 25 nematodes/100g soil. Up to present there is no significant symptoms of damages caused by nematodes, but the results of the survey showed that it is time to make a more intensive survey on nematode infestation in those citrus orchards and lake necessary actions to prevent nematodes causing serious damages.