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AbstractThe pine wood nematode (PWN), Bursaphelenchus xylophilus, which in China andEast Asia is vectored by Monochamus alternatus, is the causal agent of pinewilt disease of Japanese black pine, Pinus thunbergii. The vector emergenceand the transmission of nematodes through vector feeding on pine twigs weremonitored during 2004 and 2005 in Nanjing, China. The emergence started fromlate April to the end of June and peaked from late May to early June. Therewere 438 and 927 adults collected in 2004 and 2005, respectively, andapproximately 70% of the beetles emerged during the peak period. Visualestimation of the nematode burden on vectors by observation of the atrium ofthe first abdominal spiracle gave unreliable information. The percentage ofbeetles carrying PWN of the total number of emerged beetles was between 20and 30%. Seventy percent of the nematodes were released from beetle cadaversafter 3 days of extraction. The sex and longevity of the beetle had nosignificant relationship with the number of nematodes that remained incadavers. Transmission of nematodes into pine twigs through beetle feedingstarted 10 days after emergence of the vector. The period of nematodetransmission could last for up to 79 days after beetle emergence. Two typesof nematode-transmission curve were found by measuring the number ofnematodes transmitted into pine twigs per day. The unimodal pattern peakedbetween 3 and 6 weeks after adult emergence; the bimodal pattern had twotransmission peaks: one between 2 and 3 weeks, and another between 5 to 7weeks after beetle emergence.
Nematology – Brill
Published: Jan 1, 2007
Keywords: MATURATION FEEDING; EMERGENCE; PINE WOOD NEMATODE
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