The effect of feeding behavior of Monochamus alternatus (Coleoptera: Cerambycidae) on the departure of pine wood nematode, Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae)

In order to study the causes of pine wood nematode (PWN) departure from Monochamus alternatus, the effects of the feeding behavior of M. alternatus on the start date of departureof PWN were studied. The start date of the departure of PWN carried by the directly fed M. alternatus was 5-13 d after beetle emergence, mainly concentrated within 6-10 d, with a mean (±SD) of 8.02 ±1.96 d. The start date of the departure of PWN carried by the M. alternatus fed after starvation was 5-14 d after beetle emergence, mainly concentrated within 6-9 d, with a mean of 7.76 ±2.28 d. The results show that there was no significant difference in the start departure date of PWN between the two treatments. This show that the feeding behavior, subsequent metabolic changes caused by feeding behavior of M. alternatus and pine volatiles were not the triggers for PWN departure. At the same time, it was found that the motility of the PWN carried by M. alternatus at 8 d after emergence was significantly greater than that of the PWN carried by the newly emerged M. alternatus. And the PWN carried by M. alternatus at 8 d after emergence more easily extracted than the PWN carried by newly emerged beetles. Greater motility PWN were easier departure from M. alternatus.