Biological Control of Pinewood Wilting Nematode (Bursaphelenchus xylophilis) by exterminating Monochamus alternatus has been successfully pioneered by scientists from Institute of Forestry Ecology, Environment and Protection (IFEEP), Chinese Academy of Forestry. It has been the first innovative and practical pest control by biological approach reported.
The newly studied technique has got hold of the vulnerabilities of different instars of Monochamus alternatus and taken pertinent countermeasures to cut off their spread chain. The biological control and pollution-free approach can control the spread of pests and guarantee the security of Eco environment and the stable biodiversity. The specifics of this biological technique consist of the procedures of: when Monochamus alternatus are at the adult stage, the researchers used their invented black light trapper to attract imagines and released Scleroderma guani when Monochamus alternatus are at the stage of 1-3 larval ages. To those 3-age callow adults and mature larvas and pupas, Dastarcus helophoroides and the eggs will be released in addition to stack the trapping wood to attract the Monochamus alternatus to spawn on the trapping wood and being treated later.
Monochamus alternatus in the dead trees, from clearing the forest sites, is made use of to breed Dastarcus helophoroides by net mats, the natural enemy of Monochamus alternatus, in an effort to increase the population quantity of natural enemies in the forest stand.
The said biological control technique has a few advantages of: First, no chemical agent will be applied, so the safety of environment for people always bears the rationale of eco protection. Second, simple handling and low cost. It is favorable to disseminate since the stacking of attractant woods or release of natural enemies are ease to manage. Third, notable results obtained by this biological control technique with the evidence that Monochamus alternatus population have been controlled under the low density on the long-time basis. Therefore, the technique provides effective as well as prolonged and continuous control of Pinewood Wilting Nematode.
The results of over ten years research and experiment in the Pinewood Wilting Nematode affected forest areas has shown the sharp contrast of before and after the application of biological control. There has been 97.7% decrease of dead trees caused by the Pinewood Wilting Nematode and the number of the Monochamus alternatus decreased by 97.1% . While in the contrast areas, there has been 90.7% increase of dead trees caused by the Pinewood Wilting Nematode and an increase of 133.3% the numbers of Monochamus alternatus. Up to date, three natural enemy multiplication breeding centers have been established.
Pinewood Wilting Nematode is the destructive pest to the pine trees, native to North America. It was first found in 1982 in China and has become the most severe damaging pest to the forest in China. Monochamus alternatus is deemed as the primary spread insects.