Study On Artificial Raising Technology Of Dastarcus Helophoroides

Studies showed that the larva of Dastarcus helophoroides parasite the mature larva and pupa of longicorn. In nature, Dastarcus helophoroides present some form distribution, and its spreading ability weak. Only through a large amount of artificial reproduction and releasing, spreading the distribution and increasing the population's quantity of Dastarcus helophoroides by people, we could strengthen the whole control ability to the longicorn. On the basis of the above research, this paper studied the biological characteristic, artificial diets and raising technology of Dastarcus helophoroides and drew the results as follows:1. Life history: In the laboratory, the adult breeds no more than 6 generations and 21 couples of sister generations in three years. The adults hibernate in artificial tunnels after mid October. In the early March of the next year, adults begin to active. Hibernate adults lay eggs twice in a year, egg stage is 12.7 days, larva stage is 8.4 days, and pupa stage is 25.6 days. Only some of the first sister generation adults begin to lay eggs in the early August and end in mid September. The second-generation adults emergence in late September. The second sister generation adults don't lay eggs in this year.2. Life habits: Adult's feeding habits is relatively mixed. It is good at creeping and has weak photo taxis. Usually, it is in thanatosis, and its longevity is more than 4 years. The eggs can be kept for more than 40 days in 5 refrigerator, and does not influence its normal development and hatch. The creeping ability of hatchings is strong; the straight-line distance is 5~7 centimeters per hour, and they can survive for 3~4 days in the situation without any food. The type of developing larva is like maggot. The larvae have the habit of collective feeding, only a few larvae showed cannibalism. The coons are white at the beginning. 1~2 days later, they turn into the yellow, and turn into the yellowish-brown gradually as time goes on.3. Development starting temperature and effective accumulated temperature: Development starting point temperature of egg is 13.2 0.93 , it's effective accumulated temperature is 121.7 9.58 day degree; Development starting point temperature of larva is 11.7 0.58 , it's effective accumulated temperature is 139.0 8.29 day degree; The development starting point of coons and pupa is 13.9 0.99 , it's effective accumulated temperature is 265.24 9.00 day degree.4. Study on artificial diets: Diet 5 and diet C is respectively the best diet that reared the adultand larvae of Dastarcus helophoroides in the laboratory. Hatchings of Dastarcus helophoroides can parasite the pupa of Tenebrio molitor. Dastarcus helophoroides larvae can make cocoons and pupate, but the adults can't emergence.5. Parasitic experiment of releasing Dastarcus helophoroides eggs in the laboratory : When eggs placed in the wood block, egg stage is more than 18 days, average hatching rate of eggs is 60%~72%, and average parasitic rate of hatchings parasite on the larva of Anoplophora glabripennis is more than 60%; When eggs placed out of the wood block, egg stage is 13~15days, average hatching rate and average parasite rate are increased, they are 83.3% and 87.5% respectively.