STUDY ON THE UTILIZATION OF TRICHOG RAMMA DENDROLIMI TO CONTROL THE MASSON PINE MOTH DENDROLIMUS PUNCTATUS AT LONGSHAN FOREST FARM
- Received Date: 1989-03-03
- Available Online: 2012-12-04
Abstract: This paper deals with the effectiveness of release of T. dendrolimi to control the masson pine moth D. punctatus at Longshan Forest Farm, Zhejiang Province. The results are as follows:1.If the release of wasps was conducted at an amount of 200000 heads per mu, the parasitism could reach 60%~89%.2.The best stage for release is that when the moth is at the preliminary or prodromal stage with an amount of egg masses no more than 0.5~1.5 masses per tree or 125~375 eggs per tree. The best time for release is that when the moth's adults first appear in the light trap, thus, the wasps can reproduce for 2~3 generations during the egg stage of first generation of the moth.3.Through the release experiments, we found that the keys to raise the effectiveness of release are the selection of fine mother wasps, control of over-parasitism in the parasitized eggs, change of light and temperature during the breeding peroid and correctness of calculation of the total of effective temperature.