A Study On Controlling Techniques Of Lymantria Dispar L.

The gypsy motti(Lymantria dispar L.) is a worldwide pest, which has many characteristics, such as wide distribution, mixed food, heavy damage, moving along with wind, long periodicity. In recent years, it's rampancy has caused very heavy disaster in larch forest(Larix gmelinii Rupr.) of Daxing'anling mountain, Inner Mongolia. The area which is influenced by the gypsy moth is over 70,000 hm2. In order to control the spreading of the gypsy moth and reduce the harm to forest, the biological characteristic and the life history of the gypsy moth were studied. The results show: The gypsy moth reproduce one generation per year in this area, and live through the winter in the state of completing embryo up growth's larva The age of larva's one x rvwx three> foia\ five, six, experienced 7d, 14d, 12d> 6d> 8d> lOd, respectively. The time that from the larva's age of sk to pupating, from pupa to imago eclosion, from imago eclosion to spawning last 7d ,4d and Id, respectively. Also the index of prevention and cure of the gypsy moth in the condition of varied density of forest were studied, when forest density is 0.9, the index of prevention and cure of the gypsy moth is 86.7 per individual plant, while forest density is 0.8, the index is 94.8 per individual plant. Species of the natural enemy and the dominant factor of the natural enemy of the gypsy moth in the northeast of china and the district of Inner Mongolia were investigated, totally sixty species of natural enemies of the gypsy moth among them, the dominant natural enemy is fly. The comprehensive method to prevent and cure the pest were suggested, when the gypsy moth is rampancing, chemical medicament can be used as main way in emergency, how ever the smoke agent is best, it's effect of prevention and cure is between 74% and 84%. Widely developing biology prevention and cure, using the gypsy moth NPV control the larva of gypsy moth, it's effect can reach above 70%, and it can easily form epidemic, then it will have the effect of long period's controlling; using Bt control the gypsy moth, it's effect can reach above 80%; using the gypsy moth Grplure can also gain certain effect; firstly using self-produced plant insecticide control the gypsy moth, it's controlling effect of origin liquid can reach 82.3%, and has widely using foreground. The species' density of the gypsy moth will be controlled under economic permitted level.