Nuclear Polyhedrosis Virus of Cabbage Looper, Trichoplusia ni in Thailand

Abstract

Surveys of vegetable farms from various provinces in the Central Plain area of Thaila~d indicated that the cabbage looper, Tn'choplusia ni was the key pest of many vegetable crops especially the celery cabbage, Bmssica pekinensis. Microorganism was one of the natural mortality factors leading to reduction of this pest population. The microorganism found to possess good potential for control the cabbage looper was the Nuclear polyhedrosis virus (NPV) of single embedded type. This virus infected fat tissue, hypodermis, tracheal cells, mid gut epithelial cells and hemocytes.