Virus diseases of insect pests of economically important vegetable crop: Nuclear polyhedrosis virus of cabbage looper, Trichoplusia ni in Thailand
1983
Tipvadee Attathom | Pissawan Poolpol (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Entomology)
Surveys of vegetable farms from various provinces in the Central Plain area of Thailand indicated that the cabbage looper, Trichoplusia ni was the key pest of many vegetable crops especially the celery cabbage, Brassica pekinensis. Microorganism was one of the natural mortality factors leading to reduction of this pest population. The microorganism found to possess good potential to 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. The infected larvae demonstrated typical sign and symptoms of NPV infection. The larvae died within 3-5 days after infection. Polyhedra of this virus were polyhedral and near spherical in shape with mean diameter of 1.4 um. Virions and nucleocapsids were rod-shaped with mean widths and lengths of 143x338 nm and 36x250 nm, respectively. Further detail study on other characteristics, host range, mass production methodology and efficacy of this virus would undoubtedly benefit broader application of this virus for control not only the cabbage looper but also other important insect species in Noctuidae and related families as well.
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